subject:(Nonlinear physics)

Cornell University

1. Saha, Kasturi. Nonlinear Optics In Nanophotonic Structures.

Degree: PhD, Physics, 2014, Cornell University

► Photonic structures such as photonic bandgap fibers and high confinement nanowaveguides have proven to be excellent platforms for studying nonlinear optical interactions tailored towards applications… (more)

▼ Photonic structures such as photonic bandgap fibers and high confinement nanowaveguides have proven to be excellent platforms for studying nonlinear optical interactions tailored towards applications in spectroscopy, quantum communication, quantum computation protocols, optical clockwork and precision frequency metrology. This thesis discusses our approach towards exploiting these high confinement media for demonstrating novel few photon nonlinear optical interactions such as two-photon absorption and cross-phase modulation in hot atomic vapors (Rubidium) confined inside hollow-core photonic bandgap fibers (PBGF), generating ultra-broadband optical frequency combs that utilize cascaded parametric four-wave mixing and mode-locked femtosecond pulses in silicon nitride nanowaveguides. We generate large optical depths in such a Rb-PBGF system, and the tight light confinement, high vapor density and long interaction length allow us to perform nonlinear optics at ultralow power. We observe 25% all-optical modulation with <20 photons, i.e., a few attojoules of energy, and large cross-phase shifts of 0.3 mrad per photon with a response time <5 ns in Rb-filled PBGF. This result takes us to within an order of magnitude of single-photon switching, and improves upon previous experiments for freely propagating optical fields, including those in cold-atoms. Using high quality factor silicon nitride optical microcavities we show that the gain from the four-wave mixing process can lead to optical parametric os- cillation, allowing for the generation of multiple new wavelengths as wide as an octave of wavelengths. Next we show that by dispersion engineering the waveguide dimensions, we can generate combs by pumping at 1064 nm. The advantage of this platform is that we can independently tune the free spectral range (FSR) and the dispersion. We exploit this property of the silicon nitride microresonator platform to generate microcombs with various FSRs such as 20, 40-, 80-,100-GHz. Next we go on to characterize the spectral and temporal dynamics of the microresonator based combs and demonstrate that such parametric frequency combs can generate modelocked ultra-short pulses. Advisors/Committee Members: Vengalattore, Mukund (chair), Gaeta, Alexander L. (committee member), Mueller, Erich (committee member), Lipson, Michal (committee member).

Subjects/Keywords: Nonlinear optics; Nanophotonics; Atomic physics

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APA (6^th Edition):

Saha, K. (2014). Nonlinear Optics In Nanophotonic Structures. (Doctoral Dissertation). Cornell University. Retrieved from http://hdl.handle.net/1813/37087

Chicago Manual of Style (16^th Edition):

Saha, Kasturi. “Nonlinear Optics In Nanophotonic Structures.” 2014. Doctoral Dissertation, Cornell University. Accessed April 11, 2021. http://hdl.handle.net/1813/37087.

MLA Handbook (7^th Edition):

Saha, Kasturi. “Nonlinear Optics In Nanophotonic Structures.” 2014. Web. 11 Apr 2021.

Vancouver:

Saha K. Nonlinear Optics In Nanophotonic Structures. [Internet] [Doctoral dissertation]. Cornell University; 2014. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/1813/37087.

Council of Science Editors:

Saha K. Nonlinear Optics In Nanophotonic Structures. [Doctoral Dissertation]. Cornell University; 2014. Available from: http://hdl.handle.net/1813/37087

Cornell University

2. Fu, Walter. ULTRAFAST FIBER LASERS ENABLED BY HIGHLY NONLINEAR PULSE EVOLUTIONS.

Degree: PhD, Applied Physics, 2019, Cornell University

URL: http://hdl.handle.net/1813/67742

► Ultrafast lasers have had tremendous impact on both science and applications, far beyond what their inventors could have imagined. Commercially-available solid-state lasers can readily generate… (more)

▼ Ultrafast lasers have had tremendous impact on both science and applications, far beyond what their inventors could have imagined. Commercially-available solid-state lasers can readily generate coherent pulses lasting only a few tens of femtoseconds. The availability of such short pulses, and the huge peak intensities they enable, has allowed scientists and engineers to probe and manipulate materials to an unprecedented degree. Nevertheless, the scope of these advances has been curtailed by the complexity, size, and unreliability of such devices. For all the progress that laser science has made, most ultrafast lasers remain bulky, solid-state systems prone to misalignments during heavy use. The advent of fiber lasers with capabilities approaching that of traditional, solid-state lasers offers one means of solving these problems. Fiber systems can be fully integrated to be alignment-free, while their waveguide structure ensures nearly perfect beam quality. However, these advantages come at a cost: the tight confinement and long interaction lengths make both linear and nonlinear effects significant in shaping pulses. Much research over the past few decades has been devoted to harnessing and managing these effects in the pursuit of fiber lasers with higher powers, stronger intensities, and shorter pulse durations. This thesis focuses on less quantitative metrics of fiber laser performance, with an emphasis on furthering the versatility and practicality of ultrafast sources. Much of this work relies on the calculated use of strong fiber nonlinearities, turning conventionally-undesirable phenomena into crucial tools for enabling new capabilities. First, the generation of femtosecond-scale pulses from much slower, more robust sources is investigated, conferring not only reliability advantages but also a fundamentally greater scope for repetition rate tuning. Next, prospects for fiber lasers operating at wavelengths far from any gain media are explored. By leveraging optical parametric gain alongside chirped-pulse evolutions, energy and bandwidth generated at one wavelength can be efficiently converted to another, while keeping the pulse's phase and compressibility intact. Both the scaling properties and the underlying theoretical considerations of this approach are discussed. Prospects for realizing optical parametric sources in birefringent step-index fibers are then studied. By using the polarization modes in a telecom-grade fiber to obtain phase-matching, new wavelengths can be generated while eschewing photonic crystal fiber and its inherent practical disadvantages. Finally, more speculative ideas for future work along these themes are discussed. Advisors/Committee Members: Wise, Frank William (chair), Strogatz, Steven H. (committee member), Schaffer, Chris (committee member).

Subjects/Keywords: Physics; Optics; Nonlinear; fiber; Laser

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APA (6^th Edition):

Fu, W. (2019). ULTRAFAST FIBER LASERS ENABLED BY HIGHLY NONLINEAR PULSE EVOLUTIONS. (Doctoral Dissertation). Cornell University. Retrieved from http://hdl.handle.net/1813/67742

Chicago Manual of Style (16^th Edition):

Fu, Walter. “ULTRAFAST FIBER LASERS ENABLED BY HIGHLY NONLINEAR PULSE EVOLUTIONS.” 2019. Doctoral Dissertation, Cornell University. Accessed April 11, 2021. http://hdl.handle.net/1813/67742.

MLA Handbook (7^th Edition):

Fu, Walter. “ULTRAFAST FIBER LASERS ENABLED BY HIGHLY NONLINEAR PULSE EVOLUTIONS.” 2019. Web. 11 Apr 2021.

Vancouver:

Fu W. ULTRAFAST FIBER LASERS ENABLED BY HIGHLY NONLINEAR PULSE EVOLUTIONS. [Internet] [Doctoral dissertation]. Cornell University; 2019. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/1813/67742.

Council of Science Editors:

Fu W. ULTRAFAST FIBER LASERS ENABLED BY HIGHLY NONLINEAR PULSE EVOLUTIONS. [Doctoral Dissertation]. Cornell University; 2019. Available from: http://hdl.handle.net/1813/67742

Boston University

3. Keiser, George Robert. Near field interactions in terahertz metamaterials.

Degree: PhD, Physics, 2015, Boston University

URL: http://hdl.handle.net/2144/15653

► Terahertz (THz) frequencies comprise the portion of the electromagnetic spectrum more energetic than microwaves, but less energetic than infrared light. The THz band presents many… (more)

▼ Terahertz (THz) frequencies comprise the portion of the electromagnetic spectrum more energetic than microwaves, but less energetic than infrared light. The THz band presents many opportunities for condensed matter physics and optics engineering. From the physics perspective, advances in the generation and detection of THz radiation have opened the door for spectroscopic studies of a range of solid-state phenomena that manifest at THz frequencies. From an engineering perspective, THz frequencies are an under-used spectral region, ripe for the development of new devices. In both cases, the challenge for researchers is to overcome a lack of sources, detectors, and optics for THz light, termed the THz Gap. Metamaterials (MMs), composite structures with engineered index of refraction, n, and impedance, Z, provide one path towards realizing THz optics. MMs are an ideal platform for the design of local EM field distributions, and far-field optical properties. This is especially true at THz frequencies, where fabrication of inclusions is easily accomplished with photolithography. Historically, MM designs have been based around static configurations of resonant inclusions that work only in a narrow frequency band, limiting applications. Broadband and tunable MMs are needed to overcome this limit. This dissertation focuses on creating tunable and controllable MM structures through the manipulation of electromagnetic interactions between MM inclusions. We introduce three novel MM systems. Each system is studied computationally with CST-Studio, and experimentally via THz spectroscopy. First, we look at the tunable transmission spectrum of two coupled split ring resonators (SRRs) with different resonant frequencies. We show that introducing a lateral displacement between the two component resonators lowers the electromagnetic coupling between the SRRs, activating a new resonance. Second, we study an SRR array, coupled to a non-resonant closed ring array. We show that lowering the interaction strength through lateral displacement changes the MM oscillator strength by ~ 40% and electric field enhancement by a factor of 4. Finally, we show that interactions between a superconducting SRR array and a conducting ground plane result in a temperature and field strength dependent MM absorption. The peak absorption changes by ~ 40% with increasing electric field and by ~ 66% with increasing temperature.

Subjects/Keywords: Physics; Interactions; Metamaterials; Nonlinear; Terahertz

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APA (6^th Edition):

Keiser, G. R. (2015). Near field interactions in terahertz metamaterials. (Doctoral Dissertation). Boston University. Retrieved from http://hdl.handle.net/2144/15653

Chicago Manual of Style (16^th Edition):

Keiser, George Robert. “Near field interactions in terahertz metamaterials.” 2015. Doctoral Dissertation, Boston University. Accessed April 11, 2021. http://hdl.handle.net/2144/15653.

MLA Handbook (7^th Edition):

Keiser, George Robert. “Near field interactions in terahertz metamaterials.” 2015. Web. 11 Apr 2021.

Vancouver:

Keiser GR. Near field interactions in terahertz metamaterials. [Internet] [Doctoral dissertation]. Boston University; 2015. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/2144/15653.

Council of Science Editors:

Keiser GR. Near field interactions in terahertz metamaterials. [Doctoral Dissertation]. Boston University; 2015. Available from: http://hdl.handle.net/2144/15653

Hong Kong University of Science and Technology

4. Zhao, Luwei. Narrowband biphoton generation in the group delay regime.

Degree: 2016, Hong Kong University of Science and Technology

URL: http://repository.ust.hk/ir/Record/1783.1-87066 ; https://doi.org/10.14711/thesis-b1627761 ; http://repository.ust.hk/ir/bitstream/1783.1-87066/1/th_redirect.html

► Nonclassical photon pairs are standard tools to probe and exploit the quantum realm beyond classical limit. We generate the photon pairs by using spontaneous four-wave… (more)

▼ Nonclassical photon pairs are standard tools to probe and exploit the quantum realm beyond classical limit. We generate the photon pairs by using spontaneous four-wave mixing(sFWM) in cold atomic ensembles. We work with ⁸⁵Rb dark-line two-dimensional (2D) magneto-optical trap (MOT) to achieve large atomic density with high OD 170. In the theoretical study, we compare the two formalisms in the interaction and Heisenberg pictures and show that in low parametric gain regime both agree well. We extend the existing theories by taking into account the non-uniformity in the atom distribution, the pump, and the coupling laser intensity distribution in the longitudinal direction of the atomic cloud. we show that the profiles of the pump and coupling laser intensities have significant effects on the biphoton waveform. By controlling the spatial profile of the driving field, we can shape the biphoton waveform in time domain. On the other hand, the time-domain waveform of the photon pairs allows us to retrieve information on the spatial profile of the pump and coupling laser beams. Following the theory, we realize the shaping of biphoton with spatially modulated pump field experimentally. For such a large OD, we generate the narrow-band biphotons in the group delay regime, where the two-photon temporal correlation length is determined by the the group delay time τ_g of the slow anti-Stokes photon. The group delay time τ_g stems from the slow light effect in electromagnetically induced transparency (EIT), and the value is determined by OD and the coupling power. To explore the longest biphoton coherence time, we study the relationship between the the correlation time and coupling power while taking into account of the finite ground state dephasing rate. With optimal experimental parameters, we achieve the coherence time for narrow-band photon pairs up to 3.28 μs. We study the mirrorless optical parametric oscillation in cold atoms. Working with backward four-wave mixing schematics, we increase the parametric gain to get into the oscillation regime. To study the transition near the oscillation, we measure the second order auto-correlation of the field to verify its photon property.

Subjects/Keywords: Nonlinear optics ; Scattering (Physics) ; Magnetooptics

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APA (6^th Edition):

Zhao, L. (2016). Narrowband biphoton generation in the group delay regime. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-87066 ; https://doi.org/10.14711/thesis-b1627761 ; http://repository.ust.hk/ir/bitstream/1783.1-87066/1/th_redirect.html

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Zhao, Luwei. “Narrowband biphoton generation in the group delay regime.” 2016. Thesis, Hong Kong University of Science and Technology. Accessed April 11, 2021. http://repository.ust.hk/ir/Record/1783.1-87066 ; https://doi.org/10.14711/thesis-b1627761 ; http://repository.ust.hk/ir/bitstream/1783.1-87066/1/th_redirect.html.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Zhao, Luwei. “Narrowband biphoton generation in the group delay regime.” 2016. Web. 11 Apr 2021.

Vancouver:

Zhao L. Narrowband biphoton generation in the group delay regime. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2016. [cited 2021 Apr 11]. Available from: http://repository.ust.hk/ir/Record/1783.1-87066 ; https://doi.org/10.14711/thesis-b1627761 ; http://repository.ust.hk/ir/bitstream/1783.1-87066/1/th_redirect.html.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Zhao L. Narrowband biphoton generation in the group delay regime. [Thesis]. Hong Kong University of Science and Technology; 2016. Available from: http://repository.ust.hk/ir/Record/1783.1-87066 ; https://doi.org/10.14711/thesis-b1627761 ; http://repository.ust.hk/ir/bitstream/1783.1-87066/1/th_redirect.html

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Duke University

5. Schmittberger, Bonnie Lee. Multimode Atomic Pattern Formation via Enhanced Light-atom Interactions .

Degree: 2016, Duke University

URL: http://hdl.handle.net/10161/12108

► The nonlinear interaction between light and atoms is an extensive field of study with a broad range of applications in quantum information science and… (more)

Subjects/Keywords: Physics; Atomic physics; Optics; Nonlinear optics

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APA (6^th Edition):

Schmittberger, B. L. (2016). Multimode Atomic Pattern Formation via Enhanced Light-atom Interactions . (Thesis). Duke University. Retrieved from http://hdl.handle.net/10161/12108

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Schmittberger, Bonnie Lee. “Multimode Atomic Pattern Formation via Enhanced Light-atom Interactions .” 2016. Thesis, Duke University. Accessed April 11, 2021. http://hdl.handle.net/10161/12108.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Schmittberger, Bonnie Lee. “Multimode Atomic Pattern Formation via Enhanced Light-atom Interactions .” 2016. Web. 11 Apr 2021.

Vancouver:

Schmittberger BL. Multimode Atomic Pattern Formation via Enhanced Light-atom Interactions . [Internet] [Thesis]. Duke University; 2016. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10161/12108.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Schmittberger BL. Multimode Atomic Pattern Formation via Enhanced Light-atom Interactions . [Thesis]. Duke University; 2016. Available from: http://hdl.handle.net/10161/12108

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Sydney

6. Layden, Brett. Second-Order Nonlinear Processes in Warm Unmagnetized Plasmas .

Degree: 2013, University of Sydney

URL: http://hdl.handle.net/2123/9914

► Nonlinear processes are commonly invoked to describe a wide range of phenomena in both space plasmas and laboratory plasmas, allowing wave energy in a particular… (more)

▼ Nonlinear processes are commonly invoked to describe a wide range of phenomena in both space plasmas and laboratory plasmas, allowing wave energy in a particular mode to be transferred to different modes. Relevant processes include three-wave interactions and nonlinear wave-particle scattering. The strength of the wave coupling—and hence the nonlinear rates—for these processes is determined by the quadratic response tensor. The general expression for this tensor involves a number of velocity-space integrals of the velocity distribution function and denominators related to the Cerenkov resonance between waves and particles. Due to the difficulty of evaluating these integrals they are typically approximated by making assumptions about the phase speeds of the waves. However, the ranges of validity for these approximations are unclear, and the resulting approximate quadratic response tensors and nonlinear rates may be inaccurate in some regimes. Conversely, an exact expression for the quadratic response tensor of an unmagnetized Maxwellian plasma has been derived previously in terms of generalized plasma dispersion functions. This expression is valid for any phase speeds of the waves, but its length and complexity prevents its use in the calculation of nonlinear rates. What is lacking in the literature are more accurate explicit expressions for the quadratic response tensor that are appropriate for nonlinear rate calculations, from which also the accuracy of the typical approximations can be assessed. This thesis presents new, more accurate analytical expressions for the quadratic response tensor for various second-order processes in unmagnetized plasmas, and analytical and numerical calculations of the corresponding nonlinear rates. Comparisons are then made between these new nonlinear rates and the previous approximate rates, allowing the accuracy of the previous rates to be assessed and sharper bounds placed on their regimes of validity for the first time.

Subjects/Keywords: plasma physics; space physics; nonlinear wave processes

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APA (6^th Edition):

Layden, B. (2013). Second-Order Nonlinear Processes in Warm Unmagnetized Plasmas . (Thesis). University of Sydney. Retrieved from http://hdl.handle.net/2123/9914

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Layden, Brett. “Second-Order Nonlinear Processes in Warm Unmagnetized Plasmas .” 2013. Thesis, University of Sydney. Accessed April 11, 2021. http://hdl.handle.net/2123/9914.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Layden, Brett. “Second-Order Nonlinear Processes in Warm Unmagnetized Plasmas .” 2013. Web. 11 Apr 2021.

Vancouver:

Layden B. Second-Order Nonlinear Processes in Warm Unmagnetized Plasmas . [Internet] [Thesis]. University of Sydney; 2013. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/2123/9914.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Layden B. Second-Order Nonlinear Processes in Warm Unmagnetized Plasmas . [Thesis]. University of Sydney; 2013. Available from: http://hdl.handle.net/2123/9914

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Maryland

7. Bagaipo, Jupiter. Nonlinear Interchange Modes Near Marginal Stability.

Degree: Physics, 2013, University of Maryland

URL: http://hdl.handle.net/1903/14003

► The nonlinear stability of the ideal magnetohydrodynamic interchange mode, at marginal conditions, is studied. The interchange mode is made to be at marginal conditions by… (more)

Subjects/Keywords: Plasma physics; Physics; interchange mode; nonlinear instability; nonlinear interchange

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APA (6^th Edition):

Bagaipo, J. (2013). Nonlinear Interchange Modes Near Marginal Stability. (Thesis). University of Maryland. Retrieved from http://hdl.handle.net/1903/14003

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Bagaipo, Jupiter. “Nonlinear Interchange Modes Near Marginal Stability.” 2013. Thesis, University of Maryland. Accessed April 11, 2021. http://hdl.handle.net/1903/14003.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Bagaipo, Jupiter. “Nonlinear Interchange Modes Near Marginal Stability.” 2013. Web. 11 Apr 2021.

Vancouver:

Bagaipo J. Nonlinear Interchange Modes Near Marginal Stability. [Internet] [Thesis]. University of Maryland; 2013. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/1903/14003.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Bagaipo J. Nonlinear Interchange Modes Near Marginal Stability. [Thesis]. University of Maryland; 2013. Available from: http://hdl.handle.net/1903/14003

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Freie Universität Berlin

8. Beutler, Marcus. Generation of tunable femtosecond pulses in the vacuum ultraviolet spectral range.

Degree: 2012, Freie Universität Berlin

URL: https://refubium.fu-berlin.de/handle/fub188/12968

► This dissertation describes efficient generation of femtosecond vacuum ultraviolet pulses by using four-wave-mixing in noble gases. The fundamental and third harmonic of a titanium sapphire… (more)

Subjects/Keywords: vacuum ultraviolet; four-wave-mixing; ultrafast physics; nonlinear optics; 500 Naturwissenschaften und Mathematik::530 Physik::535 Licht, Infrarot- und Ultraviolettphänomene; 500 Naturwissenschaften und Mathematik::530 Physik

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APA (6^th Edition):

Beutler, M. (2012). Generation of tunable femtosecond pulses in the vacuum ultraviolet spectral range. (Thesis). Freie Universität Berlin. Retrieved from https://refubium.fu-berlin.de/handle/fub188/12968

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Beutler, Marcus. “Generation of tunable femtosecond pulses in the vacuum ultraviolet spectral range.” 2012. Thesis, Freie Universität Berlin. Accessed April 11, 2021. https://refubium.fu-berlin.de/handle/fub188/12968.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Beutler, Marcus. “Generation of tunable femtosecond pulses in the vacuum ultraviolet spectral range.” 2012. Web. 11 Apr 2021.

Vancouver:

Beutler M. Generation of tunable femtosecond pulses in the vacuum ultraviolet spectral range. [Internet] [Thesis]. Freie Universität Berlin; 2012. [cited 2021 Apr 11]. Available from: https://refubium.fu-berlin.de/handle/fub188/12968.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Beutler M. Generation of tunable femtosecond pulses in the vacuum ultraviolet spectral range. [Thesis]. Freie Universität Berlin; 2012. Available from: https://refubium.fu-berlin.de/handle/fub188/12968

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Northeastern University

9. Halu, Arda. Dynamics of and on complex networks.

Degree: PhD, Department of Physics, 2014, Northeastern University

URL: http://hdl.handle.net/2047/d20004937

► Complex networks are dynamic, evolving structures that can host a great number of dynamical processes. In this thesis, we address current challenges regarding the dynamics… (more)

▼ Complex networks are dynamic, evolving structures that can host a great number of dynamical processes. In this thesis, we address current challenges regarding the dynamics of and dynamical processes on complex networks. First, we study complex network dynamics from the standpoint of network growth. As a quantitative measure of the complexity and information content of networks generated by growing network models, we define and evaluate their entropy rate. We propose stochastic growth models inspired by the duplication-divergence mechanism to generate epistatic interaction networks and find that they exhibit the property of monochromaticity as a result of their dynamical evolution. Second, we explore the dynamics of quantum mechanical processes on complex networks. We investigate the Bose-Hubbard model on annealed and quenched scale-free networks as well as Apollonian networks and show that their phase diagram changes significantly in the presence of complex topologies, depending on the second degree of the degree distribution and the maximal eigenvalue of the adjacency matrix. We then study the Jaynes-Cummings-Hubbard model on various complex topologies and demonstrate the importance of the maximal eigenvalue of the hopping matrix in determining the phase diagram of the model. Third, we investigate dynamical processes on interacting and multiplex networks. We study opinion dynamics in a simulated setting of two antagonistically interacting networks and recover the importance of connectivity and committed agents. We propose a multiplex centrality measure that takes into account the connectivity patterns within and across different layers and find that the dynamics of biased random walks on multiplex networks gives rise to a centrality ranking that is different from univariate centrality measures. Finally, we study the statistical mechanics of multilayered spatial networks and demonstrate the emergence of significant link overlap and improved navigability in multiplex and interacting spatial networks.

Subjects/Keywords: Network Science; Statistical Physics; Physics; Statistical, Nonlinear, and Soft Matter Physics

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APA (6^th Edition):

Halu, A. (2014). Dynamics of and on complex networks. (Doctoral Dissertation). Northeastern University. Retrieved from http://hdl.handle.net/2047/d20004937

Chicago Manual of Style (16^th Edition):

Halu, Arda. “Dynamics of and on complex networks.” 2014. Doctoral Dissertation, Northeastern University. Accessed April 11, 2021. http://hdl.handle.net/2047/d20004937.

MLA Handbook (7^th Edition):

Halu, Arda. “Dynamics of and on complex networks.” 2014. Web. 11 Apr 2021.

Vancouver:

Halu A. Dynamics of and on complex networks. [Internet] [Doctoral dissertation]. Northeastern University; 2014. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/2047/d20004937.

Council of Science Editors:

Halu A. Dynamics of and on complex networks. [Doctoral Dissertation]. Northeastern University; 2014. Available from: http://hdl.handle.net/2047/d20004937

Duke University

10. Liu, Xiaojun. modeling and application of nonlinear metasurface .

Degree: 2018, Duke University

URL: http://hdl.handle.net/10161/16787

► A patterned metasurface can strongly scatter incident light, functioning as an extremely low-profile lens, filter, reflector or other optical devices. Nonlinear metasurfaces‒combine the properties… (more)

▼ A patterned metasurface can strongly scatter incident light, functioning as an extremely low-profile lens, filter, reflector or other optical devices. Nonlinear metasurfaces‒combine the properties of natural nonlinear medium with novel features such as negative refractive index, magneto-electric coupling‒provide novel nonlinear features not available in nature. Compared to conventional optical components that often extend many wavelengths in size, nonlinear metasurfaces are flexible and extremely compact. Characterization of a nonlinear metasurface is challenging, not only due to its inherent anisotropy, but also because of the rich wave interactions available. This thesis presents an overview of the work by the author in modeling and application of nonlinear metasurfaces. Analytical methods - transfer matrix method and surface homogenization method - for characterizing nonlinear metasurfaces are presented. A generalized transfer matrix method formalism for four wave mixing is derived, and applied to analyze nonlinear interface, film, and metallo-dielectric stack. Various channels of plasmonic and Fabry-perot enhancement are investigated. A homogenized description of nonlinear metasurfaces is presented. The homogenization procedure is based on the nonlinear generalized sheet transition conditions (GSTCs), where an optically thin nonlinear metasurface is modeled as a layer of dipoles radiating at fundamental and nonlinear frequencies. By inverting the nonlinear GSTCs, a retrieval procedure is developed to retrieve the nonlinear parameters of the nonlinear metasurface. As an example, we investigate a nonlinear metasurface which presents nonlinear magnetoelectric coupling in near infrared regime. The method is expected to apply to any patterned metasurface whose thickness is much smaller than the wavelengths of operation, with inclusions of arbitrary geometry and material composition, across the electromagnetic spectrum. The second part presents the applications of nonlinear metasurfaces. First, we show that the third-harmonic generation (THG) can be drastically enhanced by the nonlinear metasurfaces – film-coupled nanostripes. The large THG enhancement is experimentally and theoretically demonstrated. With numerical simulations, we present methods to clarify the origin of the THG from the metasurface. Second, the enhanced two-photon photochormism is investigated by integrating spiropyrans with film-coupled nanocubes. This metasurface platform couples almost 100% energy at resonance, and induces isomerization of spiropyrans to merocyanines. Due to the large Purcell enhancement introduced by the film-coupled nanocubes, fluorescence lifetime measurements on the merocyanine form reveal large enhancements on spontaneous emission rate, as well as high quantum efficiency. We show that this metasurface platform is capable of storing information, supports reading and writing with ultra-low power, offering new possibilities in optical data storage. Advisors/Committee Members: Smith, David R (advisor).

Subjects/Keywords: Electrical engineering; Computational physics; electromagnetics; metamaterials; nonlinear metasurface; nonlinear optics; plasmonics

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APA (6^th Edition):

Liu, X. (2018). modeling and application of nonlinear metasurface . (Thesis). Duke University. Retrieved from http://hdl.handle.net/10161/16787

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Liu, Xiaojun. “modeling and application of nonlinear metasurface .” 2018. Thesis, Duke University. Accessed April 11, 2021. http://hdl.handle.net/10161/16787.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Liu, Xiaojun. “modeling and application of nonlinear metasurface .” 2018. Web. 11 Apr 2021.

Vancouver:

Liu X. modeling and application of nonlinear metasurface . [Internet] [Thesis]. Duke University; 2018. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10161/16787.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Liu X. modeling and application of nonlinear metasurface . [Thesis]. Duke University; 2018. Available from: http://hdl.handle.net/10161/16787

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Johannes Gutenberg Universität Mainz

11. Jahja, Mohamad. Thin films of polythiophene: Linear and nonlinear optical characterization.

Degree: 2010, Johannes Gutenberg Universität Mainz

URL: http://ubm.opus.hbz-nrw.de/volltexte/2011/2646/

►

Wir haben die linearen und nichtlinearen optischen Eigenschaften von dünnen Schichten und planaren Wellenleitern aus mehreren konjugierten Polymeren (MEH-PPV und P3AT) und Polymeren mit -Elektronen… (more)

▼

Wir haben die linearen und nichtlinearen optischen Eigenschaften von dünnen Schichten und planaren Wellenleitern aus mehreren konjugierten Polymeren (MEH-PPV und P3AT) und Polymeren mit -Elektronen Systemen in der Seitenkette (PVK und PS) untersucht und verglichen. PVK und PS haben relativ kleine Werte des nichtlinearen Brechungsindex n2 bei 532 nm, nämlich (1,2 ± 0,5)10-14 cm2/W und (2,6 ± 0,5) 10-14 cm2/W.rnWir haben die linearen optischen Konstanten von mehreren P3ATs untersucht, insbesondere den Einfluss der Regioregularität und Kettenlänge der Alkylsubstituenten. Wir haben das am besten geeignete Polymere für Wellenleiter Anwendungen identifiziert, welches P3BT-ra genannt ist. Wir haben die linearen optischen Eigenschaften dünner Schichten des P3BT-ra untersucht, die mit Spincoating aus verschiedenen Lösungsmitteln mit unterschiedlichen Siedetemperaturen präparieret wurden. Wir haben festgestellt, dass P3BT-ra Filme aus Toluol-Lösungen die am besten geeigneten Wellenleiter für die intensitätsabhängigen Prismen-Kopplungs Experimente sind, weil diese geringe Wellenleiterdämpfungsverluste bei = 1064 nm haben. rnWir haben die Dispersionen des Wellenleiterdämfungsverlustes gw, des nichtlinearen Brechungsindex n2 und des nichtlinearen Absorptionskoeffizienten 2 von Wellenleitern aus P3BT-ra im Bereich von 700 - 1500 nm gemessen. Wir haben große Werte des nichtlinearen Brechungsindex bis 1,5x10-13 cm2/W bei 1150 nm beobachtet. Wir haben gefunden, dass die Gütenkriterien (“figures of merit“) für rein optische Schalter im Wellenlängebereich 1050 - 1200 nm erfüllt sind. Dieser Bereich entspricht dem niederenergetischen Ausläufer der Zwei-Photonen-Absorption. Die Gütekriterien von P3BT-ra gehören zu den besten der bisher bekannten Werte von konjugierten Polymeren.rnWir haben gefunden, dass P3BT-ra ein vielversprechender Kandidat für integriert-optische Schalter ist, weil es eine gute Kombination aus großer Nichtlinearität dritter Ordnung, geringen Wellenleiterdämpfungverlusten und ausreichender Photostabilität zeigt. rnWir haben einen Vergleich der gemessenen Dispersion von gw, n2 und 2 mit der Theorie durchgeführt. Durch Kurvenanpassung der Dispersion von gw haben wir gefunden, dass Rayleigh-Streuung der dominierende Dämpfungsmechanismus in MEH-PPV und P3BT-ra Wellenleitern ist. Ein quantenmechanischer Ansatz wurde zur Berechnung der nichtlinearen Suszeptibilität dritter Ordnung (3) verwendet, um die gemessenen Spektren von n2 und 2 von P3BT-ra und MEH-PPV zu simulieren. Dies kann erklären, dass sättigbare Absorption und Zwei-Photonen Absorption die hauptsächlichen Effekte sind, welche die Dispersion von n2 und 2 verursachen. rn

We have studied and compared the linear and nonlinear optical properties of thin films and planar waveguides of several conjugated polymers (MEH-PPV and P3AT) and polymers with -electron rich moieties in the side chain (PVK and PS). PVK and PS have shown relatively small values of nonlinear refractive index n2 at 532 nm of (1.2±0.5) 10-14 cm2/W and (2.6±0.5)10-14…

Subjects/Keywords: Polythiophene, Nonlinear, Optics, Conjugated, Polymer; Physics

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APA (6^th Edition):

Jahja, M. (2010). Thin films of polythiophene: Linear and nonlinear optical characterization. (Doctoral Dissertation). Johannes Gutenberg Universität Mainz. Retrieved from http://ubm.opus.hbz-nrw.de/volltexte/2011/2646/

Chicago Manual of Style (16^th Edition):

Jahja, Mohamad. “Thin films of polythiophene: Linear and nonlinear optical characterization.” 2010. Doctoral Dissertation, Johannes Gutenberg Universität Mainz. Accessed April 11, 2021. http://ubm.opus.hbz-nrw.de/volltexte/2011/2646/.

MLA Handbook (7^th Edition):

Jahja, Mohamad. “Thin films of polythiophene: Linear and nonlinear optical characterization.” 2010. Web. 11 Apr 2021.

Vancouver:

Jahja M. Thin films of polythiophene: Linear and nonlinear optical characterization. [Internet] [Doctoral dissertation]. Johannes Gutenberg Universität Mainz; 2010. [cited 2021 Apr 11]. Available from: http://ubm.opus.hbz-nrw.de/volltexte/2011/2646/.

Council of Science Editors:

Jahja M. Thin films of polythiophene: Linear and nonlinear optical characterization. [Doctoral Dissertation]. Johannes Gutenberg Universität Mainz; 2010. Available from: http://ubm.opus.hbz-nrw.de/volltexte/2011/2646/

Cornell University

12. Venkataraman, Vivek. Few-Photon Nonlinear Optics In Photonic Bandgap Fibers.

Degree: PhD, Electrical Engineering, 2012, Cornell University

URL: http://hdl.handle.net/1813/31172

► The ability to control light with light at ultralow powers has been a major avenue of research in photonics with applications to optical communications, computation,… (more)

▼ The ability to control light with light at ultralow powers has been a major avenue of research in photonics with applications to optical communications, computation, and signal processing. Such light-by-light scattering is achieved in a medium with a strong light-matter interaction, and for the development of quantum information networks it is important to demonstrate such effects near the single-photon level. Alkali-metal vapors such as rubidium (Rb) enable strong light-matter interactions due to the large cross section per atom and well-defined energy level structure, while the use of optical fibers offers the advantage of possible integration with modern optical communication systems. Hollow-core photonic band-gap fibers (PBGFs) can combine both these technologies such that both the atoms and the optical fields are transversely confined to a region that is a few wavelengths in size, which offers the prospect of exploring few-photon nonlinear interactions. We generate large optical depths in such a Rb-PBGF system, and the tight light confinement, high vapor density and long interaction length allow us to perform nonlinear optics at ultralow power. We demonstrate large signal amplification (>100) and frequency conversion using a four-wave mixing process with only microwatts of pump power. This is, to our knowledge, the largest gain observed at such low power. We perturb the coherence of this four-wave mixing to demonstrate all-optical modulation at unprecedented bandwidths (~300 MHz) for an atomic-vapor system, with an energy density of only tens of pho- tons per atomic cross-section, comparable to that achieved in more elaborate setups based on cold-atomic clouds. We then demonstrate an enhancement of several orders of magnitude in degenerate two-photon absorption in our RbPBGF system over that achieved in bulk vapor cells in a focused beam geometry. This allows us to directly measure two-photon absorption from a beam by detecting its intensity on a photodiode. Further, employing a near-resonant, non-degenerate two-photon transition in Rb, we demonstrate all-optical intensity modulation with just a few photons (<20), or only a few attojoules of energy, at relatively large bandwidths (~50 MHz) for such a sensitive scheme. This result takes us to within an order of magnitude of single-photon switching, and improves upon previous experiments for freely propagating optical fields, including those in cold-atoms. Finally, we produce relatively large cross-phase shifts of a few milliradians on a meter beam with <20 signal photons by tuning slightly away from resonance on the same non-degenerate two-photon transition. This corresponds to a phase shift of 0.3 milliradian per photon, with a fast response time of <5 ns. This represents, to our knowledge, the largest such nonlinear phase shift induced in a single-pass through a room temperature medium. Our Rb-PBGF system can thus potentially be employed to realize weak-nonlinearity based quantum computation and quantum non-demolition measurement of photon number. Through… Advisors/Committee Members: Lipson, Michal (chair), Gaeta, Alexander L. (committee member), Rana, Farhan (committee member).

Subjects/Keywords: Nonlinear Optics; Atomic Physics; Quantum Information

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Venkataraman, V. (2012). Few-Photon Nonlinear Optics In Photonic Bandgap Fibers. (Doctoral Dissertation). Cornell University. Retrieved from http://hdl.handle.net/1813/31172

Chicago Manual of Style (16^th Edition):

Venkataraman, Vivek. “Few-Photon Nonlinear Optics In Photonic Bandgap Fibers.” 2012. Doctoral Dissertation, Cornell University. Accessed April 11, 2021. http://hdl.handle.net/1813/31172.

MLA Handbook (7^th Edition):

Venkataraman, Vivek. “Few-Photon Nonlinear Optics In Photonic Bandgap Fibers.” 2012. Web. 11 Apr 2021.

Vancouver:

Venkataraman V. Few-Photon Nonlinear Optics In Photonic Bandgap Fibers. [Internet] [Doctoral dissertation]. Cornell University; 2012. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/1813/31172.

Council of Science Editors:

Venkataraman V. Few-Photon Nonlinear Optics In Photonic Bandgap Fibers. [Doctoral Dissertation]. Cornell University; 2012. Available from: http://hdl.handle.net/1813/31172

Georgia Tech

13. Berman, Simon Abraham. Classical mechanisms of recollision and high harmonic generation.

Degree: PhD, Physics, 2019, Georgia Tech

URL: http://hdl.handle.net/1853/61214

► Thirty years after the demonstration of the production of high laser harmonics through nonlinear laser-gas interaction, high harmonic generation (HHG) is being used to probe… (more)

▼ Thirty years after the demonstration of the production of high laser harmonics through nonlinear laser-gas interaction, high harmonic generation (HHG) is being used to probe molecular dynamics in real time and is realizing its technological potential as a tabletop source of attosecond pulses in the XUV to soft X-ray range. Despite experimental progress, theoretical efforts have been stymied by the excessive computational cost of first-principles simulations and the difficulty of systematically deriving reduced models for the non-perturbative, multiscale interaction of an intense laser pulse with a macroscopic gas of atoms. In this thesis, we investigate first-principles reduced models for HHG using classical mechanics. On the microscopic level, we examine the recollision process—the laser-driven collision of an ionized electron with its parent ion—that drives HHG. Using nonlinear dynamics, we elucidate the indispensable role played by the ionic potential during recollisions in the strong-field limit. On the macroscopic level, we show that the intense laser-gas interaction can be cast as a classical field theory. Borrowing a technique from plasma physics, we systematically derive a hierarchy of reduced Hamiltonian models for the self-consistent interaction between the laser and the atoms during pulse propagation. The reduced models can accommodate either classical or quantum electron dynamics, and in both cases, simulations over experimentally-relevant propagation distances are feasible. We build a classical model based on these simulations which agrees quantitatively with the quantum model for the propagation of the dominant components of the laser field. Subsequently, we use the classical model to trace the coherent buildup of harmonic radiation to its origin in phase space. In a simplified geometry, we show that the anomalously high frequency radiation seen in simulations results from the delicate interplay between electron trapping and higher energy recollisions brought on by propagation effects. Advisors/Committee Members: Chandre, Cristel (advisor), Uzer, Turgay (advisor), Berger, Claire (committee member), Cvitanovic, Predrag (committee member), Kennedy, Brian (committee member), de la Llave, Rafael (committee member), Lorin, Emmanuel (committee member), Shadwick, Bradley (committee member).

Subjects/Keywords: Attosecond physics; Hamiltonian systems; Nonlinear dynamics

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APA (6^th Edition):

Berman, S. A. (2019). Classical mechanisms of recollision and high harmonic generation. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/61214

Chicago Manual of Style (16^th Edition):

Berman, Simon Abraham. “Classical mechanisms of recollision and high harmonic generation.” 2019. Doctoral Dissertation, Georgia Tech. Accessed April 11, 2021. http://hdl.handle.net/1853/61214.

MLA Handbook (7^th Edition):

Berman, Simon Abraham. “Classical mechanisms of recollision and high harmonic generation.” 2019. Web. 11 Apr 2021.

Vancouver:

Berman SA. Classical mechanisms of recollision and high harmonic generation. [Internet] [Doctoral dissertation]. Georgia Tech; 2019. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/1853/61214.

Council of Science Editors:

Berman SA. Classical mechanisms of recollision and high harmonic generation. [Doctoral Dissertation]. Georgia Tech; 2019. Available from: http://hdl.handle.net/1853/61214

Cornell University

14. Zhu, Zimu. NONLINEAR OPTICAL PULSE PROPAGATION IN MULTIMODE WAVEGUIDES.

Degree: PhD, Mechanical Engineering, 2020, Cornell University

URL: http://hdl.handle.net/1813/70423

► Soliton solutions of the (1+1)D nonlinear Schrödinger equation have long been the focus of immense research effort, and have provided us with the foundation for… (more)

▼ Soliton solutions of the (1+1)D nonlinear Schrödinger equation have long been the focus of immense research effort, and have provided us with the foundation for a large portion of our current understanding of nonlinear optical phenomena, particularly in single-mode optical fiber. Today, single-mode fiber has entrenched itself as the primary workhorse in many applications, from fiber lasers to imaging techniques to telecommunications. However, as these technologies approach fundamental limits, multimode fiber has presented itself as a promising route toward further advances. Supporting many spatial eigenmodes, multimode fiber provides a method of achieving higher capacities in data transmission through space-division multiplexing, as well as larger mode areas for higher energy fiber laser sources and amplifiers. They are also interesting from a purely scientific point of view, as an ideal testbed for rich spatiotemporal nonlinear dynamics. In single mode fiber, solitons of the (1+1)D nonlinear Schrödinger equation occur when linear dispersion and the Kerr nonlinearity balance to produce localized pulses. While the literature on (1+1)D soliton dynamics is extensive, nonlinear dynamics in multimode fiber have been far less explored. Multiple spatial eigenmodes are supported, with intra- and intermodal contributions to the dispersion, and propagation involving both spatial and temporal degrees of freedom. Knowledge of multimode soliton properties would provide a basis for understanding complex nonlinear dynamics in multimode fiber in the same way that knowledge of (1+1)D solitons does for single-mode fiber. Although some prior such work exists, the observed solitons were either dominated by the fundamental mode, or were highly multimode, resulting in the measurements being obfuscated by the sheer complexity of the system. Thus, experiments that add systematic understanding of multimode solitons are needed. In particular, the study of solitons in a small number of modes is a natural step from single-mode to many-mode, and ultimately, bulk spatiotemporal systems. Few-mode fiber is the perfect platform for such studies. Here, results from pulse-propagation experiments designed to isolate multimode solitons in graded-index fiber that supports only 3 spatial eigenmodes are presented. By varying the input energy and modal composition of the launched pulses, we observe a continuous variation of multimode solitons with different spatiotemporal properties. Due to their degrees of freedom, they exhibit an energy-volume relation that is distinct from those of single-mode and fully spatiotemporal solitons. From a theoretical standpoint, while multimode fibers can be modelled as a single (3+1)D system, they can also be described by a system of coupled modes. While theory and simulations have exploited this modal picture for insight, experiments have not been able to take advantage of this, instead indirectly inferring modal dynamics from full-field measurements. Steps have been previously taken toward full modal control and… Advisors/Committee Members: Kirby, Brian (chair), Wise, Frank (committee member), Guckenheimer, John (committee member), Rana, Farhan (committee member).

Subjects/Keywords: dynamics; fiber; multimode; nonlinear; optics; physics

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APA (6^th Edition):

Zhu, Z. (2020). NONLINEAR OPTICAL PULSE PROPAGATION IN MULTIMODE WAVEGUIDES. (Doctoral Dissertation). Cornell University. Retrieved from http://hdl.handle.net/1813/70423

Chicago Manual of Style (16^th Edition):

Zhu, Zimu. “NONLINEAR OPTICAL PULSE PROPAGATION IN MULTIMODE WAVEGUIDES.” 2020. Doctoral Dissertation, Cornell University. Accessed April 11, 2021. http://hdl.handle.net/1813/70423.

MLA Handbook (7^th Edition):

Zhu, Zimu. “NONLINEAR OPTICAL PULSE PROPAGATION IN MULTIMODE WAVEGUIDES.” 2020. Web. 11 Apr 2021.

Vancouver:

Zhu Z. NONLINEAR OPTICAL PULSE PROPAGATION IN MULTIMODE WAVEGUIDES. [Internet] [Doctoral dissertation]. Cornell University; 2020. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/1813/70423.

Council of Science Editors:

Zhu Z. NONLINEAR OPTICAL PULSE PROPAGATION IN MULTIMODE WAVEGUIDES. [Doctoral Dissertation]. Cornell University; 2020. Available from: http://hdl.handle.net/1813/70423

15. Bart, Graeme. Bridging the Microscopic and Macroscopic Realms of Laser Driven Plasma Dynamics .

Degree: 2018, University of Ottawa

URL: http://hdl.handle.net/10393/38187

► The physical processes shaping laser plasma dynamics take place on length scales ranging from the microscopic (1 ångström) to the macroscopic realms (µm). Microscopic field… (more)

▼ The physical processes shaping laser plasma dynamics take place on length scales ranging from the microscopic (1 ångström) to the macroscopic realms (µm). Microscopic field fluctuations due to the motions of individual plasma charges evolve on an atomic scale. Collisional effects influencing thermalization and ionization processes depend on the plasma fields on an atomic level. Simultaneously, collective processes such as plasma oscillations take place on a mesoscopic length scale of many-nm. The macroscopic realm is ultimately determined by the laser which typically spans hundreds of nm to a few µm. Consequently, ab-initio modelling of laser plasma dynamics requires the resolution of length scales from 1Å to multiple µm. As such, in order to bridge the microscopic and macroscopic length scales of light-matter interaction, in is necessary to account for the individual motions of up to ~10¹¹ particles. This is a not an insignificant undertaking. Until recently, approaches to numerical modelling of light-matter interactions were limited to MD and PIC, each with their own limitations. MicPIC has been developed to fill the gap left by MD and PIC but so far has not been adapted for scalable parallel processing on large distributed memory machines. Thus, its full potential was not able to be fully realized until now. This thesis presents the massively parallel MicPIC method capable of bridging the micro- and macroscopic realms. A wide range of applications that have heretofore not been accessible to theory or, at best, had limited applicability are now open for thorough investigation. Among these are nonlinear nanophotonics, quantum nanophotonics, laser machining, ab-initio dynamics of strongly coupled plasmas, high-harmonic generation, electron and x-ray sources, and optical switching. Two of the first applications of parallel MicPIC to a selection of such problems are shown and discussed below, demonstrating the applicability of the method to a wide variety of newly accessible strong field laser-plasma physics phenomena.

Subjects/Keywords: nonlinear optics; plasma physics; simulation; nanophotonics

10 more images…

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APA (6^th Edition):

Bart, G. (2018). Bridging the Microscopic and Macroscopic Realms of Laser Driven Plasma Dynamics . (Thesis). University of Ottawa. Retrieved from http://hdl.handle.net/10393/38187

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Bart, Graeme. “Bridging the Microscopic and Macroscopic Realms of Laser Driven Plasma Dynamics .” 2018. Thesis, University of Ottawa. Accessed April 11, 2021. http://hdl.handle.net/10393/38187.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Bart, Graeme. “Bridging the Microscopic and Macroscopic Realms of Laser Driven Plasma Dynamics .” 2018. Web. 11 Apr 2021.

Vancouver:

Bart G. Bridging the Microscopic and Macroscopic Realms of Laser Driven Plasma Dynamics . [Internet] [Thesis]. University of Ottawa; 2018. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10393/38187.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Bart G. Bridging the Microscopic and Macroscopic Realms of Laser Driven Plasma Dynamics . [Thesis]. University of Ottawa; 2018. Available from: http://hdl.handle.net/10393/38187

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

16. Banks, Hunter. Electron-Hole Recollisions in Driven Quantum Wells.

Degree: 2016, University of California – eScholarship, University of California

URL: http://www.escholarship.org/uc/item/69c6m3zk

► Driving semiconductor quantum wells with terahertz electric fields strong enough to overcome the Coulomb attraction between bound electron-hole pairs leads to high-order sideband generation (HSG).… (more)

▼ Driving semiconductor quantum wells with terahertz electric fields strong enough to overcome the Coulomb attraction between bound electron-hole pairs leads to high-order sideband generation (HSG). In HSG, excitons are optically-injected into quantum wells by a weak near-infrared (NIR) laser while simultaneously being illuminated with a terahertz field from the UCSB Free Electron Laser. The phenomenon can be described by the so-called "three step model" developed in high-field atomic physics: (1) the electron and hole tunnel-ionize in the strong field, (2) the now-free particles accelerate in the field, and (3) they recollide, emitting a photon. The two lasers are continuous, so the emitted photons are sidebands on the NIR laser. Because of the large gain of kinetic energy before recollision, an HSG spectrum has a broad bandwidth with many more sidebands above the NIR frequency than below. The largest spectra span over one hundred nanometers, with over 100th order sidebands above and 20th order below.The electron and hole must remain coherent throughout their trajectories, which can last hundreds of femtoseconds and extend for more than fifty nanometers, if they are to recollide. Sidebands have been observed that result from recollisions with kinetic energies far above the threshold for optical phonon emission. These high orders persist up to room temperature. Not even quenched disorder in the quantum wells strongly attenuates the HSG signal. Because of this coherence, the electron and hole are very sensitive to the complete band structure of the material. Excitation by linear NIR polarization creates both the electron and hole in a superposition of spin-up and spin-down states with complex coefficients given by the relative orientation of the NIR polarization and the THz polarization. Interference between these the spin-up and spin-down particles, particularly in the valence band and mediated by non-Abelian Berry curvature, has large effects on both the intensity and polarization state of the sidebands. The connection between HSG and complete band structure points to the possibility of directly measuring both the band dispersion relations as well as the non-Abelian Berry curvature of the host material.

Subjects/Keywords: Physics; Nonlinear optics; Quantum wells; Terahertz

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APA (6^th Edition):

Banks, H. (2016). Electron-Hole Recollisions in Driven Quantum Wells. (Thesis). University of California – eScholarship, University of California. Retrieved from http://www.escholarship.org/uc/item/69c6m3zk

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Banks, Hunter. “Electron-Hole Recollisions in Driven Quantum Wells.” 2016. Thesis, University of California – eScholarship, University of California. Accessed April 11, 2021. http://www.escholarship.org/uc/item/69c6m3zk.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Banks, Hunter. “Electron-Hole Recollisions in Driven Quantum Wells.” 2016. Web. 11 Apr 2021.

Vancouver:

Banks H. Electron-Hole Recollisions in Driven Quantum Wells. [Internet] [Thesis]. University of California – eScholarship, University of California; 2016. [cited 2021 Apr 11]. Available from: http://www.escholarship.org/uc/item/69c6m3zk.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Banks H. Electron-Hole Recollisions in Driven Quantum Wells. [Thesis]. University of California – eScholarship, University of California; 2016. Available from: http://www.escholarship.org/uc/item/69c6m3zk

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Adelaide

17. Abou Dakka, Milad. Towards Purely Laser Based Generation and Trapping of Metastable Krypton.

Degree: 2019, University of Adelaide

URL: http://hdl.handle.net/2440/128348

► Radioisotopes that break down at a constant rate over time through radioactive decay allow scientists to understand the development of geological and anthropological history by… (more)

▼ Radioisotopes that break down at a constant rate over time through radioactive decay allow scientists to understand the development of geological and anthropological history by dating samples that contain such isotopes. While many techniques exist to measure the age of a sample, in this thesis we explore the possibility of enhancing the atom trap trace analysis (ATTA) method, which has made significant strides in the area of ultra-sensitive radioisotope detection, especially with the use of metastable noble gas radionuclides. A metastable atom is an atom in a stable, long-lived (>1 ms) excited state. Noble gases have the longest metastable lifetimes, which combined with their geochemical inertness, make them ideal candidates for geological and environmental radiometric techniques. The production of metastable noble gases for this purpose has traditionally relied on discharge sources, but this method suffers from important drawbacks such as high levels of crosscontamination and poor excitation efficiencies. In an effort to overcome these drawbacks, the method described in this work presents a new platform for implementing, characterising and comparing purely laser-based production of metastable noble gases. In the first part of this thesis, we present both state-of-the-art experimental results in the purely laser-based generation of metastable krypton atoms, and a physically realistic simulation with good agreement with our experimental results. Our calculation of the twophoton absorption cross section for krypton (to a metastable-generating excited state) using 215nm deep ultraviolet (DUV) laser radiation, obtained by fitting with theory, confirms that high metastable production efficiencies are possible with laser-based techniques. In addition to this parameter, the branching ratio and photoionisation rate from the excited state are calculated and agree with the literature. In the second part, we present the experimental progress to date for a brand new method of manipulating metastable noble gas atoms using a two-stage approach of metastable production then trapping via a magneto-optical trap (MOT). While the results are limited due to experimental difficulties, they are complemented by a physically realistic 3D simulation based on the Monte Carlo method. This simulation suggests that the production and trapping of metastable noble gases is feasible without the use of a discharge source, a Zeeman slower, and even a secondary excitation chamber. However, the loading rate for such a MOT is not sufficient for ATTA measurements without drastic changes in the experimental configuration. In the final part, we propose a next-generation ATTA system based on stimulated rapid adiabatic passage (STIRAP) to transfer noble gas atoms to their metastable state with near 100% efficiency. This technique for the generation of metastable noble gases would be purely laser-based and would compete with the loading rates of conventional production techniques, while avoiding their deleterious effects. We conclude by identifying limits of… Advisors/Committee Members: Luiten, Andre N. (advisor), Light, Philip (advisor), Tsiminis, Georgios (advisor), School of Physical Sciences (school).

Subjects/Keywords: Nonlinear optics; AMO physics; Light-matter interaction

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APA (6^th Edition):

Abou Dakka, M. (2019). Towards Purely Laser Based Generation and Trapping of Metastable Krypton. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/128348

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Abou Dakka, Milad. “Towards Purely Laser Based Generation and Trapping of Metastable Krypton.” 2019. Thesis, University of Adelaide. Accessed April 11, 2021. http://hdl.handle.net/2440/128348.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Abou Dakka, Milad. “Towards Purely Laser Based Generation and Trapping of Metastable Krypton.” 2019. Web. 11 Apr 2021.

Vancouver:

Abou Dakka M. Towards Purely Laser Based Generation and Trapping of Metastable Krypton. [Internet] [Thesis]. University of Adelaide; 2019. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/2440/128348.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Abou Dakka M. Towards Purely Laser Based Generation and Trapping of Metastable Krypton. [Thesis]. University of Adelaide; 2019. Available from: http://hdl.handle.net/2440/128348

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Texas – Austin

18. -2611-4914. Mapping the nanoplasma regime using harmonics.

Degree: PhD, Physics, 2018, University of Texas – Austin

URL: http://hdl.handle.net/2152/63992

► Laser-irradiated microclusters exhibit a range of useful and scienti cally-relevant phenomena, including e cient absorption, harmonic generation, and anomalous dispersion. These properties make them useful… (more)

Subjects/Keywords: Nanoplasma; Laser; Plasma; Nonlinear optics; Physics; Experiment

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APA (6^th Edition):

-2611-4914. (2018). Mapping the nanoplasma regime using harmonics. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/63992

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Chicago Manual of Style (16^th Edition):

-2611-4914. “Mapping the nanoplasma regime using harmonics.” 2018. Doctoral Dissertation, University of Texas – Austin. Accessed April 11, 2021. http://hdl.handle.net/2152/63992.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

MLA Handbook (7^th Edition):

-2611-4914. “Mapping the nanoplasma regime using harmonics.” 2018. Web. 11 Apr 2021.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Vancouver:

-2611-4914. Mapping the nanoplasma regime using harmonics. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2018. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/2152/63992.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Council of Science Editors:

-2611-4914. Mapping the nanoplasma regime using harmonics. [Doctoral Dissertation]. University of Texas – Austin; 2018. Available from: http://hdl.handle.net/2152/63992

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

19. Bendinelli, Anthony James. The application of visualization methods to educational data sets with inspiration from statistical and fluid mechanics.

Degree: PhD, Physics, 2014, University of Texas – Austin

URL: http://hdl.handle.net/2152/24791

► This dissertation focuses on the development of visualization methods that enable us to examine longitudinal data in a unique way. We take inspiration from statistical… (more)

▼ This dissertation focuses on the development of visualization methods that enable us to examine longitudinal data in a unique way. We take inspiration from statistical and fluid mechanics to represent our data as a "flow" through time. Our visualizations represent vector fields (or flow plots), streamlines, and trajectories, and they are constructed in a similar manner to how one might analyze the aggregate motion of particles in a fluid. However, the subject of our research extends beyond ordinary fluid mechanics. We will use our visualizations to examine statewide standardized test scores in Texas from 2003 to 2011. The nature of the data makes it a perfect match for our methodology, since students' test scores tend to change over time in a semi-deterministic but nonlinear manner. Furthermore, our methods represent a departure from the standard ways of analyzing educational data. By visualizing the changes in students' test scores over a nine-year period, we discovered that our flow plots were changing with the eventual graduating class of 2012. The change in our visualizations was caused by an educational policy known as the Student Success Initiative, or SSI. The policy forced students to pass their standardized tests in 5th and 8th grade, or risk being held back a grade. To help with this process, students who initially failed were given extra instruction and additional opportunities to take the test. SSI was implemented in such a way that it would affect the class of 2012 and beyond, although we did not know of the program's existence until our plots had been developed. SSI had a successful impact on the educational career of Texas students; a far greater percentage of students were able to pass the 5th and 8th grade standardized tests after SSI was implemented. The striking feature of SSI, however, is that it also significantly improved test scores in 6th, 7th, 9th, and 10th grade. Despite its success at improving test scores over many years and grades, the program was eventually defunded. This was partially due to an inability to construct a lengthy longitudinal analysis of the program's influence. Our methodology would have conclusively shown the effectiveness of the SSI policy. Despite the defunding of the SSI, I am confident our methodology can be extended to illustrate changes in other data systems. These systems may or may not be related to education; our code and techniques are designed to be as universal as possible. We will explore several extensions to other data sets at the end of this dissertation. Advisors/Committee Members: Marder, Michael P., 1960- (advisor).

Subjects/Keywords: Physics; Nonlinear systems; Data visualization; Education

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Bendinelli, A. J. (2014). The application of visualization methods to educational data sets with inspiration from statistical and fluid mechanics. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/24791

Chicago Manual of Style (16^th Edition):

Bendinelli, Anthony James. “The application of visualization methods to educational data sets with inspiration from statistical and fluid mechanics.” 2014. Doctoral Dissertation, University of Texas – Austin. Accessed April 11, 2021. http://hdl.handle.net/2152/24791.

MLA Handbook (7^th Edition):

Bendinelli, Anthony James. “The application of visualization methods to educational data sets with inspiration from statistical and fluid mechanics.” 2014. Web. 11 Apr 2021.

Vancouver:

Bendinelli AJ. The application of visualization methods to educational data sets with inspiration from statistical and fluid mechanics. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2014. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/2152/24791.

Council of Science Editors:

Bendinelli AJ. The application of visualization methods to educational data sets with inspiration from statistical and fluid mechanics. [Doctoral Dissertation]. University of Texas – Austin; 2014. Available from: http://hdl.handle.net/2152/24791

Drexel University

20. Jones, Timothy Douglas. New dynamical insights on the global behavior of chaotic attractors.

Degree: 2012, Drexel University

URL: http://hdl.handle.net/1860/3790

► A paraphrase of Tolstoy that has become popular in the field of nonlinear dynamics is that while all linear systems are linear in the same… (more)

▼ A paraphrase of Tolstoy that has become popular in the field of nonlinear dynamics is that while all linear systems are linear in the same way, all nonlinear systems are nonlinear in their own ways. Despite this being quite true, there can be found a number of universal features in nonlinear systems which unify them in ways that enhance our understanding of their behavior.That nature is replete with nonlinear systems has proven to be a great challenge to our scientific understanding of the world. And while mathematics has proven to be apt at describing a multitude of physical phenomenon in the form of deterministic equations which describe future behavior based on a system's current state, it in and of itself held a rather shocking surprise which is now called Chaos. In Chaos we find deterministic systems which, due to our lack of omniscience, and the physical impossibility of building computers with in nite precision, become wildly unpredictable as they evolve in time. A number of new tools were developed to understand these systems, including a powerful program of topological analysis which has been completed for three dimensions. Yet, there still remains a number of unanswered dynamical questions about chaotic systems. Two such questions are the primary focus of this thesis.The first question we will address is regarding the general shape of the strange attractor. Specifically, what can we learn about the shape of strange attractor from the dynamical equations without numerically integrating them? For example, the R ossler and Lorenz attractors have remarkably similar dynamical equations, and yet are topologically very distinct. There is no self-evident relation between the dynamical equations that describe a strange attractor and its shape in phase space. Previously, we only had the xed points to act as general guides as to the shape of the attractor, but these point sets are not exceedingly descriptive. We will outline work done to find more interesting sets of points from the dynamical equations themselves, sets of points which provide a sort of skeletal-structure for the strange attractors. We have examined these structures for a large number of strange attractors of varying topological nature.The second question is one which has been treated by only a small number of researchers, and not as descriptively as we do here. When viewed in co-dimension-2 space (that is, two parameters of the attractor varied, all others kept constant), one finds some remarkable regular patterns in the mapping of the intensity of Lyapunov exponents. While progress has been made in addressing the origin of these shapes, there has not yet been a full explanation to the simple question: where do these patterns come from, and what do they tell us about the dynamical system? We will examine these patterns in detail and provide a broad explanatory mechanism for them, with a particular focus on the R ossler attractor. We will also show how these ndings can be used to predict the occurrence of super-stable periodic orbits as the… Advisors/Committee Members: Gilmore, Robert, 1941-.

Subjects/Keywords: Physics; Chaotic behavior in systems; Nonlinear theories

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APA (6^th Edition):

Jones, T. D. (2012). New dynamical insights on the global behavior of chaotic attractors. (Thesis). Drexel University. Retrieved from http://hdl.handle.net/1860/3790

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Jones, Timothy Douglas. “New dynamical insights on the global behavior of chaotic attractors.” 2012. Thesis, Drexel University. Accessed April 11, 2021. http://hdl.handle.net/1860/3790.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Jones, Timothy Douglas. “New dynamical insights on the global behavior of chaotic attractors.” 2012. Web. 11 Apr 2021.

Vancouver:

Jones TD. New dynamical insights on the global behavior of chaotic attractors. [Internet] [Thesis]. Drexel University; 2012. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/1860/3790.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Jones TD. New dynamical insights on the global behavior of chaotic attractors. [Thesis]. Drexel University; 2012. Available from: http://hdl.handle.net/1860/3790

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Freie Universität Berlin

21. Alekhin, Alexandr. Ultraschnelle Magnetisierungsdynamik durch Transport heißer Ladungträger.

Degree: 2016, Freie Universität Berlin

URL: http://dx.doi.org/10.17169/refubium-12139

► Diese Arbeit umfasst die Untersuchung der ultraschnellen Magnetisierungsdynamik durch Transport heißer Ladungträger (HC) in metallischen Multilayer(ML)-Strukturen anhand zeitaufgelöster linearer und nichtlinearer optischer Femtosekundenspektroskopie. Der lineare… (more)

▼ Diese Arbeit umfasst die Untersuchung der ultraschnellen Magnetisierungsdynamik durch Transport heißer Ladungträger (HC) in metallischen Multilayer(ML)-Strukturen anhand zeitaufgelöster linearer und nichtlinearer optischer Femtosekundenspektroskopie. Der lineare magneto- optische Kerr-Effekt (MOKE) und die magnetisch induzierte Erzeugung der zweiten Harmonischen (mSHG) wurden verwendet, um lichtinduzierte Spindynamik in hoch angeregten Zuständen der Materie mit 20 Femtosekunden (fs) Zeitauflösung zu untersuchen, was den Zeitskalen zugrundeliegender Elementarprozesse in Metallen entspricht. Der Spintransfer von einem Ferromagneten zu einem Edelmetall, oder von einem Ferromagneten zum anderen Ferromagneten mittels HC-Transport durch eine nichtmagnetische Zwischenschicht hindurch ist von besonderem Interesse in dieser Arbeit. Untersuchungen dieser Effekte sind von großer Bedeutung für das Verständnis der ultraschnellen Spindynamik, und die gewonnenen Erkenntnisse haben möglicherweise einen großen Einfluss auf zukünftige Spintronik-Geräte. Als Modellsysteme wurden epitaktische Au/Fe/MgO(001) und Fe/Au/Fe/MgO(001) Strukturen verwendet, wobei im letztgenannten Fall eine Fe-Schicht als Spinemitter und die andere Fe- Schicht als Spinkollektor dient. Als erster Schritt zum Verständnis des Spin- Transfers in metallischen MLs, wurde der HC Transport in einfachen Zweischicht-Au/Fe/MgO(001)-strukturen untersucht. Es wurde gezeigt, dass die optische Anregung von Fe zur Erzeugung eines Spin-Stroms führt, der von der ferromagnetischen Schicht in die nicht-magnetische Schicht fließt. Dieses Phänomen ist ein Analogon zum Spin-Seebeck-Effekt, wobei in diesem Fall der Spin-Strom in Gold von nicht-gleichgewichts HCs dominiert wird, die sich im quasi-ballistichen Regime bewegen. Die quantitative Analyse der MOKE Signalen, die von der Fe-Seite der Au/Fe/MgO(001)-Strukturen mit unterschiedlichen Fe- Dicken gemessen wurden, zeigt den bemerkbaren Beitrag des HC-Transports zur ultraschnellen Entmagnetisierung des Fe-Films, gefolgt von einer vorübergehenden Magnetisierung der Au-Schicht, die zusätzlich zum MOKE Signal beiträgt. Abschließend wurde Magnetisierungsdynamik, die in einem Ferromagneten mittels der Injektion von spinpolarisierten HCs induziert wird, an Dreischicht-Fe/Au/Fe/MgO(001)-strukturen untersucht. Aufgrund unterschiedlicher Koerzitiv-kräfte in den Fe-Filmen können die Magnetisierungen im Spinemitter und im Spinkollektor parallel, antiparallel oder orthogonal zueinander ausgerichtet werden. In der orthogonalen Ausrichtung zeigt es sich, dass der optisch erzeugte Spinstrompuls stehende Spinwellen im Spinkollektor erzeugt, die durch das räumlich inhomogen Spin- Transfer-Drehmoment (STT) induziert werden. Die Realisierung verschiedener gegenseitigen Orientierungen der äußeren Magnetfeldes und der Magnetisierungen im Spin-emitter und im Spin-kollektor ermöglicht es, das Signal des STT unabhängig vom Signal der laserinduzierter Erwärmung der Probe zu messen. Außerdem in der Analyse der mSHG-Antwort, die in verschiedenen magnetischen… Advisors/Committee Members: [email protected] (contact), [email protected] (contact), m (gender), Prof. Dr. Martin Wolf (firstReferee), Prof. Dr. Martin Weinelt (furtherReferee).

Subjects/Keywords: ultrafast spin transport; magnetization dynamics; nonlinear optics; optical pump-probe experiment; spin transfer torque.; 500 Naturwissenschaften und Mathematik::530 Physik::530 Physik; 500 Naturwissenschaften und Mathematik::530 Physik::538 Magnetismus

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Alekhin, A. (2016). Ultraschnelle Magnetisierungsdynamik durch Transport heißer Ladungträger. (Thesis). Freie Universität Berlin. Retrieved from http://dx.doi.org/10.17169/refubium-12139

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Alekhin, Alexandr. “Ultraschnelle Magnetisierungsdynamik durch Transport heißer Ladungträger.” 2016. Thesis, Freie Universität Berlin. Accessed April 11, 2021. http://dx.doi.org/10.17169/refubium-12139.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Alekhin, Alexandr. “Ultraschnelle Magnetisierungsdynamik durch Transport heißer Ladungträger.” 2016. Web. 11 Apr 2021.

Vancouver:

Alekhin A. Ultraschnelle Magnetisierungsdynamik durch Transport heißer Ladungträger. [Internet] [Thesis]. Freie Universität Berlin; 2016. [cited 2021 Apr 11]. Available from: http://dx.doi.org/10.17169/refubium-12139.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Alekhin A. Ultraschnelle Magnetisierungsdynamik durch Transport heißer Ladungträger. [Thesis]. Freie Universität Berlin; 2016. Available from: http://dx.doi.org/10.17169/refubium-12139

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Freie Universität Berlin

22. Pawłowska, Monika. Geformte Femtosekundenpulse zur kohärenten Kontrolle übertragen durch eine optische Faser im nichlinearen Pulsenergiebereich.

Degree: 2012, Freie Universität Berlin

URL: https://refubium.fu-berlin.de/handle/fub188/13032

► Ziel dieser Arbeit war es, die Möglichkeiten der Übertragung geformter, ultrakurzer Laserpulse durch eine optische Faser im nichlinearen Pulsenergiebereich und ihre Verwendung zur kohärenten Kotrolle… (more)

▼ Ziel dieser Arbeit war es, die Möglichkeiten der Übertragung geformter, ultrakurzer Laserpulse durch eine optische Faser im nichlinearen Pulsenergiebereich und ihre Verwendung zur kohärenten Kotrolle von Mehrphotonenprozessen zu erforschen. Als Ergebnis wurden zwei unterschiedliche Verfahren entwickelt, deren korrekte Funktionsweise experimentell nachgewiesen wurde. Viele Forschungsfelder, insbesondere die Biowissenschaften, können von der Übertragung geformter Femtosekundenlaserpulse profitieren. Allerdings werden ultrakurze Pulse in einer Glasfaser durch lineare und nichtlineare Effekte verzerrt, unter anderem durch chromatische Dispersion, Doppelbrechung und Selbstphasenmodulation. Diese schädlichen Effekte werden bereits bei Pulsenergien in der Größenordnung von 0,1 Nanojoule und Übertragung durch kurze Faserstücke signifikant. Daher ist die Kompensation dieser Effekte für alle Experimente mit geformten Laserpulsen in Fasern eine notwendige Voraussetzung. In dieser Arbeit werden zwei Ansätze zur koheränten Kontrolle mit geformten Pulsen, die durch eine Faser transportiert werden, präsentiert. Der erste Teil befasst sich mit der Anregung von Zweiphotonenübergängen mit phasengeformten Pulsen. Es wird gezeigt, dass die Form bestimmter antisymmetrischer spektraler Phasenfunktionen, in Verbindung mit einem Phasenoffset zur Kompensation der chromatischen Dispersion, trotz Selbstphasenmodulation teilweise erhalten bleibt. Dies ermöglicht es, Zweiphotonenübergänge effektiv und selektiv anzuregen, wobei jedoch die Selektivität mit zunehmender Pulsenergie abnimmt. Die aufgeführten Messergebnisse für Pulsenergien bis 1 Nanojoule werden durch die Simulationen der nichtlinearen Ausbreitung mittels numerische Lösung der nichtlinearen Schrödingergleichung bestätigt. Der andere Ansatz ist die Rückrechnung, eine Methode, die es ermöglicht, nach der Übertragung durch eine Faser beliebig geformte Pulse zu erhalten. Der Ansatz ist, im Gegensatz zum vorherigen, nicht auf Zweiphotonenübergänge beschränkt. Er erfordert jedoch eine genaue Kenntniss der linearen und nichtlinearen Eigenschaften der Faser. Deswegen ist der erste Schritt die Messung der Dispersion und des nichtlinearen Brechungsindizes. Anschließend wird die Ausbreitung der gewünschten Pulsform rückwärts durch die Faser numerisch simuliert, um die benötigte Eingangspulsform und die entsprechende Phasen- und Amplitudenmaske des Pulsformers zu berechnen. Die Methode wird durch Erzeugung und Vermessung von mehreren Serien phasen- und amplitudengeformten Pulse getestet. Zuletzt werden beide Methoden auf die selektive zweiphotonische Anregung von Molekülen in einer Lösung angewendet. Die für die Demonstration verwendeten Laserfarbstoffe haben breite, überlappende Absorptionsspektren, wie es auch für Luminophoren im biologischen bildgebenden Verfahren typisch ist. Es wird gezeigt, dass obwohl das Pulsspektrum nach der Faser schmaler wird, ein für ein bildgebendes Verfahren ausreichender Kontrast erreicht werden kann. Advisors/Committee Members: w (gender), Prof. Dr. Ludger Wöste (firstReferee), Prof. Dr. Vlasta Bonačić-Koutecký (furtherReferee).

Subjects/Keywords: ultrashort laser pulses; nonlinear optics; multiphoton processes; 500 Naturwissenschaften und Mathematik::530 Physik

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Pawłowska, M. (2012). Geformte Femtosekundenpulse zur kohärenten Kontrolle übertragen durch eine optische Faser im nichlinearen Pulsenergiebereich. (Thesis). Freie Universität Berlin. Retrieved from https://refubium.fu-berlin.de/handle/fub188/13032

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Pawłowska, Monika. “Geformte Femtosekundenpulse zur kohärenten Kontrolle übertragen durch eine optische Faser im nichlinearen Pulsenergiebereich.” 2012. Thesis, Freie Universität Berlin. Accessed April 11, 2021. https://refubium.fu-berlin.de/handle/fub188/13032.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Pawłowska, Monika. “Geformte Femtosekundenpulse zur kohärenten Kontrolle übertragen durch eine optische Faser im nichlinearen Pulsenergiebereich.” 2012. Web. 11 Apr 2021.

Vancouver:

Pawłowska M. Geformte Femtosekundenpulse zur kohärenten Kontrolle übertragen durch eine optische Faser im nichlinearen Pulsenergiebereich. [Internet] [Thesis]. Freie Universität Berlin; 2012. [cited 2021 Apr 11]. Available from: https://refubium.fu-berlin.de/handle/fub188/13032.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Pawłowska M. Geformte Femtosekundenpulse zur kohärenten Kontrolle übertragen durch eine optische Faser im nichlinearen Pulsenergiebereich. [Thesis]. Freie Universität Berlin; 2012. Available from: https://refubium.fu-berlin.de/handle/fub188/13032

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of New Mexico

23. Chase, Matthew. Memory Effects in Brownian Motion, Random Walks under Confining Potentials, and Relaxation of Quantum Systems.

Degree: Physics & Astronomy, 2016, University of New Mexico

URL: https://digitalrepository.unm.edu/phyc_etds/106

► This dissertation is a report on a number of distinct topics in the field of non-equilibrium statistical mechanics including the evolution of classical as… (more)

Subjects/Keywords: Astrophysics and Astronomy; Physics; Statistical, Nonlinear, and Soft Matter Physics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Chase, M. (2016). Memory Effects in Brownian Motion, Random Walks under Confining Potentials, and Relaxation of Quantum Systems. (Doctoral Dissertation). University of New Mexico. Retrieved from https://digitalrepository.unm.edu/phyc_etds/106

Chicago Manual of Style (16^th Edition):

Chase, Matthew. “Memory Effects in Brownian Motion, Random Walks under Confining Potentials, and Relaxation of Quantum Systems.” 2016. Doctoral Dissertation, University of New Mexico. Accessed April 11, 2021. https://digitalrepository.unm.edu/phyc_etds/106.

MLA Handbook (7^th Edition):

Chase, Matthew. “Memory Effects in Brownian Motion, Random Walks under Confining Potentials, and Relaxation of Quantum Systems.” 2016. Web. 11 Apr 2021.

Vancouver:

Chase M. Memory Effects in Brownian Motion, Random Walks under Confining Potentials, and Relaxation of Quantum Systems. [Internet] [Doctoral dissertation]. University of New Mexico; 2016. [cited 2021 Apr 11]. Available from: https://digitalrepository.unm.edu/phyc_etds/106.

Council of Science Editors:

Chase M. Memory Effects in Brownian Motion, Random Walks under Confining Potentials, and Relaxation of Quantum Systems. [Doctoral Dissertation]. University of New Mexico; 2016. Available from: https://digitalrepository.unm.edu/phyc_etds/106

Duke University

24. Shen, Qixin. Manipulation of Nonlinear Optical Processes in Plasmonic Nanogap Cavities .

Degree: 2020, Duke University

URL: http://hdl.handle.net/10161/21436

► Nonlinear generation of optical fields has enabled many exciting breakthroughs in light science such as nonlinear imaging, all-optical switching and supercontinuum generation. The intrinsic… (more)

▼ Nonlinear generation of optical fields has enabled many exciting breakthroughs in light science such as nonlinear imaging, all-optical switching and supercontinuum generation. The intrinsic nonlinear response from bulk materials is extremely weak and phase matching conditions need to be satisfied for efficient generation. Plasmonic structures have proven to be a promising platform to investigate nonlinear optics due to the capability to enhance and localize electromagnetic fields within subwavelength volumes beyond the diffraction limit. However, the origin of the large nonlinear response observed in the plasmonic structures is not fully understood and the investigations of nonlinear processes involving multiple excitation wavelengths are limited. Furthermore, simultaneous enhancement and precise manipulation of multiple nonlinear optical processes have not been experimentally demonstrated. In this dissertation, I describe a specific film-coupled plasmonic nanogap cavity structure consisting of arrays of nanoparticles separated from a metallic ground plane by an ultrathin dielectric layer. Polarization-dependent, dual-band and spatially-overlapped resonances are obtained with arrays of rectangle nanoparticles where the two resonances can be tuned independently. Highly efficient third harmonic generation (THG) is achieved by integrating dielectric materials in plasmonic nanogap cavities, resulting in more than six orders of magnitude enhancement in the THG response compared with a bare gold film. Utilizing comprehensive spectral analysis and finite-element simulation, it is concluded that the main contributing nonlinear source is dielectric material in the gap. Furthermore, I demonstrate simultaneous enhancement of three nonlinear responses from THG, sum frequency generation (SFG) and four wave mixing (FWM) by integrating 1-7 nm Al2O3 layer in the nanocavities formed by a gold ground plane and silver nanorectangles. Enhancement up to 106-fold for both THG and FWM and 104-fold for SFG is achieved when the excitation wavelengths overlap with the resonance wavelengths from transverse and longitudinal modes of the nanorectangles. Precise control of the relative strength of these nonlinear responses is demonstrated either actively by varying the ratio between excitation powers or passively by changing the Al2O3 gap thickness. Moreover, a metasurface-based efficient frequency mixer is realized utilizing diamond and a novel polymer transfer process is employed for creating nanoparticle arrays. This new insight into the nonlinear response in ultrathin gaps between metals is expected to be promising for both the fundamental understanding of nonlinear optics at the deep nanoscale and efficient on-chip nonlinear devices such as ultrafast optical switching and entangled photon sources. The capability to precisely manipulate nonlinear optical processes at the nanoscale could find important applications for nonlinear imaging and quantum communication. Advisors/Committee Members: Mikkelsen, Maiken H (advisor).

Subjects/Keywords: Physics; Nanoscience; Quantum physics; Frequency conversion; Metasurface; Nonlinear optics; Plasmonics; Tuning

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Shen, Q. (2020). Manipulation of Nonlinear Optical Processes in Plasmonic Nanogap Cavities . (Thesis). Duke University. Retrieved from http://hdl.handle.net/10161/21436

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Shen, Qixin. “Manipulation of Nonlinear Optical Processes in Plasmonic Nanogap Cavities .” 2020. Thesis, Duke University. Accessed April 11, 2021. http://hdl.handle.net/10161/21436.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Shen, Qixin. “Manipulation of Nonlinear Optical Processes in Plasmonic Nanogap Cavities .” 2020. Web. 11 Apr 2021.

Vancouver:

Shen Q. Manipulation of Nonlinear Optical Processes in Plasmonic Nanogap Cavities . [Internet] [Thesis]. Duke University; 2020. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10161/21436.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Shen Q. Manipulation of Nonlinear Optical Processes in Plasmonic Nanogap Cavities . [Thesis]. Duke University; 2020. Available from: http://hdl.handle.net/10161/21436

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Colorado

25. Cole, Daniel C. Beyond Modelocking: High Repetition-Rate Frequency Combs Derived from a Continuous-Wave Laser.

Degree: PhD, 2018, University of Colorado

URL: https://scholar.colorado.edu/phys_gradetds/236

► Optical frequency combs based on modelocked lasers have revolutionized precision metrology by facilitating measurements of optical frequencies, with implications both for fundamental scientific questions and… (more)

▼ Optical frequency combs based on modelocked lasers have revolutionized precision metrology by facilitating measurements of optical frequencies, with implications both for fundamental scientific questions and for applications such as fast, broadband spectroscopy. In this thesis, I describe advances in the generation of frequency combs without modelocking in platforms with smaller footprints and higher repetition rates, with the ultimate goal of bringing frequency combs to new applications in a chip-integrated package. I discuss two approaches for comb generation: parametric frequency conversion in Kerr microresonators and active electro-optic modulation of a continuous-wave laser. After introducing microresonator-based frequency combs (microcombs), I discuss two specific developments in microcomb technology: First, I describe a new, extremely reliable method for generation of soliton pulses through the use of a phase-modulated pump laser. This technique eliminates the dependence on initial conditions that was formerly a universal feature of these experiments, presenting a solution to a significant technical barrier to the practical application of microcombs. Second, I present observations of <i>soliton crystal</i> states with highly structured `fingerprint' optical spectra that correspond to ordered pulse trains exhibiting crystallographic defects. These pulse trains arise through interaction of solitons with avoided mode crossings in the resonator spectrum. I also discuss generation of Kerr soliton combs in the Fabry-Perot (FP) geometry, with a focus on the differences between the FP geometry and the ring geometry that has been the choice of most experimenters to date. Next, I discuss combs based on electro-optic modulation. I introduce the operational principle, and then describe the first self-referencing of a frequency comb of this kind and a proof-of-principle application experiment. Finally, I discuss a technique for reducing the repetition rate of a high repetition-rate frequency comb. This will be a useful post-processing step for applications that require either high pulse energy, such as nonlinear spectral broadening for ƒ-2ƒ self-referencing, or fine spectral resolution. Advisors/Committee Members: Scott A. Diddams, Scott B. Papp, Adam Kaufman, Greg Rieker, Juliet Gopinath.

Subjects/Keywords: frequency comb; microresonator-based frequency combs; nonlinear dynamics; nonlinear optics; photonics; Optics; Physics

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APA (6^th Edition):

Cole, D. C. (2018). Beyond Modelocking: High Repetition-Rate Frequency Combs Derived from a Continuous-Wave Laser. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/phys_gradetds/236

Chicago Manual of Style (16^th Edition):

Cole, Daniel C. “Beyond Modelocking: High Repetition-Rate Frequency Combs Derived from a Continuous-Wave Laser.” 2018. Doctoral Dissertation, University of Colorado. Accessed April 11, 2021. https://scholar.colorado.edu/phys_gradetds/236.

MLA Handbook (7^th Edition):

Cole, Daniel C. “Beyond Modelocking: High Repetition-Rate Frequency Combs Derived from a Continuous-Wave Laser.” 2018. Web. 11 Apr 2021.

Vancouver:

Cole DC. Beyond Modelocking: High Repetition-Rate Frequency Combs Derived from a Continuous-Wave Laser. [Internet] [Doctoral dissertation]. University of Colorado; 2018. [cited 2021 Apr 11]. Available from: https://scholar.colorado.edu/phys_gradetds/236.

Council of Science Editors:

Cole DC. Beyond Modelocking: High Repetition-Rate Frequency Combs Derived from a Continuous-Wave Laser. [Doctoral Dissertation]. University of Colorado; 2018. Available from: https://scholar.colorado.edu/phys_gradetds/236

26. Kappler, Julian. Memory effects in soft matter.

Degree: 2018, Freie Universität Berlin

URL: http://dx.doi.org/10.17169/refubium-302

► In biologischen und anderen nicht isolierten Systemen besteht typischerweise eine Kopplung zwischen der Umgebung und der Reaktionskoordinate, welche die betrachtete physikalische Fragestellung charakterisiert. Um diese… (more)

▼ In biologischen und anderen nicht isolierten Systemen besteht typischerweise eine Kopplung zwischen der Umgebung und der Reaktionskoordinate, welche die betrachtete physikalische Fragestellung charakterisiert. Um diese Kopplung bei der Beschreibung der Reaktionskoordinate zu berücksichtigen sind effektive Modelle notwendig. Falls die Zeitskalen der Dynamik von Reaktionskoordinate und Umgebung nicht entkoppeln, treten Memoryeffekte auf. In der vorliegenden Dissertation werden mehrere Systeme aus dem Bereich der biologischen Physik, für die Memoryeffekte relevant sind, untersucht. Im ersten Teil untersuchen wir die Zyklisierung von Polymeren anhand von Langevinsimulationen verschiedener Modelle für die Hauptkette (Backbone). Dabei betrachten wir sowohl Phantomketten als auch selbstvermeidenende kollabierte Ketten. Wir finden, dass Details des Backbone-Modells das dynamische Verhalten des End-zu-End-Abstands nicht qualitativ beeinflussen, Selbstvermeidung jedoch schon. Sowohl die aus unseren Simulationen berechneten Memorykernels für den End-zu-End-Abstand als auch die aus unseren Simulationen berechneten Zyklisierungszeiten werden durch auf Flory-Theorie basierenden Skalenargumenten erklärt. Der zweite Teil untersucht die mittlere für einen Barrierenübergang benötigte Zeit für nicht-Markovsche Dynamik mithilfe von Langevinsimulationen. Für exponentielles Memory bestätigen wir bekanntes asymptotisches Skalenverhalten und identifizieren einen neuen Parameterbereich in dem Memoryeffekte zu einer Beschleunigung des Barrierenübergangs führen, was wir durch eine analytische Herleitung ergänzen. Mithilfe einer heuristischen Formel charakterisieren wir das Verhalten der Barrierenübergangszeit als Funktion der Systemparameter. Für bi-exponentielles Memory finden wir, dass sich die Barrierenübergangszeit durch die heuristische Formel für exponentielles Memory mit effektiven Parametern berechnen lässt. Die effektiven Parameter werden von der kürzeren der beiden Memoryzeiten dominiert, was wir durch ein analytisches Argument untermauern. Im dritten Teil beschäftigen wir uns mit Oberflächenwellen. Wir leiten eine Gleichung für lineare Oberflächenwellen auf viskoelastischen Medien mit viskoelastischer Grenzfläche unter dem Einfluss der Gravitationskraft her. Wir veranschaulichen die Beziehungen zwischen den bekannten Rayleigh-, Kapillar-Gravitations-, und Lucassenwellen, und finden eine neue Wellenlösung, welche an einer reinen Luft-Wasser-Grenzfläche existiert. Weiterhin leiten wir eine nichtlineare Gleichung für Kompressionswellen in elastischen Grenzflächen auf viskosen Flüssigkeiten her. Die nichtlinearen Effekte entstammen der Abhängigkeit der Grenzflächenkompressibilität von der lokalen Kompression. Unsere Gleichung enthält Memoryeffekte, welche die frequenzabhängige Eindringtiefe der Oberflächenwelle in die Flüssigkeit widerspiegeln. Numerische Lösungen unserer Theorie reproduzieren die Hauptmerkmale von in Phospholipid-Monolayern an der Luft-Wasser Grenzfläche beobachteten Oberflächenwellen. Advisors/Committee Members: male (gender), Netz, Roland R. (firstReferee), Imhof, Petra (furtherReferee).

Subjects/Keywords: Fluid dynamics; Surface waves; Nonlinear waves; Non-Markovian dynamics; Stochastic processes; Memory effects; Barrier crossing; Polymer dynamics; 500 Naturwissenschaften und Mathematik::530 Physik::530 Physik

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APA (6^th Edition):

Kappler, J. (2018). Memory effects in soft matter. (Thesis). Freie Universität Berlin. Retrieved from http://dx.doi.org/10.17169/refubium-302

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kappler, Julian. “Memory effects in soft matter.” 2018. Thesis, Freie Universität Berlin. Accessed April 11, 2021. http://dx.doi.org/10.17169/refubium-302.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kappler, Julian. “Memory effects in soft matter.” 2018. Web. 11 Apr 2021.

Vancouver:

Kappler J. Memory effects in soft matter. [Internet] [Thesis]. Freie Universität Berlin; 2018. [cited 2021 Apr 11]. Available from: http://dx.doi.org/10.17169/refubium-302.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kappler J. Memory effects in soft matter. [Thesis]. Freie Universität Berlin; 2018. Available from: http://dx.doi.org/10.17169/refubium-302

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of California – Berkeley

27. Byrnes, Steven John Feinman. Studies in Optics and Optoelectronics.

Degree: Physics, 2012, University of California – Berkeley

URL: http://www.escholarship.org/uc/item/0k0918t7

► This thesis will detail four projects aimed at understanding and applying the principles of optics and optoelectronics.In Chapter 1, we describe phase-sensitive sum-frequency vibrational spectroscopy… (more)

▼ This thesis will detail four projects aimed at understanding and applying the principles of optics and optoelectronics.In Chapter 1, we describe phase-sensitive sum-frequency vibrational spectroscopy (PS-SFVS), a nonlinear optical technique that can probe the molecular structure of the top few monolayers of a liquid-vapor interface. We use this technique to investigate the air-water interface, using a number of water samples with different dissolved salts. The information is used to draw inferences about the surface propensity of these salt ions—information that can shed light on both atmospheric chemistry and water solvation theory. We also give a detailed description of the experimental methodology for PS-SFVS, its rationale, and the issues that can arise.PS-SFVS measurements, such as those described in Chapter 1, can be fruitfully used by comparing them with the signal predicted by molecular simulation. However, the relationship between a molecular configuration and its nonlinear optical signal is not thoroughly understood in the theoretical chemistry community. In particular, the procedures used in the literature to predict an PS-SFVS signal within a molecular simulation have been ambiguous, depending on arbitrary parameters. In Chapter 2, we review PS-SFVS theory at a fundamental level, then map it to modern simulation methods, thereby explaining the ambiguities as consequences of improper truncation of a multipole expansion. A molecular-dynamics simulation of the water-air interface is used as an example, illustrating the consequences of different simulation methods and suggesting which ones should be most accurate.Chapter 3 explores a different aspect of nonlinear optics: The compression and characterization of ultrafast pulses of light. These pulses have been explored for a variety of scientific and technological applications. Ideally, an optical pulse can be reduced in duration up to the limit imposed by its spectral bandwidth via the uncertainty principle. However, the presence of "nonlinear chirp" (different frequencies arriving at different times in a nonlinear fashion), which is especially common in mode-locked fiber lasers, can be a major factor preventing the shortening of a pulse. We describe a new technology, a type of patterned glass phase plate, that promises to reduce nonlinear chirp in a convenient, adjustable, inexpensive, and high-throughput manner. After showing simulations, we describe how we made the plate, and then how we used frequency-resolved optical gating (FROG) to watch the plate change the duration and shape of a pulse from a fiber laser.Finally, Chapter 4 discusses a new architecture for solar cells that uses the field effect, rather than the traditional p-n junction, to separate charge. This could be advantageous for semiconductor materials that are difficult to dope to both p- and n-type, such as oxides, sulfides, and nanoparticles. We discuss the underlying physics and rule-of-thumb design principles, along with both finite element simulations and experimental…

Subjects/Keywords: Optics; Condensed matter physics; Physics; Air-water interface; Field-effect photovoltaics; Nonlinear chirp; Nonlinear optics; Sum-frequency generation; Unconventional semiconductors

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APA (6^th Edition):

Byrnes, S. J. F. (2012). Studies in Optics and Optoelectronics. (Thesis). University of California – Berkeley. Retrieved from http://www.escholarship.org/uc/item/0k0918t7

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Byrnes, Steven John Feinman. “Studies in Optics and Optoelectronics.” 2012. Thesis, University of California – Berkeley. Accessed April 11, 2021. http://www.escholarship.org/uc/item/0k0918t7.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Byrnes, Steven John Feinman. “Studies in Optics and Optoelectronics.” 2012. Web. 11 Apr 2021.

Vancouver:

Byrnes SJF. Studies in Optics and Optoelectronics. [Internet] [Thesis]. University of California – Berkeley; 2012. [cited 2021 Apr 11]. Available from: http://www.escholarship.org/uc/item/0k0918t7.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Byrnes SJF. Studies in Optics and Optoelectronics. [Thesis]. University of California – Berkeley; 2012. Available from: http://www.escholarship.org/uc/item/0k0918t7

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Maryland

28. Chen, Yu-hsin. The ultrafast nonlinear response of air molecules and its effect on femtosecond laser plasma filaments in atmosphere.

Degree: Electrical Engineering, 2011, University of Maryland

URL: http://hdl.handle.net/1903/11527

► The nonlinear propagation of an intense ultrafast laser pulse in atmosphere or other gas media leads to filamentation, a phenomenon useful for applications such as… (more)

▼ The nonlinear propagation of an intense ultrafast laser pulse in atmosphere or other gas media leads to filamentation, a phenomenon useful for applications such as remote sensing, spectral broadening and shaping of ultrashort laser pulses, terahertz generation, and guiding of electrical discharges. Axially extended optical filaments result from the dynamic balance between nonlinear self-focusing in the gas and refraction from the free electron distribution generated by laser ionization. In the air, self-focusing is caused by two nonlinear optical processes: (1) the nearly-instantaneous, electronic response owing to the distortion of electron orbitals, and (2) the delayed, orientational effect due to the torque applied by the laser field on the molecules with anisotropic polarizability. To study their roles in filamentary propagation as well as influences on plasma generation in atmosphere, these effects were experimentally examined by a sensitive, space- and time-resolved technique based on single-shot supercontinuum spectral interferometry (SSSI), which is capable of measuring ultrafast refractive index shift in the optical medium. A proof-of-principle experiment was first performed in optical glass and argon gas, showing good agreement between the laser pulse shape and the refractive index temporal evolution owing to pure instantaneous n₂ effect. Then the delayed occurrence of the molecular alignment in the temporal vicinity of the femtosecond laser pulse, as well as the subsequent periodic “alignment revivals” due to the coherently excited rotational wavepacket were measured in various linear gas molecules, and the results agreed well with quantum perturbation theory. It was found that the magnitude of orientational response is much higher than the electronic response in N₂ and O₂, which implies that the molecular alignment is the dominant nonlinear effect in atmospheric propagation when the pulse duration is longer than ∼40 fs, the rotational response timescale of air molecules. Realizing the possibility of manipulating plasma generation by aligning air molecules, the molecular orientational effect was further investigated by a technique developed to directly measure, for the first time, the radial and axial plasma density in a meter-long filament. The experiment was performed using both ∼40 fs and ∼120 fs laser pulse durations while keeping the peak power fixed under various focusing conditions, and the alignment-assisted filamenation with ∼2–3 times plasma density and much longer axial length was consistently observed with the longer pulse, which experienced larger refractive index shift and thus stronger self-focusing. Simulations reproduced the axial electron density measurements well for both long and short pulse durations, when using a peak magnitude of instantaneous response as <15% of the rotational response. Advisors/Committee Members: Milchberg, Howard M (advisor).

Subjects/Keywords: Plasma Physics; Optics; Molecular Physics; filamentation; laser-induced molecular alignment; nonlinear propagation; plasma density measurement; spectral interferometry; ultrafast nonlinear optics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Chen, Y. (2011). The ultrafast nonlinear response of air molecules and its effect on femtosecond laser plasma filaments in atmosphere. (Thesis). University of Maryland. Retrieved from http://hdl.handle.net/1903/11527

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Chen, Yu-hsin. “The ultrafast nonlinear response of air molecules and its effect on femtosecond laser plasma filaments in atmosphere.” 2011. Thesis, University of Maryland. Accessed April 11, 2021. http://hdl.handle.net/1903/11527.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Chen, Yu-hsin. “The ultrafast nonlinear response of air molecules and its effect on femtosecond laser plasma filaments in atmosphere.” 2011. Web. 11 Apr 2021.

Vancouver:

Chen Y. The ultrafast nonlinear response of air molecules and its effect on femtosecond laser plasma filaments in atmosphere. [Internet] [Thesis]. University of Maryland; 2011. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/1903/11527.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Chen Y. The ultrafast nonlinear response of air molecules and its effect on femtosecond laser plasma filaments in atmosphere. [Thesis]. University of Maryland; 2011. Available from: http://hdl.handle.net/1903/11527

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Freie Universität Berlin

29. Patas, Alexander. Kontrolle multiphotonischer Prozesse mittels parametrisch geformter ultrakurzer Laserpulse.

Degree: 2017, Freie Universität Berlin

URL: http://dx.doi.org/10.17169/refubium-9246

► Das Ziel dieser Arbeit besteht darin, Möglichkeiten der parametrischen Pulsformung, mit besonderem Blick auf die Multiphotonen-Fluoreszenzanregung und Filamentation, durch Laserpulse aufzuzeigen. Zudem werden Verfahren vorgestellt,… (more)

▼ Das Ziel dieser Arbeit besteht darin, Möglichkeiten der parametrischen Pulsformung, mit besonderem Blick auf die Multiphotonen-Fluoreszenzanregung und Filamentation, durch Laserpulse aufzuzeigen. Zudem werden Verfahren vorgestellt, die für die Anwendung von Pulsformung in medizinischer und biologischer Bildgebung von Vorteil sind. Hierfür wurden zunächst verschiedene parametrische Phasenfunktionen daraufhin untersucht, ob sie zwei Farbstoffe selektiv, nach Transmission durch eine Hohlkernfaser, zweiphotonisch anregen können. Dies bestätigt, dass geformte Laserpulse für selektive Anregung von Farbstoffen, z.b. in endoskopischen Anwendungen, verwendet werden können. Parametrische Phasenfunktionen werden vorgestellt, die eine Kontrolle der Multiphotonen-Anregung durch Veränderung nur eines Parameters ermöglichen. Simulationen wurden durchgeführt um die Grenzen der Kontrolle des Zweiphotonen-Prozesses aufzuzeigen. Dabei wurde deutlich, dass geformte Pulse, die größere Kontraste zwischen den Fluorsezenzfarbstoffen erreichen, immer mit einer reduzierten Fluoreszenz-Intensität einhergehen. Zusätzlich zu der Hohlkernfaser wurde eine neuartige Kagomé-Faser untersucht, welche besonders geeignet ist Pulse hoher Intensität ohne den störenden Einfluss von nichtlinearen Effekten zu leiten. Selbst polarisationsgeformte Pulse finden in solch einem Szenario Anwendung. Es wurde gezeigt, dass ein polarisationsgeformter Doppelpuls, nach Transmission durch eine Kagomé-Faser, verwendet werden kann um anistrop fluoreszierende Farbstoffe polarisationsabhängig anzuregen. Hierfür wurden zwei senkrechte phasengeformte Laserpulse erzeugt, die je für die Fluoreszenz eines Farbstoffes optimiert sind. Je nach Orientierung eines Polarisationsfilters ließ sich somit zwischen stärkerer Fluoreszenz des einen oder anderen Farbstoffes wählen. Weiterhin wurde die Kontrolle der Dreiphotonen-Anregung anhand von der Aminosäure LTryptophan in Wasser demonstriert. Auch dieser Prozess kann durch geformte Pulse beeinflusst werden, jedoch zeigt sich schnell, dass bei den hierfür benötigten Intensitäten nichtlineare Effekte einen signifikanten Einfluss auf die Entwicklung des Spektrums in der Küvette haben. Simulationen der Puls- Propagation in der Küvette, welche die Intensitätsentwicklung im Gauß-Fokus berücksichtigen, gaben Aufschluss auf die, hauptsächlich durch Selbstphasenmodulation bestimmten, spektralen Veränderungen. Das sich damit ebenfalls verändernde Dreiphotonen- Spektrum konnte durch Wahl der Pulsform so verändert werden, dass der Kontrast zwischen zwei Farbstoffen noch weiter verbessert werden kann. In einer dritten Reihe an Experimenten wurde untersucht inwieweit parametrisch geformte Pulse Einfluss auf das Weißlichtspektrum nach einem Filament haben. Pulse wurden mit einer neuartigen Methode zur Phasenbestimmung so vorkompensiert, dass sie zu Beginn des Filaments eine gewünschte Pulsform erreichten. Zweidimensionale, zylindrische Simulationen der Puls-Propagation unter Berücksichtigung von nichtlinearen Effekten, Dispersion, Plasma-Wechselwirkung… Advisors/Committee Members: m (gender), Prof. Dr. Ludger Wöste (firstReferee), Prof. Dr. Karsten Heyne (furtherReferee).

Subjects/Keywords: coherent control; laser pulse shaping; nonlinear optics; filamentation; ultrashort laser pulses; 500 Naturwissenschaften und Mathematik::530 Physik

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Patas, A. (2017). Kontrolle multiphotonischer Prozesse mittels parametrisch geformter ultrakurzer Laserpulse. (Thesis). Freie Universität Berlin. Retrieved from http://dx.doi.org/10.17169/refubium-9246

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Patas, Alexander. “Kontrolle multiphotonischer Prozesse mittels parametrisch geformter ultrakurzer Laserpulse.” 2017. Thesis, Freie Universität Berlin. Accessed April 11, 2021. http://dx.doi.org/10.17169/refubium-9246.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Patas, Alexander. “Kontrolle multiphotonischer Prozesse mittels parametrisch geformter ultrakurzer Laserpulse.” 2017. Web. 11 Apr 2021.

Vancouver:

Patas A. Kontrolle multiphotonischer Prozesse mittels parametrisch geformter ultrakurzer Laserpulse. [Internet] [Thesis]. Freie Universität Berlin; 2017. [cited 2021 Apr 11]. Available from: http://dx.doi.org/10.17169/refubium-9246.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Patas A. Kontrolle multiphotonischer Prozesse mittels parametrisch geformter ultrakurzer Laserpulse. [Thesis]. Freie Universität Berlin; 2017. Available from: http://dx.doi.org/10.17169/refubium-9246

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Freie Universität Berlin

30. von Hansen, Yann. Stochastische Dynamik in biomolekularen Systemen.

Degree: 2014, Freie Universität Berlin

URL: http://dx.doi.org/10.17169/refubium-6142

► Stochastische Konzepte sind unentbehrlich zum Verständnis der fluktuierenden Dynamik von biologischen Systemen auf der Mikroskala. Die Entwicklung von Methoden, um die physikalisch relevanten Informationen zuverlässig… (more)

▼ Stochastische Konzepte sind unentbehrlich zum Verständnis der fluktuierenden Dynamik von biologischen Systemen auf der Mikroskala. Die Entwicklung von Methoden, um die physikalisch relevanten Informationen zuverlässig und effizient aus stochastischen Signalen zu extrahieren, stellt daher eine große Herausforderung in der aktuellen theoretischen biophysikalischen Forschung dar. Gegenstand der vorliegenden Arbeit ist die theoretische Untersuchung der fluktuierenden Dynamik in verschiedenen Systemen. Erstens werden die Diffusionsbewegung von Wassermolekülen und die Konformationsdynamik eines kurzen Peptids, basierend auf den Trajektorien atomistischer Simulationen, untersucht. Wir entdecken eine ausgeprägte Diffusionsanisotropie der Wassermoleküle im Bulk und ein bemerkenswert strukturiertes Diffusivitätsprofil für die Relativbewegung von Paaren von Wassermolekülen. In der Nähe von Lipidmembranen ist die Wasserdiffusion unterdrückt und unterscheidet sich aufgrund der Kopplung von Lipid- und Wassermolekülen deutlich von der Diffusivität an festen Oberflächen. Für das untersuchte alpha-helikale Peptid hängen aufgrund spezifischer Wechselwirkungen zwischen Ionen und Peptid sowohl die freie Energielandschaft als auch das zur Konformationsdynamik zugehörige Diffusivitätsprofil maßgeblich von der Art der Solute ab. Zweitens werden verbesserte Methoden zur quantitativen Analyse und Vorhersage der fluktuierenden Signale in biophysikalischen Experimenten und Simulationen entwickelt. Wir modellieren die Signalverarbeitung in Experimenten mit optischen Pinzetten und entwickeln ein Bayessches Inferenzverfahren für die Analyse von Selbst- und Kreuzspektren der aufgezeichneten Zeitreihen, was eine quantitative spektrale Auswertung von Einzelmolekülexperimenten ermöglicht. Der grundsätzliche Einfluss von Nichtlinearitäten in den Bewegungsgleichungen auf die resultierenden Fluktuationen wird untersucht, indem typische dynamische Observablen in Potenzen der thermischen Rauschintensität entwickelt werden. Die eingenommene Einzeltrajektorienperspektive erlaubt zudem, eine Korrektur erster Ordnung für eine kürzlich eingeführte dynamische Konvolutionstheorie herzuleiten. Drittens dienen Brownsche-Dynamik-Simulationen und dynamische Molekularfeldtheorie zur Untersuchung der viskoelastischen Eigenschaften einzelner sowie vernetzter semiflexibler Filamente. Wir stellen abhängig von der dynamischen Observablen einen ausgeprägten Einfluss hydrodynamischer Wechselwirkungen oder der mechanischen Eigenschaften der Filamente auf die Gleichgewichtsfluktuationen einzelner Polymere fest. Schließlich werden, basierend auf den anisotropen Antwortfunktionen einzelner Polymere, die rheologischen Eigenschaften von ausgedehnten Netzwerken semiflexibler Polymere unter Verwendung einer auf zwei Dimensionen verallgemeinerten dynamischen Konvolutionstheorie untersucht. Advisors/Committee Members: m (gender), Prof. Dr. Roland R. Netz (firstReferee), Prof. Dr. Igor M. Sokolov (furtherReferee).

Subjects/Keywords: thermal fluctuations; diffusion; water dynamics; optical tweezers; nonlinear systems; semiflexible polymers; viscoelasticity; 500 Naturwissenschaften und Mathematik::530 Physik

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APA (6^th Edition):

von Hansen, Y. (2014). Stochastische Dynamik in biomolekularen Systemen. (Thesis). Freie Universität Berlin. Retrieved from http://dx.doi.org/10.17169/refubium-6142

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

von Hansen, Yann. “Stochastische Dynamik in biomolekularen Systemen.” 2014. Thesis, Freie Universität Berlin. Accessed April 11, 2021. http://dx.doi.org/10.17169/refubium-6142.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

von Hansen, Yann. “Stochastische Dynamik in biomolekularen Systemen.” 2014. Web. 11 Apr 2021.

Vancouver:

von Hansen Y. Stochastische Dynamik in biomolekularen Systemen. [Internet] [Thesis]. Freie Universität Berlin; 2014. [cited 2021 Apr 11]. Available from: http://dx.doi.org/10.17169/refubium-6142.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

von Hansen Y. Stochastische Dynamik in biomolekularen Systemen. [Thesis]. Freie Universität Berlin; 2014. Available from: http://dx.doi.org/10.17169/refubium-6142

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Open Access Theses and Dissertations