You searched for subject:( Mid infrared).
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Cornell University
1.
Portnoy, Matilde.
REFRENCE METHOD AND CALIBRATION SAMPLES FOR MILK UREA NITROGEN DETERMINATION USING MID-INFRARED.
Degree: M.S., Food Science and Technology, Food Science and Technology, 2019, Cornell University
URL: http://hdl.handle.net/1813/70059 
► Milk urea nitrogen (MUN) is one of the minor milk components (i.e. in low concentration) that can be determined by PLS models using milk mid-infrared…
(more)
▼ Milk urea nitrogen (MUN) is one of the minor milk components (i.e. in low concentration) that can be determined by PLS models using milk
mid-
infrared (MIR) instruments. MUN, even though in such low concentrations in milk, is used in dairy herd improvement and payment testing laboratories to gain a more clear understanding of the efficiency of nitrogen utilization by ruminants for various purposes, such as protein feeding management and monitoring physiological consequences on the dairy cows (e.g. improved reproductive efficiency). In addition, MUN testing is used to help lower dairy farm environmental impacts due to excretion of urea in urine of dairy cows. Therefore, accurate MUN concentration information in a timely manner is of great importance for dairy herd feeding and reproduction management. Milk MIR instruments provide a method to measure MUN using PLS models. However, calibration samples and an accurate and reliable reference chemical method to obtain reference calibration values are needed for the measurement of MUN with milk MIR instruments. The objectives of the current study were to add reference chemistry for a milk urea nitrogen (MUN) parameter with a wide, well-distributed range of MUN concentrations to the modified milk calibration sample set made every four weeks at Cornell University, while maintaining orthogonality with variation in fat, protein, and lactose concentrations and to determine the within and between lab variation in an enzymatic spectrophotometric chemical reference method for MUN determination on the modified milk calibration samples and degree of uncertainty in MUN reference values. Changes in the modified milk samples’ formulation procedure were performed to include the desired range of MUN concentrations, particularly in the ultrafiltration processing step. An enzymatic spectrophotometric reference method was used to obtain MUN reference values for the set of samples formulated. The MUN enzymatic spectrophotometric method was also used to obtain MUN concentrations for a set of individual-farm bulk tank raw milk samples. The within (RSDr) and between lab variation (RSDR) in the reference values for MUN were < 1%, and the average expanded analytical uncertainty for the mean MUN value of the 14-sample calibration set was 16.15 mg/100 g milk +/- 0.09 mg/100 g milk. Another objective was to use the modified milk calibration samples to evaluate and improve the performance of PLS models for prediction of MUN. The orthogonal sample set was used to determine when a PLS model did not correctly model out the background variation in fat, protein or lactose. The calculation and application of an intercorrection factor to eliminate that effect was shown to improve the model performance (i.e., 50 % reduction in standard deviation of the differences between instrument predictions and reference chemistry values for MUN).
Advisors/Committee Members: Barbano, David Mark (chair), Wolczanski, Peter Thomas (committee member).
Subjects/Keywords: Mid-infrared; Milk urea nitrogen
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APA (6th Edition):
Portnoy, M. (2019). REFRENCE METHOD AND CALIBRATION SAMPLES FOR MILK UREA NITROGEN DETERMINATION USING MID-INFRARED. (Masters Thesis). Cornell University. Retrieved from http://hdl.handle.net/1813/70059
Chicago Manual of Style (16th Edition):
Portnoy, Matilde. “REFRENCE METHOD AND CALIBRATION SAMPLES FOR MILK UREA NITROGEN DETERMINATION USING MID-INFRARED.” 2019. Masters Thesis, Cornell University. Accessed January 20, 2021.
http://hdl.handle.net/1813/70059.
MLA Handbook (7th Edition):
Portnoy, Matilde. “REFRENCE METHOD AND CALIBRATION SAMPLES FOR MILK UREA NITROGEN DETERMINATION USING MID-INFRARED.” 2019. Web. 20 Jan 2021.
Vancouver:
Portnoy M. REFRENCE METHOD AND CALIBRATION SAMPLES FOR MILK UREA NITROGEN DETERMINATION USING MID-INFRARED. [Internet] [Masters thesis]. Cornell University; 2019. [cited 2021 Jan 20].
Available from: http://hdl.handle.net/1813/70059.
Council of Science Editors:
Portnoy M. REFRENCE METHOD AND CALIBRATION SAMPLES FOR MILK UREA NITROGEN DETERMINATION USING MID-INFRARED. [Masters Thesis]. Cornell University; 2019. Available from: http://hdl.handle.net/1813/70059
University of Exeter
2.
Shi, C.
Metasurface based mid-infrared devices.
Degree: PhD, 2019, University of Exeter
URL: http://hdl.handle.net/10871/39300
► The development of compact, efficient, and powerful mid-infrared devices is mainly restrained by the limited choice of materials due to the high loss of conventional…
(more)
▼ The development of compact, efficient, and powerful mid-infrared devices is mainly restrained by the limited choice of materials due to the high loss of conventional optical materials in the mid-infrared range. The aim of this work was to find alternative novel materials which would enable the realization of devices with smaller size while maintaining its functionality. Metasurface and graphene have emerged as promising materials which can help us to manipulate the infrared light within nano-meter scale thickness. In this thesis, three different mid-infrared devices, thermal emitter, wave trapping sensor and phase modulator were designed based on either metasurface or both metasurface and graphene. Devices were all fabricated with modern semiconductor fabrication processes and their performances were also fully investigated, both experimentally and through simulations. A metasurface was first designed as a frequency selective layer on a graphene thermal emitter to tailor the graybody emission spectrum from a graphene filament into two discrete narrow bands for applications such as gas sensing or molecule detection. The emission and reflectance spectra of the devices were characterised using (FTIR) Fourier transform infrared spectroscopy and showed good agreement with simulations based on the Finite-difference time-domain (FDTD). method. The use of a metasurface to enhance the interaction between molecular vibrations and the evanescent waves, in a total attenuated reflectance system, was also explored. A complementary ring-resonator structure was patterned onto both silicon and SiO2/Si substrates, and the spectral properties of both devices were characterised using an FTIR-ATR system. Experiments were undertaken using 5µL mixtures containing trace amounts of butyl acetate diluted with oleic acid. Without the use of a metasurface, the minimum concentration of butyl acetate that could be clearly detected was 10%, whereas the use of the metasurface on the SiO2/Si substrate allowed the detection of 1% butyl acetate. Finally, graphene was integrated into a metasurface structure to achieve tunability of the design. The third device investigated was a phase modulator which shows the capability to change the amplitude and phase of the reflected wave by electrostatically gating the graphene from -90V to 90V. A dynamic beam steering lens model which is made up of a unit cell consisting of four phase modulator with different phase shift was also proposed to control the angle for the reflected wave from specular to 30°.
Subjects/Keywords: Metasurface; Graphene; Mid-infrared
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APA (6th Edition):
Shi, C. (2019). Metasurface based mid-infrared devices. (Doctoral Dissertation). University of Exeter. Retrieved from http://hdl.handle.net/10871/39300
Chicago Manual of Style (16th Edition):
Shi, C. “Metasurface based mid-infrared devices.” 2019. Doctoral Dissertation, University of Exeter. Accessed January 20, 2021.
http://hdl.handle.net/10871/39300.
MLA Handbook (7th Edition):
Shi, C. “Metasurface based mid-infrared devices.” 2019. Web. 20 Jan 2021.
Vancouver:
Shi C. Metasurface based mid-infrared devices. [Internet] [Doctoral dissertation]. University of Exeter; 2019. [cited 2021 Jan 20].
Available from: http://hdl.handle.net/10871/39300.
Council of Science Editors:
Shi C. Metasurface based mid-infrared devices. [Doctoral Dissertation]. University of Exeter; 2019. Available from: http://hdl.handle.net/10871/39300
University of Sydney
3.
Crawford, Stephanie.
The Development of a High Power, Broadly Tunable 3 µm Fibre Laser for the Measurement of Optical Fibre Loss
.
Degree: 2015, University of Sydney
URL: http://hdl.handle.net/2123/13989
► Mid-Infrared Photonics has attracted growing interest in recent years due to the presence of many strong characteristic vibrational transitions that are highly resonance with the…
(more)
▼ Mid-Infrared Photonics has attracted growing interest in recent years due to the presence of many strong characteristic vibrational transitions that are highly resonance with the low-energy photons of the mid-infrared. As such, a plethora of potential applications stand to benefit from the availability of well-understood and robust sources within this wavelength region including spectroscopy, medicine and defence. The region surrounding 3 µm, corresponding to the antisymmetric stretching vibration of O-H as well as a region of high atmospheric transparency, is of particular interest. However, this spectral region is not yet accessible via readily available devices. As such, the development of well understood, versatile, laser sources at 3 µm remains an area of great scientific interest. In this work, a Ho3+, Pr3+ co-doped fluoride fibre laser is presented that produces an output power of 7.2 W generated at a slope efficiency of 29 %. The excitation source was a power scalable Yb3+-pumped 1.150 µm Raman fibre laser which emitted up to 50 W. The emission linewidth of the system was <0.14 nm and the wavelength of the system was observed to tune between 2.825 µm and 2.975 µm, overlapping with the O-H absorption region of many midinfrared transparent glasses. The system then finds use as a tool for the accurate measurement of the background scattering loss and the degree of water incorporation in the rare earth doped core of a range of commercially available double clad ZBLAN fibres. Furthermore, the spectral location of the O-H absorption feature was observed to be dependent on glass composition shifting from 2.872 µm in undoped ZBLAN to 2.896 µm upon co-doping with Ho3+, Pr3+. Additionally, the chalcogenide glass, As2S3, was observed to have an O-H peak location of 2.911 µm.
Subjects/Keywords: Lasers;
Mid-Infrared;
Fibre;
Tunable
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APA (6th Edition):
Crawford, S. (2015). The Development of a High Power, Broadly Tunable 3 µm Fibre Laser for the Measurement of Optical Fibre Loss
. (Thesis). University of Sydney. Retrieved from http://hdl.handle.net/2123/13989
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Crawford, Stephanie. “The Development of a High Power, Broadly Tunable 3 µm Fibre Laser for the Measurement of Optical Fibre Loss
.” 2015. Thesis, University of Sydney. Accessed January 20, 2021.
http://hdl.handle.net/2123/13989.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Crawford, Stephanie. “The Development of a High Power, Broadly Tunable 3 µm Fibre Laser for the Measurement of Optical Fibre Loss
.” 2015. Web. 20 Jan 2021.
Vancouver:
Crawford S. The Development of a High Power, Broadly Tunable 3 µm Fibre Laser for the Measurement of Optical Fibre Loss
. [Internet] [Thesis]. University of Sydney; 2015. [cited 2021 Jan 20].
Available from: http://hdl.handle.net/2123/13989.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Crawford S. The Development of a High Power, Broadly Tunable 3 µm Fibre Laser for the Measurement of Optical Fibre Loss
. [Thesis]. University of Sydney; 2015. Available from: http://hdl.handle.net/2123/13989
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Cambridge
4.
Alimagham, Farah.
Mid-Infrared Integrated Devices for Optical Chemical Sensing.
Degree: PhD, 2020, University of Cambridge
URL: https://www.repository.cam.ac.uk/handle/1810/307700
► The mid-infrared (MIR) spectral range is of special interest for establishing optical chemical sensor technologies by allowing specific molecular identification and quantification, whether the sample…
(more)
▼ The mid-infrared (MIR) spectral range is of special interest for establishing optical chemical sensor technologies by allowing specific molecular identification and quantification, whether the sample is in a liquid, gas or solid form, in addition to providing highly sensitive, rapid, reagent-free and non-destructive detection. This thesis explores four different liquid- and gas- sensing applications and methods using MIR spectroscopy by integrating it with other technologies, such as microfluidics and fibre-optics. Firstly, fibre-optic integrated microfluidic devices were developed and tested for con- tinuous fluid monitoring. These showed good sensing capabilities for online, continuous and real-time liquid sensing in hard-to-reach locations. Next, this thesis presents the establishment and clinical testing of a novel method for continuous monitoring of the brain chemistry of traumatically brain-injured patients by MIR transmission spectroscopy. Here, the outlet of a cerebral microdialysis catheter is cou- pled to a micro flow-cell and the flowing microdialysate is continuously analysed. Clinical studies were carried out and showed the capability of this system for performing continuous patient monitoring over several hours. With further optimisation, the implementation of this system could lead to improved patient outcome. This thesis also presents a novel method and system based on MIR fibre-optic evanescent- wave spectroscopy, which enables enhanced detection of volatile organic compounds (VOCs). Here, a nanoporous silicon cladding was used to reversibly concentrate molecules close to the fibre surface, thus enhancing VOC detection. A significant increase in sen- sitivity was seen compared to that of an uncoated fibre and successful detection of three different VOCs, both independently and in binary mixtures, was achieved. Finally, this thesis introduces a simple and relatively low-cost fibre-optic sensor for in-line, real-time bioprocess monitoring. The sensor was successfully able to monitor varying concentrations of product (sophorolipids) in fermentation broth and was able to distinguish between the two types of generated product (acidic and lactonic sophorolipids). The work presented in this thesis showed that MIR-integrated sensors have great potential to provide novel and/or enhanced sensing solutions in a wide range of applications, including medical, industrial and environmental.
Subjects/Keywords: mid-infrared; spectroscopy; sensors
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APA (6th Edition):
Alimagham, F. (2020). Mid-Infrared Integrated Devices for Optical Chemical Sensing. (Doctoral Dissertation). University of Cambridge. Retrieved from https://www.repository.cam.ac.uk/handle/1810/307700
Chicago Manual of Style (16th Edition):
Alimagham, Farah. “Mid-Infrared Integrated Devices for Optical Chemical Sensing.” 2020. Doctoral Dissertation, University of Cambridge. Accessed January 20, 2021.
https://www.repository.cam.ac.uk/handle/1810/307700.
MLA Handbook (7th Edition):
Alimagham, Farah. “Mid-Infrared Integrated Devices for Optical Chemical Sensing.” 2020. Web. 20 Jan 2021.
Vancouver:
Alimagham F. Mid-Infrared Integrated Devices for Optical Chemical Sensing. [Internet] [Doctoral dissertation]. University of Cambridge; 2020. [cited 2021 Jan 20].
Available from: https://www.repository.cam.ac.uk/handle/1810/307700.
Council of Science Editors:
Alimagham F. Mid-Infrared Integrated Devices for Optical Chemical Sensing. [Doctoral Dissertation]. University of Cambridge; 2020. Available from: https://www.repository.cam.ac.uk/handle/1810/307700
University of Illinois – Urbana-Champaign
5.
Reddy, Rohith.
Mid infrared spectroscopic imaging and tomography.
Degree: PhD, 0408, 2013, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/44759
► Fourier Transform Infrared (FT-IR) Spectroscopic Imaging is an optical technique that simultaneously provides morphological (two dimensional) and mid-infrared spectral (one dimensional) information for a specimen…
(more)
▼ Fourier Transform
Infrared (FT-IR) Spectroscopic Imaging is an optical technique that simultaneously provides morphological (two dimensional) and
mid-
infrared spectral (one dimensional) information for a specimen under observation. In this dissertation, we develop a new instrument that extends the capabilities of FT-IR imaging to provide three dimensional morphological information along with
mid-
infrared spectral information on the microscopic length scale. We first demonstrate that spectroscopic information from the
mid-
infrared can be used to perform histologic recognition and cancer detection in prostate, breast and skin cancer tissues. These studies utilize FT-IR imaging data of thin tissue slices from several hundred patients. The segmentation algorithms and instrumentation used are described in detail. We perform a rigorous analysis of instrumentation and data so as to understand the limits and limitations of current state-of-the-art instrumentation. We then propose a new instrument that adds a new dimension of information to current instruments and establish the new state-of-the-art in
mid-
infrared imaging. The theoretical basis of such instrumentation is presented in detail and techniques for visualization of four dimensional data are outlined.
Advisors/Committee Members: Bhargava, Rohit (advisor), Bhargava, Rohit (Committee Chair), Carney, Paul S. (committee member), Do, Minh N. (committee member), Ahuja, Narendra (committee member).
Subjects/Keywords: Fourier Transform Infrared (FT-IR) spectroscopic Imaging; Mid-Infrared Spectroscopic Tomography; Spectroscopic Imaging; Spectroscopic Tomography; mid-Infrared (Mid-IR); Spectroscopy; Imaging
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APA (6th Edition):
Reddy, R. (2013). Mid infrared spectroscopic imaging and tomography. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/44759
Chicago Manual of Style (16th Edition):
Reddy, Rohith. “Mid infrared spectroscopic imaging and tomography.” 2013. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed January 20, 2021.
http://hdl.handle.net/2142/44759.
MLA Handbook (7th Edition):
Reddy, Rohith. “Mid infrared spectroscopic imaging and tomography.” 2013. Web. 20 Jan 2021.
Vancouver:
Reddy R. Mid infrared spectroscopic imaging and tomography. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2013. [cited 2021 Jan 20].
Available from: http://hdl.handle.net/2142/44759.
Council of Science Editors:
Reddy R. Mid infrared spectroscopic imaging and tomography. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2013. Available from: http://hdl.handle.net/2142/44759
Cornell University
6.
Lau, Ryan.
Nonlinear Optical Phenomena In Silicon Nanowaveguides For The Mid-Infrared Wavelength Region.
Degree: PhD, Electrical Engineering, 2015, Cornell University
URL: http://hdl.handle.net/1813/40590
► Silicon photonics has shown great promise as an integrated solution for efficient nonlinear optical interactions in compact, chip-scale devices. While there has been much work…
(more)
▼ Silicon photonics has shown great promise as an integrated solution for efficient nonlinear optical interactions in compact, chip-scale devices. While there has been much work over the past decade on developing a variety of all-optical devices for telecom applications, an emerging area of research focuses on extending the operational wavelength of such devices to the
mid-
infrared (MIR) regime. By leveraging enhanced nonlinear optical effects and exploiting reduced losses at longer wavelengths, silicon photonic technology may be extended into a new realm of applications at MIR wavelengths. In this thesis we investigate nonlinear optical phenomena in silicon nanowaveguides for the MIR wavelength region. We present a numerical analysis of broadband four-wave mixing (FWM) and supercontinuum generation (SCG) in silicon nanowaveguides in the 2-[mu]m region. We demonstrate for the first time continuouswave FWM-based wavelength conversion between the telecom and MIR wavelength ranges. We also demonstrate the first silicon-based, octave-spanning supercontinuum (SCG) as well as the longest wavelength generated via SCG on a silicon chip. Next we numerically investigate silicon microresonator-based optical frequency combs using a modified Lugiato-Lefever model and discuss the implications of nonlinear loss effects, identifying regimes in the MIR in which broadband parametric oscillation may be achieved. While much of this work focuses on the silicon-on-insulator (SOI) platform and silicon dioxide or air claddings, we also introduce a novel waveguiding platform for wavelengths beyond 3 [mu]m. We design and fabricate devices using standard SOI wafers with a top cladding of silicon nitride and demonstrate broadband FWM near 2 [mu]m.
Advisors/Committee Members: Rana, Farhan (chair), Lipson, Michal (committee member), Gaeta, Alexander L. (committee member).
Subjects/Keywords: Nonlinear Optics; Silicon Photonics; Mid-Infrared
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APA (6th Edition):
Lau, R. (2015). Nonlinear Optical Phenomena In Silicon Nanowaveguides For The Mid-Infrared Wavelength Region. (Doctoral Dissertation). Cornell University. Retrieved from http://hdl.handle.net/1813/40590
Chicago Manual of Style (16th Edition):
Lau, Ryan. “Nonlinear Optical Phenomena In Silicon Nanowaveguides For The Mid-Infrared Wavelength Region.” 2015. Doctoral Dissertation, Cornell University. Accessed January 20, 2021.
http://hdl.handle.net/1813/40590.
MLA Handbook (7th Edition):
Lau, Ryan. “Nonlinear Optical Phenomena In Silicon Nanowaveguides For The Mid-Infrared Wavelength Region.” 2015. Web. 20 Jan 2021.
Vancouver:
Lau R. Nonlinear Optical Phenomena In Silicon Nanowaveguides For The Mid-Infrared Wavelength Region. [Internet] [Doctoral dissertation]. Cornell University; 2015. [cited 2021 Jan 20].
Available from: http://hdl.handle.net/1813/40590.
Council of Science Editors:
Lau R. Nonlinear Optical Phenomena In Silicon Nanowaveguides For The Mid-Infrared Wavelength Region. [Doctoral Dissertation]. Cornell University; 2015. Available from: http://hdl.handle.net/1813/40590
University of Oxford
7.
Sterzl, Sabrina.
Optoelectronic properties of semiconductor nanowires in the infrared regime.
Degree: PhD, 2020, University of Oxford
URL: http://ora.ox.ac.uk/objects/uuid:6eda13c4-5026-4ffb-a9a4-cbf5b626d57c
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.808297
► Semiconducting nanowires are promising elements for potential use in nanoscale devices. Due to their versatility, they can be utilised for a wide range of applications.…
(more)
▼ Semiconducting nanowires are promising elements for potential use in nanoscale devices. Due to their versatility, they can be utilised for a wide range of applications. To correlate the nanowires with their best possible device applications, a powerful all-optical platform was developed to characterise both their electrical and optical properties by combining terahertz spectroscopy and photoluminescence spectroscopy. The focus will be on three different material systems (gallium phosphide, silicongermanium, indium arsenide) and their potential use for optoelectronic devices in the infrared region of the electromagnetic spectrum. Theory has predicted a direct bandgap for silicon-germanium alloys grown in a hexagonal crystal phase, but it has not been experimentally proven so far. This thesis demonstrates the realization of hexagonal silicon and silicon-germanium via template-assisted nanowire growth. The characterisation of these hexagonal nanowires is depicted via a series of terahertz and photoluminescence spectroscopy measurements to study their electrical and optical properties and therefore confirm information about their bandgap. Firstly, hexagonal gallium phosphide nanowires, including the effect of the different growth recipes and defects, are studied as they form the template (nanowire core) for later shell growth of hexagonal silicon and silicon-germanium. The structural flaws in gallium phosphide nanowires under different growth conditions are qualitatively examined; these defects can be further transferred to the shell growth, and thus determine the shell quality. In the following, the core-shell nanowires, including hexagonal silicon shell and hexagonal silicongermanium shell (with varying germanium contents), are investigated. Defect density is found to correlate strongly with the photoconductivity lifetime. For the first time, the surface recombination velocity of hexagonal silicon is determined. Meanwhile indications of a direct bandgap of hexagonal silicon are observed and elaborated on. Theoretical calculations are used to support the rare case of a direct bandgap in silicon. It is anticipated that such silicon nanowires could be designed as high-emission-efficiency nanolasers, which could revolutionize the field of silicon-based technology. With the same characterisation tools, a second semiconducting nanowire system — indium arsenide and its compound indium arsenide antimonide — is investigated. Such a type of material has naturally a direct bandgap, which can be tuned from 0.1 eV to 0.4 eV (by changing its composition). Therefore, the study of these indium-arsenide based nanowires aids in the design of higher-performance devices. To give a thorough overview, nanowires grown via metal organic vapour phase epitaxy and molecular beam epitaxy are compared. They are also passivated with Al2O3 because these nanowires are surface sensitive. The influence of diameter, crystal structure and passivation layer on their electrical and optical properties are systemically studied. Furthermore, the bandgap…
Subjects/Keywords: Semiconductor; mid-infrared Fourier Transform Photoluminescence; Nanowires
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APA ·
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APA (6th Edition):
Sterzl, S. (2020). Optoelectronic properties of semiconductor nanowires in the infrared regime. (Doctoral Dissertation). University of Oxford. Retrieved from http://ora.ox.ac.uk/objects/uuid:6eda13c4-5026-4ffb-a9a4-cbf5b626d57c ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.808297
Chicago Manual of Style (16th Edition):
Sterzl, Sabrina. “Optoelectronic properties of semiconductor nanowires in the infrared regime.” 2020. Doctoral Dissertation, University of Oxford. Accessed January 20, 2021.
http://ora.ox.ac.uk/objects/uuid:6eda13c4-5026-4ffb-a9a4-cbf5b626d57c ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.808297.
MLA Handbook (7th Edition):
Sterzl, Sabrina. “Optoelectronic properties of semiconductor nanowires in the infrared regime.” 2020. Web. 20 Jan 2021.
Vancouver:
Sterzl S. Optoelectronic properties of semiconductor nanowires in the infrared regime. [Internet] [Doctoral dissertation]. University of Oxford; 2020. [cited 2021 Jan 20].
Available from: http://ora.ox.ac.uk/objects/uuid:6eda13c4-5026-4ffb-a9a4-cbf5b626d57c ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.808297.
Council of Science Editors:
Sterzl S. Optoelectronic properties of semiconductor nanowires in the infrared regime. [Doctoral Dissertation]. University of Oxford; 2020. Available from: http://ora.ox.ac.uk/objects/uuid:6eda13c4-5026-4ffb-a9a4-cbf5b626d57c ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.808297
Harvard University
8.
Shankar, Raji.
Mid-Infrared Photonics in Silicon.
Degree: PhD, Engineering Sciences, 2013, Harvard University
URL: http://nrs.harvard.edu/urn-3:HUL.InstRepos:11051174
► The mid-infrared wavelength region (2-20 µm) is of great utility for a number of applications, including chemical bond spectroscopy, trace gas sensing, and medical diagnostics.…
(more)
▼ The mid-infrared wavelength region (2-20 µm) is of great utility for a number of applications, including chemical bond spectroscopy, trace gas sensing, and medical diagnostics. Despite this wealth of applications, the on-chip mid-IR photonics platform needed to access them is relatively undeveloped. Silicon is an attractive material of choice for the mid-IR, as it exhibits low loss through much of the mid-IR. Using silicon allows us to take advantage of well-developed fabrication techniques and CMOS compatibility, making the realization of on-chip integrated mid-IR devices more realistic. The mid-IR wavelengths also afford the opportunity to exploit Si's high third-order optical nonlinearity for nonlinear frequency generation applications. In this work, we present a Si-based platform for mid-IR photonics, with a special focus on micro-resonators for strong on-chip light confinement in the 4-5 μm range. Additionally, we develop experimental optical characterization techniques to overcome the inherent difficulties of working in this wavelength regime. First, we demonstrate the design, fabrication, and characterization of photonic crystal cavities in a silicon membrane platform, operational at 4.4 μm (Chapter 2). By transferring the technique known as resonant scattering to the mid-IR, we measure quality (Q) factors of up to 13,600 in these photonic crystal cavities. We also develop a technique known as scanning resonant scattering microscopy to image our cavity modes and optimize alignment to our devices. Next, we demonstrate the electro-optic tuning of these mid-IR Si photonic crystal cavities using gated graphene (Chapter 3). We demonstrate a tuning of about 4 nm, and demonstrate the principle of on-chip mid-IR modulation using these devices. We then investigate the phenomenon of optical bistability seen in our photonic crystal cavities (Chapter 4). We discover that our bistability is thermal in origin and use post-processing techniques to mitigate bistability and increase Q-factors. We then demonstrate the design, fabrication, and characterization grating-coupled ring resonators in a silicon-on-sapphire (SOS) platform at 4.4 μm, achieving intrinsic Q-factors as high as 278,000 in these devices (Chapter 5). Finally, we provide a quantitative analysis of the potential of our SOS devices for nonlinear frequency generation and describe ongoing experiments in this regard (Chapter 6).
Engineering and Applied Sciences
Advisors/Committee Members: Loncar, Marko (advisor), Walsworth, Ron (committee member), Mazur, Eric (committee member), Hu, Evelyn (committee member).
Subjects/Keywords: Optics; Mid-infrared; photonic crystals; photonics
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APA (6th Edition):
Shankar, R. (2013). Mid-Infrared Photonics in Silicon. (Doctoral Dissertation). Harvard University. Retrieved from http://nrs.harvard.edu/urn-3:HUL.InstRepos:11051174
Chicago Manual of Style (16th Edition):
Shankar, Raji. “Mid-Infrared Photonics in Silicon.” 2013. Doctoral Dissertation, Harvard University. Accessed January 20, 2021.
http://nrs.harvard.edu/urn-3:HUL.InstRepos:11051174.
MLA Handbook (7th Edition):
Shankar, Raji. “Mid-Infrared Photonics in Silicon.” 2013. Web. 20 Jan 2021.
Vancouver:
Shankar R. Mid-Infrared Photonics in Silicon. [Internet] [Doctoral dissertation]. Harvard University; 2013. [cited 2021 Jan 20].
Available from: http://nrs.harvard.edu/urn-3:HUL.InstRepos:11051174.
Council of Science Editors:
Shankar R. Mid-Infrared Photonics in Silicon. [Doctoral Dissertation]. Harvard University; 2013. Available from: http://nrs.harvard.edu/urn-3:HUL.InstRepos:11051174
Université de Neuchâtel
9.
Maulini, Richard.
Broadly tunable mid-infrared quantum cascade lasers for
spectroscopic applications.
Degree: 2006, Université de Neuchâtel
URL: http://doc.rero.ch/record/6269
► Quantum cascade lasers are unipolar semiconductor lasers based on intersubband transitions in heterostructures. These lasers, which have demonstrated continuous wave operation at room temperature in…
(more)
▼ Quantum cascade lasers are unipolar semiconductor
lasers based on intersubband transitions in heterostructures. These
lasers, which have demonstrated continuous wave operation at room
temperature in the
mid-
infrared spectral range, are well suited for
the realization of compact, ultra-sensitive, trace-gas sensors
based on absorption spectroscopy. Up to now, only distributed
feedback (DFB) single-mode devices have been used for such
applications. DFB quantum cascade lasers have proven to be
effective for gas sensing, but their relatively narrow tuning
range, smaller or equal to about 1% of the wavelength, makes them
not very versatile and limits their usefulness for spectroscopic
investigations. In this thesis we developed broadly tunable
external cavity quantum cascade lasers. The main advantage of these
sources compared with DFBs is their broader tuning range, which is
limited only by the spectral bandwidth of the gain element. We
particularly studied broad gain bandwidth active regions based on
bound-to-continuum designs. With that kind of active region, we
have demonstrated a tuning range equal to 15% of the center
wavelength at ~ 10 m, which was three times broader than the
best values reported in the literature at that time, as well as
good performance in pulsed mode at room temperature. Using a
strain-compensated bound-to-continuum design emitting near 5.2 m,
we have demonstrated for the first time continuous-wave operation
of an external cavity quantum cascade laser on a thermoelectric
cooler. The tuning range was comparable to that of pulsed devices,
but with a much better side-mode suppression ratio and a much
narrower linewidth. This continuous-wave device has successfully
been applied to the spectroscopy of nitric oxide in collaboration
with Prof. Tittel's Laser Science Group at Rice University. High
resolution absorption spectra of that gas could be acquired over a
large wavelength range. We also studied heterogeneous cascade
structures, that is quantum cascade structures in which the various
stages emit at several different wavelengths, as a way to increase
further the tuning range of external cavity quantum cascade lasers.
A pulsed laser tunable from 8.2 to 10.4 m, that is over 24% of the
center wavelength has been realized using an active region composed
of two substacks of bound-to-continuum designs. We conclude on the
feasibility of room temperature, continuous-wave, broadly-tunable
external cavity quantum cascade lasers in the
mid-
infrared spectral
range. These devices will be useful for the analysis of
multi-component gases, for high resolution spectroscopic
investigations in fundamental science, and for the detection of
heavy molecules with broad absorption features which DFB quantum
cascade lasers cannot scan entirely.
Advisors/Committee Members: Jérôme (Dir.).
Subjects/Keywords: mid-infrared spectroscopy
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APA (6th Edition):
Maulini, R. (2006). Broadly tunable mid-infrared quantum cascade lasers for
spectroscopic applications. (Thesis). Université de Neuchâtel. Retrieved from http://doc.rero.ch/record/6269
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Maulini, Richard. “Broadly tunable mid-infrared quantum cascade lasers for
spectroscopic applications.” 2006. Thesis, Université de Neuchâtel. Accessed January 20, 2021.
http://doc.rero.ch/record/6269.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Maulini, Richard. “Broadly tunable mid-infrared quantum cascade lasers for
spectroscopic applications.” 2006. Web. 20 Jan 2021.
Vancouver:
Maulini R. Broadly tunable mid-infrared quantum cascade lasers for
spectroscopic applications. [Internet] [Thesis]. Université de Neuchâtel; 2006. [cited 2021 Jan 20].
Available from: http://doc.rero.ch/record/6269.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Maulini R. Broadly tunable mid-infrared quantum cascade lasers for
spectroscopic applications. [Thesis]. Université de Neuchâtel; 2006. Available from: http://doc.rero.ch/record/6269
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
10.
Liakat, Sabbir.
Development of a Noninvasive in vivo Glucose Sensor Based on Mid-Infrared Quantum Cascade Laser Spectroscopy
.
Degree: PhD, 2015, Princeton University
URL: http://arks.princeton.edu/ark:/88435/dsp01th83m165x
► Diabetes mellitus impacts over 340 million people across the world. Diabetics must monitor their glucose levels multiple times a day and currently, the most accurate…
(more)
▼ Diabetes mellitus impacts over 340 million people across the world. Diabetics must monitor their glucose levels multiple times a day and currently, the most accurate method of doing so involves pricking one's finger, an often-painful procedure. This dissertation documents research aimed at developing a noninvasive in vivo glucose sensor, with the motivation of implementing a pain-free means of measuring glucose for diabetics. We utilize a novel approach based on
mid-
infrared (
mid-IR) Quantum Cascade (QC) laser spectroscopy. While previous optical solutions using near-IR light between 1300-1900 nm have failed due to limits on glucose absorption feature specificity, the
mid-IR region between 8 - 10 μm contains strong absorption features with cross-sections up to four orders of magnitude greater than their near-IR counterparts. Although
mid-IR spectroscopy has traditionally been neglected for in vivo applications due to the lack of light sources capable of sufficient skin penetration, the advent of powerful QC lasers allows us to overcome this limitation. Here, theoretical background of light-matter interaction is presented, followed by discussion of experimental research progressing towards noninvasive glucose sensing. First, the feasibility of
mid-IR noninvasive glucose sensing is shown through measurements of angular scattering patterns in skin, which show that QC laser light can penetrate deep enough into skin. Next, we show clinically accurate sensing of physiological glucose concentrations in vitro using partial least squares regression (PLSR) analysis on
mid-IR transmission spectra of proxy solutions for dermal interstitial fluid. Finally, we record breakthrough results showing clinically accurate glucose prediction capability in vivo with human subjects using a setup featuring hollow-core fiber optics, liquid nitrogen cooled detection, and PLSR analysis. This sensor is then made more compact by replacing the fibers with an integrating sphere that significantly increases the collection efficiency of scattered light from skin. This allows the sensor to be housed on a mobile cart, and it removes the system's nitrogen dependency by allowing the use of a thermoelectrically cooled detector, all while maintaining glucose sensing accuracy. We conclude with an outlook for the improved portable sensor to move on from laboratory trials with volunteers to large-scale trials in diabetes clinics.
Advisors/Committee Members: Gmachl, Claire F (advisor).
Subjects/Keywords: glucose sensing;
mid-infrared;
QC Laser spectroscopy
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APA ·
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MLA ·
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CSE |
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to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Liakat, S. (2015). Development of a Noninvasive in vivo Glucose Sensor Based on Mid-Infrared Quantum Cascade Laser Spectroscopy
. (Doctoral Dissertation). Princeton University. Retrieved from http://arks.princeton.edu/ark:/88435/dsp01th83m165x
Chicago Manual of Style (16th Edition):
Liakat, Sabbir. “Development of a Noninvasive in vivo Glucose Sensor Based on Mid-Infrared Quantum Cascade Laser Spectroscopy
.” 2015. Doctoral Dissertation, Princeton University. Accessed January 20, 2021.
http://arks.princeton.edu/ark:/88435/dsp01th83m165x.
MLA Handbook (7th Edition):
Liakat, Sabbir. “Development of a Noninvasive in vivo Glucose Sensor Based on Mid-Infrared Quantum Cascade Laser Spectroscopy
.” 2015. Web. 20 Jan 2021.
Vancouver:
Liakat S. Development of a Noninvasive in vivo Glucose Sensor Based on Mid-Infrared Quantum Cascade Laser Spectroscopy
. [Internet] [Doctoral dissertation]. Princeton University; 2015. [cited 2021 Jan 20].
Available from: http://arks.princeton.edu/ark:/88435/dsp01th83m165x.
Council of Science Editors:
Liakat S. Development of a Noninvasive in vivo Glucose Sensor Based on Mid-Infrared Quantum Cascade Laser Spectroscopy
. [Doctoral Dissertation]. Princeton University; 2015. Available from: http://arks.princeton.edu/ark:/88435/dsp01th83m165x
University of Arizona
11.
Rockmore, Robert.
VECSEL Frequency Combs for Mid-Infrared Spectroscopy
.
Degree: 2020, University of Arizona
URL: http://hdl.handle.net/10150/645801
► Frequency combs with high repetition rates above 1 GHz offer a number of advantages over more common Mhz combs, such as higher power per comb…
(more)
▼ Frequency combs with high repetition rates above 1 GHz offer a number of advantages over more common Mhz combs, such as higher power per comb line, more easily resolvable comb teeth, and higher time resolution for sensing applications. Vertical external cavity surface emitting lasers (VECSELs) are a type of semiconductor laser that can be readily modelocked with GHz repetition rates. In this dissertation, I will present the development of these VECSELs into fully stabilized frequency combs operating in the
mid-
infrared spectral region around 3 µm. This region is of special interest because of the strong absorption exhibited by many gas molecules at these wavelengths, making such sources attractive for remote sensing and gas spectroscopy applications. I will first present the development of these VECSEL sources into reliable GHz oscillators and some of the benefits and limitations of these devices. Next, I will go into detail of the development of a fully stabilized
mid-
infrared frequency comb using a VECSEL oscillator and describe its performance characteristics. This comb produces over 300 mW of output power from 3.0-3.5 µm and has zero offset frequency allowing for full stabilization with a simple repetition rate lock. The stability of this comb was leveraged for comb resolved spectroscopy using a virtually imaged phased array (VIPA) spectrometer that was used with a native GHz frequency comb for the first time. The capability of this system for high resolution time resolved gas spectroscopy measurements was demonstrated. The spectrometer can resolve the individual comb teeth, which leads to resolution and accuracy that is limited by the comb linewidth instead of the spectrometer resolution.
Advisors/Committee Members: Moloney, Jerome V (advisor), Norwood, Robert A. (committeemember), Jones, Ronald J. (committeemember).
Subjects/Keywords: Frequency Comb;
Mid Infrared;
Spectrometer;
VECSEL;
VIPA
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Rockmore, R. (2020). VECSEL Frequency Combs for Mid-Infrared Spectroscopy
. (Doctoral Dissertation). University of Arizona. Retrieved from http://hdl.handle.net/10150/645801
Chicago Manual of Style (16th Edition):
Rockmore, Robert. “VECSEL Frequency Combs for Mid-Infrared Spectroscopy
.” 2020. Doctoral Dissertation, University of Arizona. Accessed January 20, 2021.
http://hdl.handle.net/10150/645801.
MLA Handbook (7th Edition):
Rockmore, Robert. “VECSEL Frequency Combs for Mid-Infrared Spectroscopy
.” 2020. Web. 20 Jan 2021.
Vancouver:
Rockmore R. VECSEL Frequency Combs for Mid-Infrared Spectroscopy
. [Internet] [Doctoral dissertation]. University of Arizona; 2020. [cited 2021 Jan 20].
Available from: http://hdl.handle.net/10150/645801.
Council of Science Editors:
Rockmore R. VECSEL Frequency Combs for Mid-Infrared Spectroscopy
. [Doctoral Dissertation]. University of Arizona; 2020. Available from: http://hdl.handle.net/10150/645801
12.
Koranda Petr.
Generation of the New Laser Radiation Wavelengths in Solid-State Lasers
.
Degree: 2011, Czech University of Technology
URL: http://hdl.handle.net/10467/8043
Mid-infrared laser radiation generation in Cr:ZnSe laser at room-temperature; Mid-infrared laser radiation generation in Cr:ZnSe laser at room-temperature
Advisors/Committee Members: Jelínková Helena (advisor).Subjects/Keywords: Cr:ZnSE; laser; mid-infrared; Bridgeman; Tm:YLF
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APA (6th Edition):
Petr, K. (2011). Generation of the New Laser Radiation Wavelengths in Solid-State Lasers
. (Thesis). Czech University of Technology. Retrieved from http://hdl.handle.net/10467/8043
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Petr, Koranda. “Generation of the New Laser Radiation Wavelengths in Solid-State Lasers
.” 2011. Thesis, Czech University of Technology. Accessed January 20, 2021.
http://hdl.handle.net/10467/8043.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Petr, Koranda. “Generation of the New Laser Radiation Wavelengths in Solid-State Lasers
.” 2011. Web. 20 Jan 2021.
Vancouver:
Petr K. Generation of the New Laser Radiation Wavelengths in Solid-State Lasers
. [Internet] [Thesis]. Czech University of Technology; 2011. [cited 2021 Jan 20].
Available from: http://hdl.handle.net/10467/8043.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Petr K. Generation of the New Laser Radiation Wavelengths in Solid-State Lasers
. [Thesis]. Czech University of Technology; 2011. Available from: http://hdl.handle.net/10467/8043
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Waterloo
13.
Wang, Xueren.
InAs/AlSb Based Mid-Infrared QCL Growth and XRD Simulation.
Degree: 2016, University of Waterloo
URL: http://hdl.handle.net/10012/10677
► In the past two decades, mid-infrared (MIR) quantum cascade laser (QCL) research has been rapidly developed and has resulted in an enabling platform for the…
(more)
▼ In the past two decades, mid-infrared (MIR) quantum cascade laser (QCL) research has been rapidly developed and has resulted in an enabling platform for the remote sensing and metrology. QCL is designed by spatial confinement in quantum well structures on a nanometer scale, enabling the transitions between the electron confined states. In order to obtain the particular characteristics via quantum engineering, the material growth needs to be precisely controlled across the large number of layers. In this work, the growth condition of InAs/AlSb based MIR-QCL, grown by molecular beam epitaxy (MBE), is investigated. A low defect density growth result is observed by employing the optimized growth condition. Laser devices with disk mesa or ridge waveguide are fabricated, and the further electrical characterization exhibits the device lasing at 3.4 μm with a threshold current density of around 2.1 kA/cm2. The superlattice average layer thickness is determined by using high resolution X-ray diffraction (HRXRD), which is considered as one of the non-destructive analysis technique to extract the information about the thin film constructions. Comprehensive modeling built and simulation results are analyzed and discussed based on the HRXRD ω-2θ scanning curve, yielding valuable information about the full structure device growth result. The interface related simulations are performed by using RADS software to investigate the relationship between the strain distribution and the relative intensities of the SL reflections in XRD.
Subjects/Keywords: InAs/AlSb; Mid-infrared QCL; XRD
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APA (6th Edition):
Wang, X. (2016). InAs/AlSb Based Mid-Infrared QCL Growth and XRD Simulation. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/10677
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Wang, Xueren. “InAs/AlSb Based Mid-Infrared QCL Growth and XRD Simulation.” 2016. Thesis, University of Waterloo. Accessed January 20, 2021.
http://hdl.handle.net/10012/10677.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Wang, Xueren. “InAs/AlSb Based Mid-Infrared QCL Growth and XRD Simulation.” 2016. Web. 20 Jan 2021.
Vancouver:
Wang X. InAs/AlSb Based Mid-Infrared QCL Growth and XRD Simulation. [Internet] [Thesis]. University of Waterloo; 2016. [cited 2021 Jan 20].
Available from: http://hdl.handle.net/10012/10677.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Wang X. InAs/AlSb Based Mid-Infrared QCL Growth and XRD Simulation. [Thesis]. University of Waterloo; 2016. Available from: http://hdl.handle.net/10012/10677
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Oklahoma
14.
Jiang, Yuchao.
High-performance InAs-based interband cascade lasers.
Degree: PhD, 2016, University of Oklahoma
URL: http://hdl.handle.net/11244/34604
► Currently, there are only two types of mid-infrared lasers that are capable of continuous-wave (CW) operation above room temperature: quantum cascade (QC) lasers and interband…
(more)
▼ Currently, there are only two types of
mid-
infrared lasers that are capable of continuous-wave (CW) operation above room temperature: quantum cascade (QC) lasers and interband cascade (IC) lasers. Both of them share the cascade feature for carrier recycling. The most successful QC lasers, based on the inter-subband transition and the well-established InGaAs/InAlAs/InP material system, are able to deliver several watts of optical power. In contrast, IC lasers, based on the interband transition and the unique InAs/GaSb/AlSb type-II broken-bandgap material system, have the threshold power density more than an order of magnitude lower than that of QC lasers (e.g., 0.3 kW/cm2 vs. 11 kW/cm2). As a result, IC lasers become a better solution for low-power applications in the
mid-
infrared region.
GaSb-based IC lasers have achieved the best performance around 3.7 μm with a threshold current density as low as 100 A/cm2 at 300 K. However, their waveguide cladding layers, consisting of thick InAs/AlSb superlattice, have a low thermal conductivity and are challenging to grow by molecular beam epitaxy. These problems become more severe at longer lasing wavelengths due to the requirement of thicker cladding layers. InAs-based IC lasers, utilizing highly doped InAs as the optical cladding layer, have been developed to address these issues. The goal of this dissertation is to use modeling and experiments to explore several aspects of InAs-based IC lasers, including far-field patterns, high-temperature operation, long-wavelength operation, wide-tunability, and single frequency mode operation.
The beam quality is critical for the laser application. The higher-order spatial modes naturally appear when the laser ridge is wider than the lasing wavelength in the medium. For InAs-based IC lasers with a thin top cladding layer, the top contact configuration can have a major influence on the spatial modes, which are observed in the measurement of far-field patterns. The physical origin is identified by waveguide modeling based on an effective index method.
Radical design innovations, including “shortened injector” and “carrier rebalancing,” have significantly improved the performance of both GaSb-based and InAs-based IC lasers. Furthermore, a hybrid waveguide, consisting of an inner cladding layer with InAs/AlSb superlattice and an outer cladding layer with highly doped InAs, has significantly increased the modal gain of InAs-based IC lasers. As a result, CW operations above room temperature have been achieved at wavelengths of 4.6~4.8 μm. The threshold current density, 247 A/cm2 at 300 K in pulsed mode, is the lowest ever reported among the
mid-
infrared semiconductor lasers at similar wavelengths. The pulsed operating temperature is as high as 377 K.
Long-wavelength operations are vigorously explored. With the hybrid waveguide mentioned above, the lasing temperature reaches 324 K at a wavelength of 6.4 μm. Further design improvement and optimization are presented. In addition, the lasing wavelength is extended to 11.2 μm at 130 K.…
Advisors/Committee Members: Yang, Rui (advisor), Santos, Michael (committee member), Shi, Zhisheng (committee member), Johnson, Matthew (committee member), Sluss, James (committee member).
Subjects/Keywords: semiconductor lasers; interband cascade; mid-infrared
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APA ·
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MLA ·
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Export
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Manager
APA (6th Edition):
Jiang, Y. (2016). High-performance InAs-based interband cascade lasers. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/34604
Chicago Manual of Style (16th Edition):
Jiang, Yuchao. “High-performance InAs-based interband cascade lasers.” 2016. Doctoral Dissertation, University of Oklahoma. Accessed January 20, 2021.
http://hdl.handle.net/11244/34604.
MLA Handbook (7th Edition):
Jiang, Yuchao. “High-performance InAs-based interband cascade lasers.” 2016. Web. 20 Jan 2021.
Vancouver:
Jiang Y. High-performance InAs-based interband cascade lasers. [Internet] [Doctoral dissertation]. University of Oklahoma; 2016. [cited 2021 Jan 20].
Available from: http://hdl.handle.net/11244/34604.
Council of Science Editors:
Jiang Y. High-performance InAs-based interband cascade lasers. [Doctoral Dissertation]. University of Oklahoma; 2016. Available from: http://hdl.handle.net/11244/34604
15.
Novaes, André Luís da Silva.
Tecnologia Analítica em processo (PAT): método espectroscópico como alternativa ao método clássico para uniformidade de conteúdo e doseamento de lamivudina e zidovudina em comprimidos revestidos.
Degree: Mestrado, Produção e Controle Farmacêuticos, 2013, University of São Paulo
URL: http://www.teses.usp.br/teses/disponiveis/9/9139/tde-26032014-160051/
;
► A zidovudina, conhecida como AZT, é um inibidor da transcriptase reversa, enquanto que a lamivudina é um fármaco antirretroviral que atua na inibição da síntese…
(more)
▼ A zidovudina, conhecida como AZT, é um inibidor da transcriptase reversa, enquanto que a lamivudina é um fármaco antirretroviral que atua na inibição da síntese de ácidos nucléicos. Estes são dois dos 21 fármacos componentes dos medicamentos distribuídas pelo Ministério da Saúde Brasileiro em programas de combate a Síndrome da imunodeficiência Adquirida (Acquired Immunodeficiency Syndrome - AIDS), configurando-se assim uma grande demanda de produção de medicamentos com estes fármacos. Programas de Tecnologia Analítica em Processo (Process Analytical techology - PAT), embasadas por avanços nos guias internacionais da Conferência Internacional sobre a Harmonização dos Requerimentos Técnicos para o Registro de Produtos Farmacêuticos para o uso Humano (International Conference on Harmonisation of Technical Requirements for Registration of Pharmaceuticals for Human Use - ICH) e pela agência norte-americana para a Administração de Alimentos e Medicamentos (Food and Drugs Administration - FDA), estão ganhando força como alternativas para aumentar a eficiência e a segurança na produção de medicamentos, tanto para aqueles já em processo produtivo como também para medicamentos em fase de desenvolvimento. Estes últimos são denominados desenvolvimento em programas de Qualidade por Design (QbD). Métodos de quantificação por espectroscopia (NIR, MID, RAMAM, entre outras) são reconhecidos como ferramentas para a PAT. Neste contexto propôs-se comparar objetivamente o método tradicional de quantificação destes dois fármacos frente a um método de quantificação desenvolvido utilizando-se a espectroscopia no infravermelho médio (MID). Prepararam-se assim 41 amostras de calibração e 23 amostras de validação, compostas por misturas de zidovudina, lamivudina e placebo (qs) em escala laboratorial, na faixa de 80 a 120% da concentração nominal de uma associação comercial dos dois fármacos. As concentrações de referência de todas as preparações foram determinadas empregando-se o método de referência por Cromatografia Líquida de Alta Eficiência (CLAE) da Farmacopeia Americana (United States Pharmacopeia - USP). Subsequentemente, obtiveram-se cinco espectros no infravermelho de cada uma das preparações, na faixa de 450 a 4000 cm-1. Os espectros foram então pré-processados e utilizados para a construção de um modelo de calibração multivariado por PLS (mínimo quadrados parciais), de acordo com a ASTM E1655-05. Adicionalmente, o método de CLAE foi transferido para um método de UPLC de acordo com o Capitulo Geral descrito no volume 37(3) do Fórum da USP (United States Pharmacopeia). O desempenho do método MID foi então comparado com o método tradicional, bem como com o novo método de quantificação por UPLC. Foram definidaLs assim regiões de confiança para embasar a utilização dos métodos desenvolvidos. O método de quantificação por MID apresentou uma grande variabilidade enquanto que o método por UPLC foi totalmente comparável com o método tradicional, reduzindo o tempo de corrida de 60 minutos para 12.55 minutos.
Zidovudine, also known as AZT…
Advisors/Committee Members: Pinto, Terezinha de Jesus Andreoli.
Subjects/Keywords: Espectroscopia infravermelha; Infrared spectroscopy; Lamivudina; Lamivudine; MID; MID; PAT; PAT; UPLC; UPLC; Zidovudina; Zidovudine
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APA ·
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Manager
APA (6th Edition):
Novaes, A. L. d. S. (2013). Tecnologia Analítica em processo (PAT): método espectroscópico como alternativa ao método clássico para uniformidade de conteúdo e doseamento de lamivudina e zidovudina em comprimidos revestidos. (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/9/9139/tde-26032014-160051/ ;
Chicago Manual of Style (16th Edition):
Novaes, André Luís da Silva. “Tecnologia Analítica em processo (PAT): método espectroscópico como alternativa ao método clássico para uniformidade de conteúdo e doseamento de lamivudina e zidovudina em comprimidos revestidos.” 2013. Masters Thesis, University of São Paulo. Accessed January 20, 2021.
http://www.teses.usp.br/teses/disponiveis/9/9139/tde-26032014-160051/ ;.
MLA Handbook (7th Edition):
Novaes, André Luís da Silva. “Tecnologia Analítica em processo (PAT): método espectroscópico como alternativa ao método clássico para uniformidade de conteúdo e doseamento de lamivudina e zidovudina em comprimidos revestidos.” 2013. Web. 20 Jan 2021.
Vancouver:
Novaes ALdS. Tecnologia Analítica em processo (PAT): método espectroscópico como alternativa ao método clássico para uniformidade de conteúdo e doseamento de lamivudina e zidovudina em comprimidos revestidos. [Internet] [Masters thesis]. University of São Paulo; 2013. [cited 2021 Jan 20].
Available from: http://www.teses.usp.br/teses/disponiveis/9/9139/tde-26032014-160051/ ;.
Council of Science Editors:
Novaes ALdS. Tecnologia Analítica em processo (PAT): método espectroscópico como alternativa ao método clássico para uniformidade de conteúdo e doseamento de lamivudina e zidovudina em comprimidos revestidos. [Masters Thesis]. University of São Paulo; 2013. Available from: http://www.teses.usp.br/teses/disponiveis/9/9139/tde-26032014-160051/ ;
Temple University
16.
PALUKURU, UDAY P.
Development of Near Infrared Spectral Analysis for Native, Engineered and Degraded Cartilage.
Degree: PhD, 2014, Temple University
URL: http://digital.library.temple.edu/u?/p245801coll10,270245
► Bioengineering
Articular cartilage helps in the motion of the diarthroidal joints by providing a near frictionless load bearing surface. Identification of changes in articular cartilage…
(more)
▼ Bioengineering
Articular cartilage helps in the motion of the diarthroidal joints by providing a near frictionless load bearing surface. Identification of changes in articular cartilage chemical and structural properties that arise from degeneration and suboptimal tissue repair have been the target of many studies. Current methods that evaluate these changes frequently involve destructive specimen preparation. Thus there is a need to develop a method to accurately evaluate changes in cartilage during disease or repair processes. Fourier transform infrared (FTIR) spectroscopy in the mid-infrared (MIR) spectral range is based on molecular vibrations and has been used to study the chemical and structural properties of biological tissues, including cartilage. However, this technique generally requires extensive sample preparation and modification of the intact tissue. An alternative approach is to use near-infrared spectroscopy (NIRS) which does not require sample preparation due to higher depth of penetration. This doctoral dissertation focuses on identification of NIR spectral features to evaluate the major components of cartilage. These NIR spectral features are then used to evaluate compositional changes in engineered and degraded cartilage, and the results validated with histological, biochemical, mechanical and MIR analysis of the same tissue. Together, these studies lay the groundwork for clinical and in situ applications of NIRS.
Temple University – Theses
Advisors/Committee Members: Pleshko, Nancy, Achary, Patnala M., Lelkes, Peter I., Peridier, Vallorie J., Barbe, Mary F..
Subjects/Keywords: Biomedical engineering;
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APA (6th Edition):
PALUKURU, U. P. (2014). Development of Near Infrared Spectral Analysis for Native, Engineered and Degraded Cartilage. (Doctoral Dissertation). Temple University. Retrieved from http://digital.library.temple.edu/u?/p245801coll10,270245
Chicago Manual of Style (16th Edition):
PALUKURU, UDAY P. “Development of Near Infrared Spectral Analysis for Native, Engineered and Degraded Cartilage.” 2014. Doctoral Dissertation, Temple University. Accessed January 20, 2021.
http://digital.library.temple.edu/u?/p245801coll10,270245.
MLA Handbook (7th Edition):
PALUKURU, UDAY P. “Development of Near Infrared Spectral Analysis for Native, Engineered and Degraded Cartilage.” 2014. Web. 20 Jan 2021.
Vancouver:
PALUKURU UP. Development of Near Infrared Spectral Analysis for Native, Engineered and Degraded Cartilage. [Internet] [Doctoral dissertation]. Temple University; 2014. [cited 2021 Jan 20].
Available from: http://digital.library.temple.edu/u?/p245801coll10,270245.
Council of Science Editors:
PALUKURU UP. Development of Near Infrared Spectral Analysis for Native, Engineered and Degraded Cartilage. [Doctoral Dissertation]. Temple University; 2014. Available from: http://digital.library.temple.edu/u?/p245801coll10,270245
University of Iowa
17.
Norton, Dennis Thomas, Jr.
Type-II InAs/GaSb superlattice LEDs: applications for infrared scene projector systems.
Degree: PhD, Physics, 2013, University of Iowa
URL: https://ir.uiowa.edu/etd/5031
► Optoelectronic devices operating in the mid-wave (3-5 Μm) and long-wave (8-12 Μm) infrared (IR) regions of the electromagnetic spectrum are of a great interest…
(more)
▼ Optoelectronic devices operating in the
mid-wave (3-5 Μm) and long-wave (8-12 Μm)
infrared (IR) regions of the electromagnetic spectrum are of a great interest for academic and industrial applications. Due to the lack of atmospheric absorption, devices operating within these spectral bands are particularly useful for spectroscopy, imaging, and dynamic scene projection. Advanced IR imaging systems have created an intense need for laboratory-based
infrared scene projector (IRSP) systems which can be used for accurate simulation of real-world phenomena occurring in the IR. These IRSP systems allow for reliable, reproducible, safe, and cost-effective calibration of IR detector arrays. The current state-of-the-art technology utilized for the emitter source of IRSP systems is thermal pixel arrays (TPAs) which are based on thin film resistor technology. Thermal pixel array technology has fundamental limitations related to response time and maximum simulated apparent temperature, making them unsuitable for emulation of very hot (> 700 K) and rapidly evolving scenes.
Additionally, there exists a need for dual wavelength emitter arrays for IRSP systems dedicated to calibration of dual wavelength detector arrays. This need is currently met by combining the spectral output from two separate IRSP systems. This configuration requires precise alignment of the output from both systems and results in the maximum radiance being limited to approximately half that of the capability of a given emitter array due to the optics used to combine the outputs.
The high switching speed inherent to IR light-emitting diodes (LEDs) and the potential for high power output makes them an appealing candidate to replace the thermal pixel arrays used for IRSP systems. To this end, research has been carried out to develop and improve the device performance of IR LEDs based on InAs/GaSb type-II superlattices (T2SLs). A common method employed to achieve high brightness from LEDs is to incorporate multiple active regions, coupled by tunnel junctions. Tunnel junctions must provide adequate barriers to prevent carrier leakage, while at the same time remain low in tunneling resistance to prevent unwanted heating. The performance of two tunnel junction designs are compared in otherwise identical four stage InAs/GaSb superlattice LED (SLED) devices for application in IRSP systems.
This research culminated in the development of a 48 Μm pitch, 512$times512 individually addressable
mid-wave IR LED array based on a sixteen stage, InAs/GaSb T2SL device design. This array was hybridized to a read-in integrated circuit and exhibited a pixel yield greater than 95 %. Projections based on single element emitter results predict this array will be able to achieve a peak apparent temperature of 1350 K within the entire 3-5 Μm band. These results demonstrate the feasibility of emitter arrays intended for IRSP systems based on InAs/GaSb SLED devices.
Additionally, a dual wavelength 48 Μm pitch, 8x8 emitter array based on InAs/GaSb T2SL LEDs was…
Advisors/Committee Members: Boggess, Thomas F. (supervisor).
Subjects/Keywords: Emitter Array; Infrared Projection; Mid-Wave Infrared Light-Emitting Diode; Optoelectronics; Type-II Superlattice; Physics
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MLA ·
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APA (6th Edition):
Norton, Dennis Thomas, J. (2013). Type-II InAs/GaSb superlattice LEDs: applications for infrared scene projector systems. (Doctoral Dissertation). University of Iowa. Retrieved from https://ir.uiowa.edu/etd/5031
Chicago Manual of Style (16th Edition):
Norton, Dennis Thomas, Jr. “Type-II InAs/GaSb superlattice LEDs: applications for infrared scene projector systems.” 2013. Doctoral Dissertation, University of Iowa. Accessed January 20, 2021.
https://ir.uiowa.edu/etd/5031.
MLA Handbook (7th Edition):
Norton, Dennis Thomas, Jr. “Type-II InAs/GaSb superlattice LEDs: applications for infrared scene projector systems.” 2013. Web. 20 Jan 2021.
Vancouver:
Norton, Dennis Thomas J. Type-II InAs/GaSb superlattice LEDs: applications for infrared scene projector systems. [Internet] [Doctoral dissertation]. University of Iowa; 2013. [cited 2021 Jan 20].
Available from: https://ir.uiowa.edu/etd/5031.
Council of Science Editors:
Norton, Dennis Thomas J. Type-II InAs/GaSb superlattice LEDs: applications for infrared scene projector systems. [Doctoral Dissertation]. University of Iowa; 2013. Available from: https://ir.uiowa.edu/etd/5031
University of Sydney
18.
Ng, Wartini.
Contemporary data analytics for soil spectroscopy
.
Degree: 2019, University of Sydney
URL: http://hdl.handle.net/2123/21071
► No soil, no life. Know soil, know life. Soil provides the basis for life. To promote soil security, soil monitoring is essential. However, conventional methods…
(more)
▼ No soil, no life. Know soil, know life. Soil provides the basis for life. To promote soil security, soil monitoring is essential. However, conventional methods of soil analysis are costly and time-consuming. This thesis explores contemporary data analytics for analyzing soil infrared spectroscopy data. New data analytics take soil infrared spectral data and convert them to soil properties that are useful for assessing its conditions. This thesis deals with issues of sampling, spectral reduction techniques, deep learning models, and application in soil contamination assessment. Soil spectral data has to be trained using machine learning models to provide predictions for soil properties. The effect of sampling size and designs on the model performance were evaluated. Various ways of spectra data dimension reductions were explored using variable selection techniques to prevent model overfitting when a limited number of samples was available. To deal with large data collected from regional and national soil spectral libraries, deep learning techniques were explored. The convolutional neural network (CNN) was demonstrated as a highly accurate method for predicting soil properties on a large database. A method was derived to enable the interpretability of the CNN model. The application of infrared spectroscopy in screening soil contaminants (microplastics and petroleum hydrocarbons) were illustrated. Collectively, this thesis provides novel data analytics that enabled enhanced applications of infrared spectroscopy in soil science.
Subjects/Keywords: spectroscopy;
visible-near-infrared;
mid-infrared;
soil properties;
soil contaminants;
deep learning
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Manager
APA (6th Edition):
Ng, W. (2019). Contemporary data analytics for soil spectroscopy
. (Thesis). University of Sydney. Retrieved from http://hdl.handle.net/2123/21071
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Ng, Wartini. “Contemporary data analytics for soil spectroscopy
.” 2019. Thesis, University of Sydney. Accessed January 20, 2021.
http://hdl.handle.net/2123/21071.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ng, Wartini. “Contemporary data analytics for soil spectroscopy
.” 2019. Web. 20 Jan 2021.
Vancouver:
Ng W. Contemporary data analytics for soil spectroscopy
. [Internet] [Thesis]. University of Sydney; 2019. [cited 2021 Jan 20].
Available from: http://hdl.handle.net/2123/21071.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ng W. Contemporary data analytics for soil spectroscopy
. [Thesis]. University of Sydney; 2019. Available from: http://hdl.handle.net/2123/21071
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Lund
19.
Jönsson, Henrik.
The cosmic origin of fluorine and sulphur: Infrared
spectroscopic studies of red giants.
Degree: 2015, University of Lund
URL: https://lup.lub.lu.se/record/5385723
;
https://portal.research.lu.se/ws/files/5799640/5424062.pdf
► Disregarding the small primordial traces of the lightest elements, all metals have been formed in stellar processes, which means that the relative amount of metals…
(more)
▼ Disregarding the small primordial traces of the
lightest elements, all metals have been formed in stellar
processes, which means that the relative amount of metals in the
Universe increases for every stellar generation. This build-up of
elements is called chemical evolution and might be used both to
constrain stellar models as well as understanding the formation and
evolution of stellar populations. In this thesis I determine
abundances of two of the least studied elements, fluorine and
sulphur, in three different stellar populations in the Milky Way
using infrared spectroscopy of giants. Regarding fluorine the
chemical evolution is very unclear because the number of previous
observations are small. The cosmic origin of fluorine could still
be one or more of three different sources: asymptotic giant branch
stars, core-collapse supernovae, or the winds of Wolf-Rayet stars.
If the latter is confirmed by observations, fluorine would make a
great proxy for the determining whether the initial mass function
in the Bulge is different from the solar neighborhood, which has
been suggested in several other types of works, but not all. If
confirmed, that would tell us that the central parts of our Galaxy
have evolved differently than the local Disk. In the thesis I find
that all the fluorine in the solar neighborhood most likely was
produced by asymptotic giant branch stars, but at the same time
find possible indications of fluorine production by Wolf-Rayet
stars in the Bulge, indeed suggesting an initial mass function of
the Bulge that is skewed towards more massive stars as compared to
the solar neighborhood. When it comes to sulphur, there have been
several proposed trends for metal-poor stars. Interestingly some of
these observations cannot be explained with classic models of
Galactic evolution, thereby questioning some of our understanding
of the formation and evolution of the Milky Way. In this thesis I
find a Galactic evolution-trend of sulphur following the expected
trend from established models and cannot confirm any of the more
exotic trends.
Subjects/Keywords: Astronomy, Astrophysics and Cosmology; Chemical evolution; near-infrared and mid-infrared
spectroscopy; stellar abundances
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APA ·
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Manager
APA (6th Edition):
Jönsson, H. (2015). The cosmic origin of fluorine and sulphur: Infrared
spectroscopic studies of red giants. (Doctoral Dissertation). University of Lund. Retrieved from https://lup.lub.lu.se/record/5385723 ; https://portal.research.lu.se/ws/files/5799640/5424062.pdf
Chicago Manual of Style (16th Edition):
Jönsson, Henrik. “The cosmic origin of fluorine and sulphur: Infrared
spectroscopic studies of red giants.” 2015. Doctoral Dissertation, University of Lund. Accessed January 20, 2021.
https://lup.lub.lu.se/record/5385723 ; https://portal.research.lu.se/ws/files/5799640/5424062.pdf.
MLA Handbook (7th Edition):
Jönsson, Henrik. “The cosmic origin of fluorine and sulphur: Infrared
spectroscopic studies of red giants.” 2015. Web. 20 Jan 2021.
Vancouver:
Jönsson H. The cosmic origin of fluorine and sulphur: Infrared
spectroscopic studies of red giants. [Internet] [Doctoral dissertation]. University of Lund; 2015. [cited 2021 Jan 20].
Available from: https://lup.lub.lu.se/record/5385723 ; https://portal.research.lu.se/ws/files/5799640/5424062.pdf.
Council of Science Editors:
Jönsson H. The cosmic origin of fluorine and sulphur: Infrared
spectroscopic studies of red giants. [Doctoral Dissertation]. University of Lund; 2015. Available from: https://lup.lub.lu.se/record/5385723 ; https://portal.research.lu.se/ws/files/5799640/5424062.pdf
University of Rochester
20.
Yao, Yuhong (1985 - ).
Ytterbium fiber laser driven, multiwavelength femtosecond
optical system operating in the ultra-violet, visible,
near-infrared and mid-infrared.
Degree: PhD, 2015, University of Rochester
URL: http://hdl.handle.net/1802/30315
► Over the past decade, revolutionary progress has been realized in ultrafast optics which is opening the door to exciting opportunities ranging from optical physics to…
(more)
▼ Over the past decade, revolutionary progress has
been realized in ultrafast optics which is opening the door to
exciting opportunities ranging from optical physics to cutting-edge
optical engineering. Motivated by this research frontier, we have
developed a multi-wavelength
femtosecond optical system operating
in the UV, visible, near-IR and mid-IR and have solved a variety of
interesting challenges.
</br>
Driven by the
increasing industrial demands for scalable and robust femtosecond
sources, an Yb:fiber master-oscillator-power-amplifier (MOPA)
operating at 1.3 W, 1035 nm, 240 fs, 40 MHz is built. As the
potential solution for non-invasive vision correction at an
eye-safe wavelength, we report the first demonstration of
micro-machining of ophthalmic hydrogels employing an Yb:fiber
laser.
</br>
The advent of photonic crystal
fibers (PCFs) and supercontinuum generation (SC) has greatly
expanded the wavelength scalability of laser sources. To address
the limitations in spectral efficiency and coherence degradation of
conventional SC, we demonstrate an efficient, low noise and robust
femtosecond 1.3 μm source based on the two zero dispersion
wavelength (TZDW) PCF. Its excellent coherence property is measured
for the first time employing an unbalanced Michelson interferometer
we built.
</br>
Motivated by emerging
applications in the mid-IR molecular “fingerprint” region, we
report a novel scheme of femtosecond mid-IR generation based on
frequency down-conversion from the TZDW source which successfully
circumvents the energy constraints in prevalent Raman soliton based
sources. With its wavelength limited to ~5.5 μm, an improved
self-phase modulation enabled tunable mid-IR system is
demonstrated
and its broad operating wavelengths of 4.2 – 9 μm is
validated by the Czerny-Turner mid-IR spectrometer we built.
</br>
Laser projection display plays an
important role in the display industry thanks to its large color
gamut, small source étendue and high wall-plug efficiency. A novel
speckle-free red-green-blue (RGB) source is demonstrated in a
power-scalable manner which covers 192% NTSC color gamut (CIE
1976). To circumvent the shared issue in beam distortion of
frequency converted visible sources, a telecentric projection
illumination design based on liquid crystal on silicon (LCoS) is
reported.
</br>
Finally, a femtosecond UV
source is constructed via external frequency tripling from the
MOPA. The completed multi-wavelength optical system is synchronized
and studied for applications including UV/mid-IR dual color imaging
and black-light generation.
Subjects/Keywords: Coherenc; Supercontinuum generation; Mid-infrared; Laser projection display
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APA (6th Edition):
Yao, Y. (. -. ). (2015). Ytterbium fiber laser driven, multiwavelength femtosecond
optical system operating in the ultra-violet, visible,
near-infrared and mid-infrared. (Doctoral Dissertation). University of Rochester. Retrieved from http://hdl.handle.net/1802/30315
Chicago Manual of Style (16th Edition):
Yao, Yuhong (1985 - ). “Ytterbium fiber laser driven, multiwavelength femtosecond
optical system operating in the ultra-violet, visible,
near-infrared and mid-infrared.” 2015. Doctoral Dissertation, University of Rochester. Accessed January 20, 2021.
http://hdl.handle.net/1802/30315.
MLA Handbook (7th Edition):
Yao, Yuhong (1985 - ). “Ytterbium fiber laser driven, multiwavelength femtosecond
optical system operating in the ultra-violet, visible,
near-infrared and mid-infrared.” 2015. Web. 20 Jan 2021.
Vancouver:
Yao Y(-). Ytterbium fiber laser driven, multiwavelength femtosecond
optical system operating in the ultra-violet, visible,
near-infrared and mid-infrared. [Internet] [Doctoral dissertation]. University of Rochester; 2015. [cited 2021 Jan 20].
Available from: http://hdl.handle.net/1802/30315.
Council of Science Editors:
Yao Y(-). Ytterbium fiber laser driven, multiwavelength femtosecond
optical system operating in the ultra-violet, visible,
near-infrared and mid-infrared. [Doctoral Dissertation]. University of Rochester; 2015. Available from: http://hdl.handle.net/1802/30315
University of Rochester
21.
O’Loughlin, Trevor.
Mid-wave infrared resonant cavity detector.
Degree: PhD, 2020, University of Rochester
URL: http://hdl.handle.net/1802/35743
► Detectors in the mid-wave infrared region are designed to limit the amount of noise current produced, as this is often the limiting mechanism. III-V based…
(more)
▼ Detectors in the mid-wave infrared region are
designed to limit the amount of noise current produced, as this is
often the limiting mechanism. III-V based systems are one approach
to creating such detectors, as designs are flexible. However, they
are still limited by dark currents, produced by thermal excitations
within the material, leading to an increase in noise and a decrease
in quantum efficiency. The resonant cavity design will limit the
wavelength sensitivity, thereby enabling a decrease in background
current noise. The aim of the resonant cavity structure is to
decrease the dark current noise source by reducing the amount of
material needed to detect the signal light while confining the
light in such a way as to keep the quantum efficiency high,
enabling an increase in performance of III-V detectors.
The goal
of this thesis is to examine the effect of design parameters such
as mirror types and cavity construction on the performance of these
resonant cavity devices. Specific detectivity and quantum
efficiency are of specific importance, but notes are made to
spectral response and operating parameters (such as angle of
incidence and temperature). Models of these structures have been
shown to agree well with measurement and are adaptable to other
materials. Mirror composition plays a major role in light
confinement for absorption. The construction of cavities with a
spectral response bandwidth of less than 100 nm is shown. Careful
cavity construction has been shown to permit thin contact regions
without much degradation of performance. Device results are
presented for the various combinations of materials and conditions.
A 35 times decrease in dark current over its usual thicker design
was measured for an InAs based resonant cavity device. Angle and
thermal tuning of these devices is also examined with models and
measurements, to enable their further use. Tolerancing of the
devices is examined for future reference.
Subjects/Keywords: Detector; III-V; Infrared; Mid-wave; Resonant cavity
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Manager
APA (6th Edition):
O’Loughlin, T. (2020). Mid-wave infrared resonant cavity detector. (Doctoral Dissertation). University of Rochester. Retrieved from http://hdl.handle.net/1802/35743
Chicago Manual of Style (16th Edition):
O’Loughlin, Trevor. “Mid-wave infrared resonant cavity detector.” 2020. Doctoral Dissertation, University of Rochester. Accessed January 20, 2021.
http://hdl.handle.net/1802/35743.
MLA Handbook (7th Edition):
O’Loughlin, Trevor. “Mid-wave infrared resonant cavity detector.” 2020. Web. 20 Jan 2021.
Vancouver:
O’Loughlin T. Mid-wave infrared resonant cavity detector. [Internet] [Doctoral dissertation]. University of Rochester; 2020. [cited 2021 Jan 20].
Available from: http://hdl.handle.net/1802/35743.
Council of Science Editors:
O’Loughlin T. Mid-wave infrared resonant cavity detector. [Doctoral Dissertation]. University of Rochester; 2020. Available from: http://hdl.handle.net/1802/35743
Cornell University
22.
Fain, Romy M.
NEAR AND MID INFRARED DEVICES FOR DEEP MEDIA SENSING AND DETECTION.
Degree: PhD, Electrical and Computer Engineering, 2017, Cornell University
URL: http://hdl.handle.net/1813/56993
► This thesis provides components for a minimally invasive mid-infrared light-delivery, sensing and detection system in silicon. Both Photonic Needles for deep-media light delivery and a…
(more)
▼ This thesis provides components for a minimally invasive
mid-
infrared light-delivery, sensing and detection system in silicon. Both Photonic Needles for deep-media light delivery and a CMOS-compatible waveguide-integrated detector at 3.7μm are explored in depth. Other integratable elements presented include ring resonators in the
mid-
infrared for gas absorption sensing and frequency comb generation, a MEMS weak electric field sensor, and wavelength sensitive gratings for directional coupling to/from the environment.
Chapter 1 provides a primer for mechanical, optical, and electrical concepts related to the work later presented in this text. The mechanical primer covers Euler bucking theory as well as an intuitive perspective on stiffness, elastic modulus, second moment of inertia, and beam bending. The optical primer covers Snell’s law, ring resonators, Fresnel equations, Fabry-Perot resonances and losses, distributed Bragg reflectors, Bragg gratings, and optical coupling losses. The electrical primer covers the Fourier transform of a pulse train, noise equivalent power, loss due to impedance mismatch, and RC limited bandwidth.
In Chapter 2 we demonstrate a new platform for minimally invasive, light-delivery probes leveraging the maturing field of silicon photonics, enabling massively parallel fabrication of photonic structures. These Photonic Needles probes have sub-10μm cross-sectional dimensions, lengths greater than 3mm – surpassing 1000 to 1 aspect ratio, and are released completely into air without a substrate below. We show the Photonic Needles to be mechanically robust when inserted into 2% agarose. The propagation loss of these waveguides is low – on the order of 4dB/cm.
In Chapter 3 we demonstrate a CMOS-compatible
mid-
infrared detector at wavelengths ranging from 3.36 to 3.74μm by exciting
mid bandgap states in a sulfur-doped silicon waveguide with responsivities up to 30mA/W. We also measure a noise equivalent power (NEP) of 3e-10W/√Hz at 3.7μm wavelength and 30V reverse bias voltage.
Chapter 4 presents other device elements that could also be integrated into this same silicon on insulator (SOI) platform for long wavelengths with preliminary and/or simulation results for each. These elements could be implemented as part of future projects. Chapter 5 provides veins of promising future research directly related to the work from Chapters 2 and 3.
Advisors/Committee Members: Lipson, Michal (chair), Craighead, Harold G. (committee member), Pollock, Clifford Raymond (committee member).
Subjects/Keywords: silicon; Physics; Mid-Infrared; Neurosciences; photonics; Optics; Spectroscopy; minimally-invasive; neuro
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Export
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APA (6th Edition):
Fain, R. M. (2017). NEAR AND MID INFRARED DEVICES FOR DEEP MEDIA SENSING AND DETECTION. (Doctoral Dissertation). Cornell University. Retrieved from http://hdl.handle.net/1813/56993
Chicago Manual of Style (16th Edition):
Fain, Romy M. “NEAR AND MID INFRARED DEVICES FOR DEEP MEDIA SENSING AND DETECTION.” 2017. Doctoral Dissertation, Cornell University. Accessed January 20, 2021.
http://hdl.handle.net/1813/56993.
MLA Handbook (7th Edition):
Fain, Romy M. “NEAR AND MID INFRARED DEVICES FOR DEEP MEDIA SENSING AND DETECTION.” 2017. Web. 20 Jan 2021.
Vancouver:
Fain RM. NEAR AND MID INFRARED DEVICES FOR DEEP MEDIA SENSING AND DETECTION. [Internet] [Doctoral dissertation]. Cornell University; 2017. [cited 2021 Jan 20].
Available from: http://hdl.handle.net/1813/56993.
Council of Science Editors:
Fain RM. NEAR AND MID INFRARED DEVICES FOR DEEP MEDIA SENSING AND DETECTION. [Doctoral Dissertation]. Cornell University; 2017. Available from: http://hdl.handle.net/1813/56993
23.
Dory, Jean-Baptiste.
Matériaux chalcogénures innovants pour l’optique non linéaire intégrée dans le moyen infra rouge : chalcogenide materials for nonlinear integreted optics in mid-infrared.
Degree: Docteur es, Physique, 2019, Bourgogne Franche-Comté
URL: http://www.theses.fr/2019UBFCK075
► Élaborer et caractériser de nouvelles compositions de matériaux chalcogénures présentant des effets non linéaires pour l'optique intégrée et réalisation de guides d'onde à faible pertes…
(more)
▼ Élaborer et caractériser de nouvelles compositions de matériaux chalcogénures présentant des effets non linéaires pour l'optique intégrée et réalisation de guides d'onde à faible pertes de propagation.
Elaboration and characterization of new compositions of chalcogenide materials exhibiting nonlinear effects for integrated optic applications and fabrication of low-loss waveguides.
Advisors/Committee Members: Cluzel, Benoît (thesis director), Noé, Pierre (thesis director).
Subjects/Keywords: Chalcogénures; Photonique; Moyen infra-Rouge; Chalcogenides; Photonic; Mid-Infrared; 537
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APA (6th Edition):
Dory, J. (2019). Matériaux chalcogénures innovants pour l’optique non linéaire intégrée dans le moyen infra rouge : chalcogenide materials for nonlinear integreted optics in mid-infrared. (Doctoral Dissertation). Bourgogne Franche-Comté. Retrieved from http://www.theses.fr/2019UBFCK075
Chicago Manual of Style (16th Edition):
Dory, Jean-Baptiste. “Matériaux chalcogénures innovants pour l’optique non linéaire intégrée dans le moyen infra rouge : chalcogenide materials for nonlinear integreted optics in mid-infrared.” 2019. Doctoral Dissertation, Bourgogne Franche-Comté. Accessed January 20, 2021.
http://www.theses.fr/2019UBFCK075.
MLA Handbook (7th Edition):
Dory, Jean-Baptiste. “Matériaux chalcogénures innovants pour l’optique non linéaire intégrée dans le moyen infra rouge : chalcogenide materials for nonlinear integreted optics in mid-infrared.” 2019. Web. 20 Jan 2021.
Vancouver:
Dory J. Matériaux chalcogénures innovants pour l’optique non linéaire intégrée dans le moyen infra rouge : chalcogenide materials for nonlinear integreted optics in mid-infrared. [Internet] [Doctoral dissertation]. Bourgogne Franche-Comté; 2019. [cited 2021 Jan 20].
Available from: http://www.theses.fr/2019UBFCK075.
Council of Science Editors:
Dory J. Matériaux chalcogénures innovants pour l’optique non linéaire intégrée dans le moyen infra rouge : chalcogenide materials for nonlinear integreted optics in mid-infrared. [Doctoral Dissertation]. Bourgogne Franche-Comté; 2019. Available from: http://www.theses.fr/2019UBFCK075
Australian National University
24.
Yu, Yi.
Mid-Infrared Supercontinuum Generation in Chalcogenides
.
Degree: 2016, Australian National University
URL: http://hdl.handle.net/1885/113297
► Bright, broadband, mid-infrared (MIR) sources are useful for microscopy and spectroscopy as well as many other areas of science and technology. Among the available sources,…
(more)
▼ Bright, broadband, mid-infrared (MIR) sources are useful for
microscopy and spectroscopy as well as many other areas of
science and technology. Among the available sources,
supercontinuum (SC) sources stand out because of their high
brightness and continuous spectral coverage. SC generation
involve a range of nonlinear optical effects including self-phase
modulation, four-wave mixing, stimulated Raman scattering, etc.
Anomalous dispersion plays a major role and interacts with
nonlinearity leading to the creation of optical solitons that are
essential to create a broad spectrum.
The goal of this PhD was to generate practical, octave-spanning
MIR SC sources spanning at least 2-10 μm using optical
waveguides. To achieve this, firstly, it was necessary to
identify the best nonlinear materials for SC generation.
Chalcogenide glasses were chosen due to their high third-order
optical nonlinearity, low nonlinear absorption and good
transparency in the MIR. The potential of chalcogenides for SC
generation was first demonstrated using bulk samples leading to a
SC spectrum covering more than one octave.
A challenge with chalcogenides is that they typically have long
zero dispersion wavelengths (ZDWs) (beyond 5 μm) and this makes
it difficult to pump them directly in the anomalous dispersion
region. Two approaches were used to overcome this: 1) the
dispersion was engineered via waveguide design to shift the
anomalous region to shorter wavelengths; and 2) long-wavelength
femtosecond pump sources were developed with appropriate powers
to pump them.
Both optical fibers and planar waveguides were explored and the
measured SC spectra were compared with simulations based on the
split-step Fourier method. Dispersion-engineered, step-index
fibers were drawn by collaborators in China whilst
dispersion-engineered rib waveguides were fabricated in house.
Both allowed the first ZDWs to be shifted to wavelengths around 3
μm, however, ZDW below 3 μm was incompatible with the need for
the waveguide to operate to beyond 10 μm.
Simulations showed that MIR SC generation required a pump pulses
in the 3-5 μm band with duration of a few hundred fs. We
developed laser-seeded optical parametric amplifiers (OPA) pumped
with femtosecond pulses from mode-locked Yb lasers, to create
either 330 fs or 200 fs pulses tunable around 4 μm. In addition,
we demonstrated a method for chirping and compressing the OPA
pulses down to <60 fs which is needed to create a coherent SC
spectrum.
Combining the dispersion design and the femtosecond MIR OPA
system, SC spectra more than two octaves wide with moderate
average output powers (10s mW) were obtained from both fibers and
waveguides. For the step-index chalcogenide fibers, typical
experimental SC spectra covered the ranges of 2-10 μm or 2.2-12
μm depending on the fiber composition,…
Subjects/Keywords: nonlinear optics;
supercontinuum generation;
mid-infrared;
chalcogenide;
fibers;
planar waveguides
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Manager
APA (6th Edition):
Yu, Y. (2016). Mid-Infrared Supercontinuum Generation in Chalcogenides
. (Thesis). Australian National University. Retrieved from http://hdl.handle.net/1885/113297
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Yu, Yi. “Mid-Infrared Supercontinuum Generation in Chalcogenides
.” 2016. Thesis, Australian National University. Accessed January 20, 2021.
http://hdl.handle.net/1885/113297.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Yu, Yi. “Mid-Infrared Supercontinuum Generation in Chalcogenides
.” 2016. Web. 20 Jan 2021.
Vancouver:
Yu Y. Mid-Infrared Supercontinuum Generation in Chalcogenides
. [Internet] [Thesis]. Australian National University; 2016. [cited 2021 Jan 20].
Available from: http://hdl.handle.net/1885/113297.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Yu Y. Mid-Infrared Supercontinuum Generation in Chalcogenides
. [Thesis]. Australian National University; 2016. Available from: http://hdl.handle.net/1885/113297
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Cambridge
25.
Micallef, Fabian.
Middle infrared beam-steering using liquid crystals for spatial light modulation.
Degree: PhD, 2019, University of Cambridge
URL: https://www.repository.cam.ac.uk/handle/1810/292443
► Middle infrared beam-steering is attractive for a number of applications, particularly in the defence sector, where infrared countermeasures are a cornerstone in protecting lives and…
(more)
▼ Middle infrared beam-steering is attractive for a number of applications, particularly in the defence sector, where infrared countermeasures are a cornerstone in protecting lives and assets from infrared seeking weapons. Liquid crystal based alternatives to the current opto-mechanical state of the art are investigated, in particular electrically addressed optical phased arrays. Material and design challenges are addressed. CVD graphene is found to be an appropriate transparent conductor, with a sheet resistance < 1 k Ω / \square and an optical transmission > 97 % in the frequency band of interest. Liquid crystal BL-037 was found to have a birefringence of 0.23 in the middle infrared, where absorption bands exist between 3.3 μ m and 3.6 μ m, and at 4.5 μ m. When incorporated into a single-pixel anti-parallel aligned cell subject to an electric field, the response time for the liquid crystal layer was found to be slower than expected for typical thicknesses required for middle infrared operation (7.5 μ m - 30 μ m). This was due to high angle reorientation which is typically absent in visible operation. The effects of various considerations, such as aperture size and shape, illumination, pixelation, dead-space and fringing effects, on the performance of a spatial light modulator were investigated. Liquid crystal on silicon implementation was simulated. For λ= 2.3 μm an efficiency > 10 % was attained for angles up to 7∘ . For longer wavelengths this was attained for angles up to 11∘ . Multi-interaction and non-diffractive devices were investigated as alternatives for increasing the viewing range while preserving resolution.
Subjects/Keywords: mid-infrared; spatial light modulator; non-mechanical beam steering
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APA (6th Edition):
Micallef, F. (2019). Middle infrared beam-steering using liquid crystals for spatial light modulation. (Doctoral Dissertation). University of Cambridge. Retrieved from https://www.repository.cam.ac.uk/handle/1810/292443
Chicago Manual of Style (16th Edition):
Micallef, Fabian. “Middle infrared beam-steering using liquid crystals for spatial light modulation.” 2019. Doctoral Dissertation, University of Cambridge. Accessed January 20, 2021.
https://www.repository.cam.ac.uk/handle/1810/292443.
MLA Handbook (7th Edition):
Micallef, Fabian. “Middle infrared beam-steering using liquid crystals for spatial light modulation.” 2019. Web. 20 Jan 2021.
Vancouver:
Micallef F. Middle infrared beam-steering using liquid crystals for spatial light modulation. [Internet] [Doctoral dissertation]. University of Cambridge; 2019. [cited 2021 Jan 20].
Available from: https://www.repository.cam.ac.uk/handle/1810/292443.
Council of Science Editors:
Micallef F. Middle infrared beam-steering using liquid crystals for spatial light modulation. [Doctoral Dissertation]. University of Cambridge; 2019. Available from: https://www.repository.cam.ac.uk/handle/1810/292443
University of Colorado
26.
Krogstad, Molly Rebecca.
Ge-Sb-Se Chalcogenide Glass for Near- and Mid-Infrared Nonlinear Photonics.
Degree: PhD, 2018, University of Colorado
URL: https://scholar.colorado.edu/phys_gradetds/263
► The chalcogenide glass, Ge28Sb12Se60, is a promising material platform for compact, low-threshold nonlinear optical devices operating in the near- to mid-infrared. It is particularly attractive…
(more)
▼ The chalcogenide glass, Ge
28Sb
12Se
60, is a promising material platform for compact, low-threshold nonlinear optical devices operating in the near- to
mid-
infrared. It is particularly attractive given its wide range of transparency, large Kerr coefficient, and relatively weak multi-photon absorption. The nonlinear optical properties of Ge
28Sb
12Se
60 were investigated in bulk and waveguide forms, over a range of wavelengths from 1.0 to 3.5 μm. From z-scan measurements at 1.03 µm, using circularly polarized, 200 fs pulses at 374 kHz, bulk Ge
28Sb
12Se
60 glass was found to have a nonlinear refractive index ~130 times that of fused silica and a two-photon absorption coefficient of 3.5 cm/GW. Ge-Sb-Se waveguides and microresonators were designed and characterized, laying groundwork for the development of efficient, compact nonlinear devices such as frequency combs and optical switches. In particular, single-mode Ge-Sb-Se strip waveguides, fabricated by photo- or e-beam lithography, followed by thermal evaporation and lift-off, were demonstrated with average propagation losses of 11.8 dB/cm at 1.03 µm and 4.0-6.1 dB/cm at 1.55 µm. Nonlinear optical waveguides were characterized with measurements of spectral broadening and intensity-dependent transmission, revealing a large measured nonlinear figure of merit of 5.2±1.6 at 1.55 µm. Hybrid chalcogenide-silica wedge microresonators were characterized from 1500-1630 nm, with loaded quality factors up to 1.5x10
5 and thermal resonant shifts ~60.5 pm/˚C. Finally, planar chalcogenide-based ring resonators were designed for operation at 1.55 and 3.5 µm, simulating dispersion and optimizing waveguide dimensions for maximum four-wave mixing conversion efficiency. Ring resonators with 6- and 20-µm radii were demonstrated with intrinsic quality factors of 1-2x10
4 and 8.3x10
4, respectively.
Advisors/Committee Members: Juliet Gopinath, Scott Diddams, Thomas Schibli, Wounjhang Park, Robert McLeod.
Subjects/Keywords: chalcogenide; integrated optics; nonlinear optics; photonics; mid-infrared; Optics; Physics
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APA (6th Edition):
Krogstad, M. R. (2018). Ge-Sb-Se Chalcogenide Glass for Near- and Mid-Infrared Nonlinear Photonics. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/phys_gradetds/263
Chicago Manual of Style (16th Edition):
Krogstad, Molly Rebecca. “Ge-Sb-Se Chalcogenide Glass for Near- and Mid-Infrared Nonlinear Photonics.” 2018. Doctoral Dissertation, University of Colorado. Accessed January 20, 2021.
https://scholar.colorado.edu/phys_gradetds/263.
MLA Handbook (7th Edition):
Krogstad, Molly Rebecca. “Ge-Sb-Se Chalcogenide Glass for Near- and Mid-Infrared Nonlinear Photonics.” 2018. Web. 20 Jan 2021.
Vancouver:
Krogstad MR. Ge-Sb-Se Chalcogenide Glass for Near- and Mid-Infrared Nonlinear Photonics. [Internet] [Doctoral dissertation]. University of Colorado; 2018. [cited 2021 Jan 20].
Available from: https://scholar.colorado.edu/phys_gradetds/263.
Council of Science Editors:
Krogstad MR. Ge-Sb-Se Chalcogenide Glass for Near- and Mid-Infrared Nonlinear Photonics. [Doctoral Dissertation]. University of Colorado; 2018. Available from: https://scholar.colorado.edu/phys_gradetds/263
University of Colorado
27.
Maser, Daniel L.
Generation of Mid-Infrared Frequency Combs for Spectroscopic Applications.
Degree: PhD, 2017, University of Colorado
URL: https://scholar.colorado.edu/phys_gradetds/207
► Mid-infrared laser sources prove to be a valuable tool in exploring a vast array of phenomena, finding their way into applications ranging from trace…
(more)
▼ Mid-
infrared laser sources prove to be a valuable tool in exploring a vast array of phenomena, finding their way into applications ranging from trace gas detection to X-ray generation and carbon dating.
Mid-
infrared frequency combs, in particular, are well-suited for many of these applications, owing to their inherent low-noise and broadband nature. Frequency comb technology is well-developed in the near-
infrared as a result of immense technological development by the telecommunication industry in silica fiber and the existence of readily-available glass dopants such as ytterbium and erbium that enable oscillators at 1 and 1.5 μm. However, options become substantially more limited at longer wavelengths, as silica is no longer transparent and the components required in a
mid-
infrared frequency comb system (oscillators, fibers, and both fiber and free-space components) are far less technologically mature. This thesis explores several different approaches to generating frequency comb sources in the
mid-
infrared region, and the development of sources used in the nonlinear processes implemented to reach these wavelengths. An optical parametric oscillator, two approaches to difference frequency generation, and nonlinear spectral broadening in chip-scale waveguides are developed, characterized, and spectroscopic potential for these techniques is demonstrated. The source used for these nonlinear processes, the erbium-doped fiber amplifier, is also studied and discussed throughout the design and optimization process. The nonlinear optical processes critical to this work are numerically modeled and used to confirm and predict experimental behavior.
Advisors/Committee Members: Scott Diddams, Juliet Gopinath, Greg Rieker, Daniel Adams, Thomas Schibli.
Subjects/Keywords: frequency comb; mid-infrared; nonlinear optics; spectroscopy; Optics; Physics
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Export
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APA (6th Edition):
Maser, D. L. (2017). Generation of Mid-Infrared Frequency Combs for Spectroscopic Applications. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/phys_gradetds/207
Chicago Manual of Style (16th Edition):
Maser, Daniel L. “Generation of Mid-Infrared Frequency Combs for Spectroscopic Applications.” 2017. Doctoral Dissertation, University of Colorado. Accessed January 20, 2021.
https://scholar.colorado.edu/phys_gradetds/207.
MLA Handbook (7th Edition):
Maser, Daniel L. “Generation of Mid-Infrared Frequency Combs for Spectroscopic Applications.” 2017. Web. 20 Jan 2021.
Vancouver:
Maser DL. Generation of Mid-Infrared Frequency Combs for Spectroscopic Applications. [Internet] [Doctoral dissertation]. University of Colorado; 2017. [cited 2021 Jan 20].
Available from: https://scholar.colorado.edu/phys_gradetds/207.
Council of Science Editors:
Maser DL. Generation of Mid-Infrared Frequency Combs for Spectroscopic Applications. [Doctoral Dissertation]. University of Colorado; 2017. Available from: https://scholar.colorado.edu/phys_gradetds/207
28.
Spott, Alexander.
Heterogeneous Integration of Mid-infrared Lasers on Silicon.
Degree: 2018, University of California – eScholarship, University of California
URL: http://www.escholarship.org/uc/item/6zh632c8
► The mid-infrared spectral region, ~2–20 µm, is of interest for numerous sensing, medical, industrial, and military applications. The rovibrational transition energies of many important molecules…
(more)
▼ The mid-infrared spectral region, ~2–20 µm, is of interest for numerous sensing, medical, industrial, and military applications. The rovibrational transition energies of many important molecules fall within this region, making mid-infrared light particularly suitable for gas-sensing or material identification. Mid-infrared chemical bond spectroscopy of the earth’s atmosphere and planetary bodies helps improve our understanding of greenhouse gases, pollutants, and biochemical compositions. Defense technologies, including scene illumination and infrared counter-measures, benefit from high-power mid-infrared light sources. The atmospheric transmission windows in the ~3–5 µm and ~8–13 µm ranges can extend infrared technologies to longer distances for remote explosive detection, thermal imaging, and free-space communications. Silicon photonic integration promises to address many of these applications on an integrated, low-cost platform. For example, a diverse portfolio of photonic sensors can potentially be integrated on a single silicon chip. Resonators, multiplexers, modulators, phase shifters, frequency combs, detectors, and various other optical devices operating at wavelengths throughout the mid-infrared have already been demonstrated on silicon photonic waveguiding platforms. Heterogeneous integration, where III-V material layers are transferred above silicon waveguides by wafer- or die-bonding, has previously been applied to construct near-infrared lasers on silicon, however, prior to 2014 no mid-infrared laser source integrated on silicon had been reported. This thesis presents the heterogeneous silicon/III-V integration of mid-infrared InP-based type-I diode lasers for λ ≈ 2.0 µm, InP-based quantum cascade lasers (QCLs) for λ ≈ 4.8 µm, and GaSb-based interband cascade lasers (ICLs) for λ ≈ 3.7 µm. These Fabry-Perot and distributed feedback (DFB) lasers function above room temperature, are integrated on silicon substrates, and couple mid-infrared light into silicon waveguides. The design considerations, fabrication processes, and performance of each set of lasers are discussed in detail.
Subjects/Keywords: Electrical engineering; Lasers; Mid-infrared; Optoelectronics; Photonics; Semiconductor
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APA (6th Edition):
Spott, A. (2018). Heterogeneous Integration of Mid-infrared Lasers on Silicon. (Thesis). University of California – eScholarship, University of California. Retrieved from http://www.escholarship.org/uc/item/6zh632c8
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Spott, Alexander. “Heterogeneous Integration of Mid-infrared Lasers on Silicon.” 2018. Thesis, University of California – eScholarship, University of California. Accessed January 20, 2021.
http://www.escholarship.org/uc/item/6zh632c8.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Spott, Alexander. “Heterogeneous Integration of Mid-infrared Lasers on Silicon.” 2018. Web. 20 Jan 2021.
Vancouver:
Spott A. Heterogeneous Integration of Mid-infrared Lasers on Silicon. [Internet] [Thesis]. University of California – eScholarship, University of California; 2018. [cited 2021 Jan 20].
Available from: http://www.escholarship.org/uc/item/6zh632c8.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Spott A. Heterogeneous Integration of Mid-infrared Lasers on Silicon. [Thesis]. University of California – eScholarship, University of California; 2018. Available from: http://www.escholarship.org/uc/item/6zh632c8
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Heriot-Watt University
29.
Jiad, Khalid Mohammed.
Nonlinear dynamics of optically pumped laser.
Degree: PhD, 1993, Heriot-Watt University
URL: http://hdl.handle.net/10399/1403
Subjects/Keywords: 535; Mid infrared lasers
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APA (6th Edition):
Jiad, K. M. (1993). Nonlinear dynamics of optically pumped laser. (Doctoral Dissertation). Heriot-Watt University. Retrieved from http://hdl.handle.net/10399/1403
Chicago Manual of Style (16th Edition):
Jiad, Khalid Mohammed. “Nonlinear dynamics of optically pumped laser.” 1993. Doctoral Dissertation, Heriot-Watt University. Accessed January 20, 2021.
http://hdl.handle.net/10399/1403.
MLA Handbook (7th Edition):
Jiad, Khalid Mohammed. “Nonlinear dynamics of optically pumped laser.” 1993. Web. 20 Jan 2021.
Vancouver:
Jiad KM. Nonlinear dynamics of optically pumped laser. [Internet] [Doctoral dissertation]. Heriot-Watt University; 1993. [cited 2021 Jan 20].
Available from: http://hdl.handle.net/10399/1403.
Council of Science Editors:
Jiad KM. Nonlinear dynamics of optically pumped laser. [Doctoral Dissertation]. Heriot-Watt University; 1993. Available from: http://hdl.handle.net/10399/1403
Rice University
30.
Xia, Yang.
Suspended Si Ring Resonator for Mid-IR Application.
Degree: PhD, Engineering, 2013, Rice University
URL: http://hdl.handle.net/1911/77590
► Suspended ring resonators formed by both single-mode waveguide (SMW) and multi-mode waveguide (MMW) are designed, fabricated and characterized near 3.4 μm by thermal tuning and…
(more)
▼ Suspended ring resonators formed by both single-mode waveguide (SMW) and multi-mode waveguide (MMW) are designed, fabricated and characterized near 3.4 μm by thermal tuning and near 4.5 μm and 5.2 μm by tunable quantum cascade lasers. The dispersion property is analyzed by simulation in regards to frequency comb generation. The taper width is optimized for maximum coupling. Measurement setup is built up and described. For the SMW ring resonator, the intrinsic quality factor is fitted to be 6,800 and 16,000 near 5.2 μm and 4.5 μm, respectively. For the MMW ring resonator, it rises to 35,000 near 4.5 μm. Transmission spectrum distortion is observed at high input power, and is modeled as heat effect. Thermal tuning rate is experimentally confirmed at 0.21 nm/°C. Based on the measured distortion and heat simulation, absorption loss is estimated. All-optical modulation is conducted to estimate the response time of this process. It can be shown that main loss is from surface thus is reducible by improving surface quality. On-chip electrical heater is designed and preliminary experiment indicate the feasibility to pattern it with our Electron Beam Lithography system.
Advisors/Committee Members: Xu, Qianfan (advisor), Mittleman, Daniel M. (committee member), Kono, Junichiro (committee member).
Subjects/Keywords: Silicon photonics; Ring Resonator; Mid-infrared; Thermal tuning
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Manager
APA (6th Edition):
Xia, Y. (2013). Suspended Si Ring Resonator for Mid-IR Application. (Doctoral Dissertation). Rice University. Retrieved from http://hdl.handle.net/1911/77590
Chicago Manual of Style (16th Edition):
Xia, Yang. “Suspended Si Ring Resonator for Mid-IR Application.” 2013. Doctoral Dissertation, Rice University. Accessed January 20, 2021.
http://hdl.handle.net/1911/77590.
MLA Handbook (7th Edition):
Xia, Yang. “Suspended Si Ring Resonator for Mid-IR Application.” 2013. Web. 20 Jan 2021.
Vancouver:
Xia Y. Suspended Si Ring Resonator for Mid-IR Application. [Internet] [Doctoral dissertation]. Rice University; 2013. [cited 2021 Jan 20].
Available from: http://hdl.handle.net/1911/77590.
Council of Science Editors:
Xia Y. Suspended Si Ring Resonator for Mid-IR Application. [Doctoral Dissertation]. Rice University; 2013. Available from: http://hdl.handle.net/1911/77590
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Open Access Theses and Dissertations
