subject:(optical)

University of Johannesburg

1. Nhlapo, Thabiso J. Gain equalization of erbium doped fibre amplifiers with tuneable long-period gratings.

Degree: 2009, University of Johannesburg

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M.Ing.

This thesis is about the gain equalization of erbium doped fibre amplifiers (EDFA), which is a key technology for enabling wavelength-division multiplexed (WDM) optical… (more)

Subjects/Keywords: Optical amplifiers; Optical fibers; Optical communications

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APA (6^th Edition):

Nhlapo, T. J. (2009). Gain equalization of erbium doped fibre amplifiers with tuneable long-period gratings. (Thesis). University of Johannesburg. Retrieved from http://hdl.handle.net/10210/2176

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

Chicago Manual of Style (16^th Edition):

Nhlapo, Thabiso J. “Gain equalization of erbium doped fibre amplifiers with tuneable long-period gratings.” 2009. Thesis, University of Johannesburg. Accessed February 26, 2020. http://hdl.handle.net/10210/2176.

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

MLA Handbook (7^th Edition):

Nhlapo, Thabiso J. “Gain equalization of erbium doped fibre amplifiers with tuneable long-period gratings.” 2009. Web. 26 Feb 2020.

Vancouver:

Nhlapo TJ. Gain equalization of erbium doped fibre amplifiers with tuneable long-period gratings. [Internet] [Thesis]. University of Johannesburg; 2009. [cited 2020 Feb 26]. Available from: http://hdl.handle.net/10210/2176.

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

Council of Science Editors:

Nhlapo TJ. Gain equalization of erbium doped fibre amplifiers with tuneable long-period gratings. [Thesis]. University of Johannesburg; 2009. Available from: http://hdl.handle.net/10210/2176

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

University of Johannesburg

2. Botha, Roelene. Towards an integrated optic tuneable gain equalizer for erbium-doped fibre amplifiers.

Degree: 2009, University of Johannesburg

URL: http://hdl.handle.net/10210/2153

►

M.Ing.

Long distance optical communication systems experience a large degree of attenuation due to fibre losses, necessitating signal amplification. Erbium Doped Fibre Amplifiers (EDFAs) have… (more)

Subjects/Keywords: Optical amplifiers; Optical fibers; Optical communications

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APA (6^th Edition):

Botha, R. (2009). Towards an integrated optic tuneable gain equalizer for erbium-doped fibre amplifiers. (Thesis). University of Johannesburg. Retrieved from http://hdl.handle.net/10210/2153

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

Chicago Manual of Style (16^th Edition):

Botha, Roelene. “Towards an integrated optic tuneable gain equalizer for erbium-doped fibre amplifiers.” 2009. Thesis, University of Johannesburg. Accessed February 26, 2020. http://hdl.handle.net/10210/2153.

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

MLA Handbook (7^th Edition):

Botha, Roelene. “Towards an integrated optic tuneable gain equalizer for erbium-doped fibre amplifiers.” 2009. Web. 26 Feb 2020.

Vancouver:

Botha R. Towards an integrated optic tuneable gain equalizer for erbium-doped fibre amplifiers. [Internet] [Thesis]. University of Johannesburg; 2009. [cited 2020 Feb 26]. Available from: http://hdl.handle.net/10210/2153.

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

Council of Science Editors:

Botha R. Towards an integrated optic tuneable gain equalizer for erbium-doped fibre amplifiers. [Thesis]. University of Johannesburg; 2009. Available from: http://hdl.handle.net/10210/2153

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

University of Arizona

3. Lampen, Sara. Use of Pupil Mapping for Measurement of Linearly Field-dependent Aberrations .

Degree: 2013, University of Arizona

URL: http://hdl.handle.net/10150/311473

► Rather than measuring aberrations at several locations across the field to quantify the alignment of an optical system, we show how a simple measurement of… (more)

▼ Rather than measuring aberrations at several locations across the field to quantify the alignment of an optical system, we show how a simple measurement of the pupil mapping can be used to measure the off-axis performance of the system. This method uses the Abbe sine condition to relate the mapping between the entrance and the exit pupils, where the violations of the generalized sine condition are used to determine the pupil mapping error. From this pupil mapping, the linearly field-dependent aberrations can be calculated. One of the advantages to this method is that all of the test equipment can be aligned to the center of the field while making measurements of the off-axis performance, which reduces the uncertainty of the measurement. This advantage is particularly evident with systems or sub-systems that have large inherent aberrations where off-axis alignment tolerances are very tight. Additionally, in the Sine Condition Test (SCTest), the test equipment can be designed to compensate for the native Siedel coma in the system. This makes it more straightforward to measure the linearly field dependence of the aberrations. By reducing or removing coma, the measurement uncertainty is further reduced. This work begins by explaining the background of the Abbe sine condition, derivation of the pupil mapping error, and an overview of linearly field-dependent astigmatism that arises from misalignment. Next, the general method of implementation is discussed, and expanded further by exploring the two different source options: a point source with a grating or a flat-panel display. Experimental results from proof of concept systems are shown for both cases. Next, this dissertation explains how the SCTest can be implemented on more complex systems. Last, this dissertation shows how the linear aberrations, along with constant field-dependent aberrations, can be used to align a system. Here, the application of the alignment version of the SCTest on a three mirror anastigmat (TMA) is discussed. Using simulation, this dissertation then investigates the behavior of the alignment SCTest for various levels of mirror misalignment, mirror fabrication errors, and misalignment of the test equipment. All of these tests show that the alignment SCTest can successfully align an optical system. Advisors/Committee Members: Burge, James H (advisor), Burge, James H. (committeemember), Dubin, Matthew (committeemember), Hua, Hong (committeemember), Sasin, Jose (committeemember).

Subjects/Keywords: Optical Alignment; Optical Testing; Optical Sciences; Abberrations

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

APA (6^th Edition):

Lampen, S. (2013). Use of Pupil Mapping for Measurement of Linearly Field-dependent Aberrations . (Doctoral Dissertation). University of Arizona. Retrieved from http://hdl.handle.net/10150/311473

Chicago Manual of Style (16^th Edition):

Lampen, Sara. “Use of Pupil Mapping for Measurement of Linearly Field-dependent Aberrations .” 2013. Doctoral Dissertation, University of Arizona. Accessed February 26, 2020. http://hdl.handle.net/10150/311473.

MLA Handbook (7^th Edition):

Lampen, Sara. “Use of Pupil Mapping for Measurement of Linearly Field-dependent Aberrations .” 2013. Web. 26 Feb 2020.

Vancouver:

Lampen S. Use of Pupil Mapping for Measurement of Linearly Field-dependent Aberrations . [Internet] [Doctoral dissertation]. University of Arizona; 2013. [cited 2020 Feb 26]. Available from: http://hdl.handle.net/10150/311473.

Council of Science Editors:

Lampen S. Use of Pupil Mapping for Measurement of Linearly Field-dependent Aberrations . [Doctoral Dissertation]. University of Arizona; 2013. Available from: http://hdl.handle.net/10150/311473

University of Bath

4. Harrington, Kerrianne. Manipulation of mode coupling in optical fibres.

Degree: PhD, 2019, University of Bath

URL: https://researchportal.bath.ac.uk/en/studentthesis/manipulation-of-mode-coupling-in-optical-fibres(69558797-b547-41b0-be8c-c9c366c2bcb9).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.782250

► In recent years, as the technology that underpins optical fibre fabrication and development has matured, the scope for potential uses of these fibres has rapidly… (more)

▼ In recent years, as the technology that underpins optical fibre fabrication and development has matured, the scope for potential uses of these fibres has rapidly expanded. Initially developed for the telecommunications industry, optical fibres have found their uses across a diverse range of subjects including medical diagnostics, guided wave nonlinear optical processes such as supercontinuum generation, light collection in astrophotonics, and of course the ubiquitous telecommunications industry. The results of all of these applications are, in part, governed by how light is confined and is able to propagate along the optical axis in these structures, in what is termed a mode. Depending on the transverse structure of the fibre, different modes with different properties may be confined. Changes in the transverse structure along the propagation length can allow light to couple from one optical mode to another. These changes, for example induced by post-processing the fibre on a custom-built fibre tapering rig, must satisfy certain adiabatic criteria in order to be low loss, but also can take on a variety of different spatial profiles to fit the given task. If instead of a single core, a fibre contains multiple cores, all of which are able to confine electromagnetic radiation, light input into a mode of one core may couple across to the other local modes of the surrounding cores. In some applications, such as multi-core imaging fibres, it is important to suppress this effect in order to achieve better imaging. In other cases, such as the fibres for sensing or telecommunication, the coupling can give useful information about the state launched at the input facet of the fibre. This thesis presents the design, and fabrication of different optical fibres where the realisation of mode manipulation through changes in the fibre scale along the propagation axis can achieve specific useful functionalities. The work contained in this thesis focuses on three particular applications: medical imaging, telecommunications and astrophotonics. First, a novel multi-core imaging fibre was developed for medical imaging in the distal lungs. These imaging fibres provide low core to core coupling for high imaging quality across visible wavelengths. Fibres are also fabricated for the telecommunications industry to allow longitudinal structural changes over arbitrary length scales without the detrimental effects of loss. Finally, fibres for astronomy are presented. The first post-processed fibre presented for this application can sense the incoming wavefront of a beam of light, and the second device is a re-formatter that can convert the circularly symmetric mode of an optical fibre to a pseudo-slit shape that is compatible with on-sky spectrographs. The wavefront sensor presented in this thesis is a proof of concept and is only capable of sensing 1D tilts. The linear pseudo-slit output structure achieves a diffraction limited pattern in one direction, potentially able to reduce spurious intensity variations in spectroscopic systems.

Subjects/Keywords: optical fibre; optical imaging; optical fibre fabrication

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APA (6^th Edition):

Harrington, K. (2019). Manipulation of mode coupling in optical fibres. (Doctoral Dissertation). University of Bath. Retrieved from https://researchportal.bath.ac.uk/en/studentthesis/manipulation-of-mode-coupling-in-optical-fibres(69558797-b547-41b0-be8c-c9c366c2bcb9).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.782250

Chicago Manual of Style (16^th Edition):

Harrington, Kerrianne. “Manipulation of mode coupling in optical fibres.” 2019. Doctoral Dissertation, University of Bath. Accessed February 26, 2020. https://researchportal.bath.ac.uk/en/studentthesis/manipulation-of-mode-coupling-in-optical-fibres(69558797-b547-41b0-be8c-c9c366c2bcb9).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.782250.

MLA Handbook (7^th Edition):

Harrington, Kerrianne. “Manipulation of mode coupling in optical fibres.” 2019. Web. 26 Feb 2020.

Vancouver:

Harrington K. Manipulation of mode coupling in optical fibres. [Internet] [Doctoral dissertation]. University of Bath; 2019. [cited 2020 Feb 26]. Available from: https://researchportal.bath.ac.uk/en/studentthesis/manipulation-of-mode-coupling-in-optical-fibres(69558797-b547-41b0-be8c-c9c366c2bcb9).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.782250.

Council of Science Editors:

Harrington K. Manipulation of mode coupling in optical fibres. [Doctoral Dissertation]. University of Bath; 2019. Available from: https://researchportal.bath.ac.uk/en/studentthesis/manipulation-of-mode-coupling-in-optical-fibres(69558797-b547-41b0-be8c-c9c366c2bcb9).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.782250

University of Hong Kong

5. Zhou, Yue. Fiber optical parametric generation of widely tunable source: continuous-wave to sub-pricosecondregime.

Degree: PhD, 2012, University of Hong Kong

URL: Zhou, Y. [周月]. (2012). Fiber optical parametric generation of widely tunable source : continuous-wave to sub-pricosecond regime. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b4961772 ; http://dx.doi.org/10.5353/th_b4961772 ; http://hdl.handle.net/10722/180952

► Optical source generation has attracted significant attention recently, especially in fiber optical communications. Today there is a growing a demand for optical source generation beyond… (more)

▼ Optical source generation has attracted significant attention recently, especially in fiber optical communications. Today there is a growing a demand for optical source generation beyond conventional telecommunication wavelength bands. However, high quality and versatile optical source is generally not available over those wavelength bands due to the lack of efficient gain medium. Thanks to fiber optical parametric amplifier (FOPA), which is based on the third order nonlinear susceptibility of optical fibers, offers ultrafast response, wide-gain bandwidth, high gain and large frequency detune from the pump, serves as a promising candidate for signal amplification over those wavelength bands. By using the corresponding fiber optical parametric oscillator (FOPO) configuration, widely tunable source from continuous-wave (CW) to sub-picosecond pulses can be potentially generated to serve different applications from communication to biomedical imaging. In this thesis, we first demonstrate an all-fiber widely-tunable picosecond FOPO using highly-nonlinear fiber (HNLF). The tuning range is as wide as 250 nm, which is higher than previous picosecond FOPOs reported in the 1550-nm region. Second, time-dispersion tuning of the FOPO is investigated with fixed pump wavelength. It is a relatively simple and economic approach, and there will be no filter induced cavity loss. We then describe using FOPO to generated nearly-transform limited sub-picosecond pulses with a 60-nm tuning range. Another FOPO with a tuning range of 440-nm with dispersion-shifted fiber (DSF) as the gain medium is proposed and demonstrated. Compared with FOPOs demonstrated using HNLF as the gain medium, the use of DSF offers two key advantages: a wider tuning range and a narrower linewidth. In addition to picosecond FOPO, CW FOPO is also of great interest in fiber optical communications and biomedical imaging. We also demonstrate an all-fiber CW single-longitudinal-mode (SLM) FOPO with tuning range covers the S and L bands. SLM oscillation with a side-mode suppression ratio greater than 43 dB is achieved, which has been extended to 1-μm region under stable operation. Apart from static tuning, dynamic wavelength tuning of the FOPO is also discussed in this thesis with a cumulative speed exceeds 4,000,000 nm/s, which is higher than previous work reported in wavelength-swept FOPOs. The high-speed swept source would be useful in biomedical imaging and sensing applications. The amplification of the sub-picosecond pulses of the FOPO output is also investigated, for the first time to our knowledge, by using a fiber optical parametric chirped pulse amplifier(FOPCPA).The totally fiber-integrated nature of the whole system allows complete self-alignment and further integration to other fiber-based systems. All these research effort will show the versatility of FOPO techniques for generating wide range of optical sources for varies applications. These schemes may be useful in generating CW and short pulse for potential optical communication and biomedical imaging in…

Subjects/Keywords: Optical parametric oscillators.; Optical fibers.

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APA (6^th Edition):

Zhou, Y. (2012). Fiber optical parametric generation of widely tunable source: continuous-wave to sub-pricosecondregime. (Doctoral Dissertation). University of Hong Kong. Retrieved from Zhou, Y. [周月]. (2012). Fiber optical parametric generation of widely tunable source : continuous-wave to sub-pricosecond regime. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b4961772 ; http://dx.doi.org/10.5353/th_b4961772 ; http://hdl.handle.net/10722/180952

Chicago Manual of Style (16^th Edition):

Zhou, Yue. “Fiber optical parametric generation of widely tunable source: continuous-wave to sub-pricosecondregime.” 2012. Doctoral Dissertation, University of Hong Kong. Accessed February 26, 2020. Zhou, Y. [周月]. (2012). Fiber optical parametric generation of widely tunable source : continuous-wave to sub-pricosecond regime. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b4961772 ; http://dx.doi.org/10.5353/th_b4961772 ; http://hdl.handle.net/10722/180952.

MLA Handbook (7^th Edition):

Zhou, Yue. “Fiber optical parametric generation of widely tunable source: continuous-wave to sub-pricosecondregime.” 2012. Web. 26 Feb 2020.

Vancouver:

Zhou Y. Fiber optical parametric generation of widely tunable source: continuous-wave to sub-pricosecondregime. [Internet] [Doctoral dissertation]. University of Hong Kong; 2012. [cited 2020 Feb 26]. Available from: Zhou, Y. [周月]. (2012). Fiber optical parametric generation of widely tunable source : continuous-wave to sub-pricosecond regime. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b4961772 ; http://dx.doi.org/10.5353/th_b4961772 ; http://hdl.handle.net/10722/180952.

Council of Science Editors:

Zhou Y. Fiber optical parametric generation of widely tunable source: continuous-wave to sub-pricosecondregime. [Doctoral Dissertation]. University of Hong Kong; 2012. Available from: Zhou, Y. [周月]. (2012). Fiber optical parametric generation of widely tunable source : continuous-wave to sub-pricosecond regime. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b4961772 ; http://dx.doi.org/10.5353/th_b4961772 ; http://hdl.handle.net/10722/180952

University of Johannesburg

6. Burger, Johan Petrus. 'n Erbiumgedoteerde vesellasersensor met Braggroosterspieëls.

Degree: 2014, University of Johannesburg

URL: http://hdl.handle.net/10210/9178

►

M.Eng. (Electrical and Electronic Engineering)

An in-fibre Bragg grating is a period perturbation of the refractive index of the core of an optical fibre, where… (more)

Subjects/Keywords: Optical fibers; Optical detectors

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APA (6^th Edition):

Burger, J. P. (2014). 'n Erbiumgedoteerde vesellasersensor met Braggroosterspieëls. (Thesis). University of Johannesburg. Retrieved from http://hdl.handle.net/10210/9178

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

Chicago Manual of Style (16^th Edition):

Burger, Johan Petrus. “'n Erbiumgedoteerde vesellasersensor met Braggroosterspieëls.” 2014. Thesis, University of Johannesburg. Accessed February 26, 2020. http://hdl.handle.net/10210/9178.

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

MLA Handbook (7^th Edition):

Burger, Johan Petrus. “'n Erbiumgedoteerde vesellasersensor met Braggroosterspieëls.” 2014. Web. 26 Feb 2020.

Vancouver:

Burger JP. 'n Erbiumgedoteerde vesellasersensor met Braggroosterspieëls. [Internet] [Thesis]. University of Johannesburg; 2014. [cited 2020 Feb 26]. Available from: http://hdl.handle.net/10210/9178.

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

Council of Science Editors:

Burger JP. 'n Erbiumgedoteerde vesellasersensor met Braggroosterspieëls. [Thesis]. University of Johannesburg; 2014. Available from: http://hdl.handle.net/10210/9178

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

University of Johannesburg

7. Zhu, Yinian. Fabrication of long-period gratings and their applications in optical fibre communications and sensing systems.

Degree: 2009, University of Johannesburg

URL: http://hdl.handle.net/10210/2190

►

D.Phil.

This dissertation deals with the fabrication, characterisation, and applications of long-period gratings in optical fibre communications and sensing systems. The aim of this project… (more)

▼

D.Phil.

This dissertation deals with the fabrication, characterisation, and applications of long-period gratings in optical fibre communications and sensing systems. The aim of this project is to assess long-period gratings as media for active or passive fibre devices, particularly as components for the telecommunications industry. A review of the properties and characteristics of fibre gratings associated with the photosensitivity of germanosilicate fibres is provided, which includes a theoretical analysis of the principles of operation for short-period gratings (fibre Bragg gratings) and long-period gratings. The simulations of the spectral response from these two types of gratings are also presented. A number of long-period grating fabrication methods and techniques, which were reported by some researchers, are reviewed. In this project, the normal long-period gratings and phase-shifted long-period gratings are fabricated by using a line-narrowed KrF excimer laser combined with the metal amplitude mask technique. The metal mask is made of a stainless steel sheet, and the slot width (periodicity) is processed by using high quality photographic tooling. Three normal long-period gratings with different periodicities and one phase-shifted long-period grating can be manufactured simultaneously because there are four metal masks imprinted in one inexpensive stainless steel sheet. The mass-production of long-period gratings becomes possible, and the number of gratings that can be written is limited only by the excimer laser beam or metal mask dimension orthogonal to the fibre axis. The fibres that are used in our experiments are photosensitive optical fibres (PS1500). Long-period gratings can be written directly into these fibres without hydrogenation. Two types of long-period grating devices are investigated and developed for applications in dense wavelength division multiplexing (DWDM)networks: erbium-doped fibre amplifier (EDFA) gain-flattening filters and wavelength-tuneable add/drop multiplexers. Firstly, the transmission characteristics of phase-shifted long-period gratings are simulated theoretically by a combination of the coupled-mode theory and the fundamental-matrix method. It is suggested that a phase-shifted long-period grating device cascaded with another normal long-period grating can be used to flatten the gain spectrum of an EDFA containing three gain peaks. The experimental results show that a broad amplifier with peak-to-peak variations of less than 0.7 dB over 36 nm from 1526 to 1562 nm, which covers the entire C-band of the EDFA, can be realized practically. Next, a wavelength-tuneable add/drop multiplexer is designed and configured. In this device, four identical long-period gratings are assembled on piezoelectric ceramic fibre stretchers. The modelling of the device predicts that 50 ITU DWDM-channel signals could be selected in the wavelength range from 1526.25 to 1563.75 nm with 0.75 nm channel spacing and the cross-talk is less than –39 dB while the total insertion loss is about 0.24 dB. There…

Subjects/Keywords: Optical communications; Optical fiber detectors

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APA (6^th Edition):

Zhu, Y. (2009). Fabrication of long-period gratings and their applications in optical fibre communications and sensing systems. (Thesis). University of Johannesburg. Retrieved from http://hdl.handle.net/10210/2190

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

Chicago Manual of Style (16^th Edition):

Zhu, Yinian. “Fabrication of long-period gratings and their applications in optical fibre communications and sensing systems.” 2009. Thesis, University of Johannesburg. Accessed February 26, 2020. http://hdl.handle.net/10210/2190.

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

MLA Handbook (7^th Edition):

Zhu, Yinian. “Fabrication of long-period gratings and their applications in optical fibre communications and sensing systems.” 2009. Web. 26 Feb 2020.

Vancouver:

Zhu Y. Fabrication of long-period gratings and their applications in optical fibre communications and sensing systems. [Internet] [Thesis]. University of Johannesburg; 2009. [cited 2020 Feb 26]. Available from: http://hdl.handle.net/10210/2190.

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

Council of Science Editors:

Zhu Y. Fabrication of long-period gratings and their applications in optical fibre communications and sensing systems. [Thesis]. University of Johannesburg; 2009. Available from: http://hdl.handle.net/10210/2190

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

University of Johannesburg

8. Menyennett, Calvin. Constrained sequences and codes for binary asymmetrical optical channels.

Degree: 2014, University of Johannesburg

URL: http://hdl.handle.net/10210/9772

►

M.Ing. (Electrical and Electronic Engineering)

During the past decade the optical disc has become increasingly popular. Write-once optical recording systems will mainly be used in… (more)

Subjects/Keywords: Optical communications; Optical disks

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APA (6^th Edition):

Menyennett, C. (2014). Constrained sequences and codes for binary asymmetrical optical channels. (Thesis). University of Johannesburg. Retrieved from http://hdl.handle.net/10210/9772

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

Chicago Manual of Style (16^th Edition):

Menyennett, Calvin. “Constrained sequences and codes for binary asymmetrical optical channels.” 2014. Thesis, University of Johannesburg. Accessed February 26, 2020. http://hdl.handle.net/10210/9772.

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

MLA Handbook (7^th Edition):

Menyennett, Calvin. “Constrained sequences and codes for binary asymmetrical optical channels.” 2014. Web. 26 Feb 2020.

Vancouver:

Menyennett C. Constrained sequences and codes for binary asymmetrical optical channels. [Internet] [Thesis]. University of Johannesburg; 2014. [cited 2020 Feb 26]. Available from: http://hdl.handle.net/10210/9772.

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

Council of Science Editors:

Menyennett C. Constrained sequences and codes for binary asymmetrical optical channels. [Thesis]. University of Johannesburg; 2014. Available from: http://hdl.handle.net/10210/9772

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

Ryerson University

9. Pu, Xiaojun (Sean). Fiber loop ring-down spectroscopy with a long-period grating cavity.

Degree: 2009, Ryerson University

URL: https://digital.library.ryerson.ca/islandora/object/RULA%3A1096

► Cavity Ring-down spectroscopy is an absorption detection technique that makes the[sic]use of an optical cavity to realize a long effective optical path length through a… (more)

Subjects/Keywords: \Optical spectroscopy; Optical fiber detectors

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APA (6^th Edition):

Pu, X. (. (2009). Fiber loop ring-down spectroscopy with a long-period grating cavity. (Thesis). Ryerson University. Retrieved from https://digital.library.ryerson.ca/islandora/object/RULA%3A1096

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

Chicago Manual of Style (16^th Edition):

Pu, Xiaojun (Sean). “Fiber loop ring-down spectroscopy with a long-period grating cavity.” 2009. Thesis, Ryerson University. Accessed February 26, 2020. https://digital.library.ryerson.ca/islandora/object/RULA%3A1096.

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

MLA Handbook (7^th Edition):

Pu, Xiaojun (Sean). “Fiber loop ring-down spectroscopy with a long-period grating cavity.” 2009. Web. 26 Feb 2020.

Vancouver:

Pu X(. Fiber loop ring-down spectroscopy with a long-period grating cavity. [Internet] [Thesis]. Ryerson University; 2009. [cited 2020 Feb 26]. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A1096.

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

Council of Science Editors:

Pu X(. Fiber loop ring-down spectroscopy with a long-period grating cavity. [Thesis]. Ryerson University; 2009. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A1096

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

University of Melbourne

10. TANG, YAN. High-speed optical transmission system using coherent optical orthogonal frequency-division multiplexing.

Degree: 2010, University of Melbourne

URL: http://hdl.handle.net/11343/35389

► Recently, Coherent Optical Orthogonal Frequency-division Multiplexing (CO-OFDM) has been considered as a promising technology for high-speed optical transmission due to its easiness of dispersion compensation,… (more)

▼ Recently, Coherent Optical Orthogonal Frequency-division Multiplexing (CO-OFDM) has been considered as a promising technology for high-speed optical transmission due to its easiness of dispersion compensation, high optical spectral efficiency and superior scalability over the channel dispersion and data rate. In this thesis, we conduct analysis on the transceiver nonlinearity impact on a coherent optical Orthogonal Frequency-division Multiplexing (OFDM) system and the feasibility of transmitting up to 1 Tb/s per channel data rate over CO-OFDM WDM systems. We investigate the optimum design for a CO-OFDM transmitter using an optical In-phase/Quadrature (I/Q) modulator and show by simulation that in contrast to the direct-detected system, the optimal modulator bias point for the coherent system is π, or the null point of the modulator. We also propose and demonstrate through simulation a transmitter side digital signal processing technique including digital clipping and digital pre-distortion to compensate the nonlinearity induced by the OFDM peak-to-average power ratio effect and Mach–Zehnder modulator (MZM). Furthermore, we conduct analysis on the study of nonlinearity and dynamic range for a CO-OFDM receiver induced by the imbalance between the two ports of a balanced receiver. The input power dynamic range and tolerance to the relative-intensity-noise (RIN) are analyzed for the coherent balanced-receiver. We then explore the transmission performance for high speed wavelength-division multiplexing (WDM) CO-OFDM systems with up to 1Tb/s per channel data rate under the impact of fiber nonlinearity. We find that the optimum fiber launch power increases almost linearly with the increase of data rate. A 7 dB optimum launch power difference is observed between 107-Gb/s and 1.07-Tb/s CO-OFDM systems. We also investigate the dispersion compensation fiber impact and filter concatenation effect issues when upgrading the 10-Gb/s to the future 100-Gb/s CO-OFDM systems. We identify three contributions to the Q degradation for the inline dispersion compensated WDM systems. We show that due to the high spectral efficiency, 100-Gb/s CO-OFDM signals have very high tolerance to the filter narrowing effect, and are resilient to the group ripples from the filter concatenation effect.

Subjects/Keywords: optical communication; coherent optical OFDM

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APA (6^th Edition):

TANG, Y. (2010). High-speed optical transmission system using coherent optical orthogonal frequency-division multiplexing. (Doctoral Dissertation). University of Melbourne. Retrieved from http://hdl.handle.net/11343/35389

Chicago Manual of Style (16^th Edition):

TANG, YAN. “High-speed optical transmission system using coherent optical orthogonal frequency-division multiplexing.” 2010. Doctoral Dissertation, University of Melbourne. Accessed February 26, 2020. http://hdl.handle.net/11343/35389.

MLA Handbook (7^th Edition):

TANG, YAN. “High-speed optical transmission system using coherent optical orthogonal frequency-division multiplexing.” 2010. Web. 26 Feb 2020.

Vancouver:

TANG Y. High-speed optical transmission system using coherent optical orthogonal frequency-division multiplexing. [Internet] [Doctoral dissertation]. University of Melbourne; 2010. [cited 2020 Feb 26]. Available from: http://hdl.handle.net/11343/35389.

Council of Science Editors:

TANG Y. High-speed optical transmission system using coherent optical orthogonal frequency-division multiplexing. [Doctoral Dissertation]. University of Melbourne; 2010. Available from: http://hdl.handle.net/11343/35389

University of Melbourne

11. Wang, Peng. The energy efficiency of EDFA and Raman Fiber Amplifier.

Degree: 2016, University of Melbourne

URL: http://hdl.handle.net/11343/124032

► Optical fibre links using optical amplifiers in combination with advanced modulation formats and Forward Error Correction (FEC) are promising technologies to increase transmission distance as… (more)

Subjects/Keywords: Optical fibre network; Optical amplifier

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APA (6^th Edition):

Wang, P. (2016). The energy efficiency of EDFA and Raman Fiber Amplifier. (Masters Thesis). University of Melbourne. Retrieved from http://hdl.handle.net/11343/124032

Chicago Manual of Style (16^th Edition):

Wang, Peng. “The energy efficiency of EDFA and Raman Fiber Amplifier.” 2016. Masters Thesis, University of Melbourne. Accessed February 26, 2020. http://hdl.handle.net/11343/124032.

MLA Handbook (7^th Edition):

Wang, Peng. “The energy efficiency of EDFA and Raman Fiber Amplifier.” 2016. Web. 26 Feb 2020.

Vancouver:

Wang P. The energy efficiency of EDFA and Raman Fiber Amplifier. [Internet] [Masters thesis]. University of Melbourne; 2016. [cited 2020 Feb 26]. Available from: http://hdl.handle.net/11343/124032.

Council of Science Editors:

Wang P. The energy efficiency of EDFA and Raman Fiber Amplifier. [Masters Thesis]. University of Melbourne; 2016. Available from: http://hdl.handle.net/11343/124032

University of Adelaide

12. Bekteshi, Mustaf Raif. [EMBARGOED] Mechanical and optical characterisation of glass optical fibres for sensing applications.

Degree: 2019, University of Adelaide

URL: http://hdl.handle.net/2440/121351

► The capacity of glass optical fibres to handle stress experienced in sensing application is critical in many areas including biomedical sensing. Accordingly, it is important… (more)

▼ The capacity of glass optical fibres to handle stress experienced in sensing application is critical in many areas including biomedical sensing. Accordingly, it is important to determine the tensile strength of optical fibre, providing better understanding of optical fibre strength and the behaviour of optical fibre under certain stresses. This thesis covers the mechanical and optical characterisation of a range of solid glass optical fibres, including solid fibres made of various glass materials, stored lead silicate solid fibre and microstructured optical fibre made of silica glass material. This thesis employs standard mechanical testing techniques such as tensile testing. Data collected from the tensile strength tests is used to understand the statistical behaviour of solid fibres and characterise them mechanically using the statistical Weibull distribution technique. In addition, the strength of numerous solid glass optical fibres made of different glass materials are compared. Firstly, data indicates that depending on the glass material, the strength of the fibre under tensile load varies from very high strength for standard telecommunication fibre, such as solid SMF28, to very low strength for ZBLAN fluoride glass fibres. Secondly, using the same statistical technique for data analysis, an investigation of the effect of aging (storage time) in F2 solid glass fibre was carried out. Results indicate that the aging effect does not have significant effect on the strength of solid F2 glass fibres. Additionally, an investigation was undertaken into the effect of capillary hole size (inflation ratio) and presence of multiple holes on the strength of microstructured glass optical fibres. Results indicate that the inflation ratio and presence of multiple holes in the fibre affects the strength of the fibre. This thesis presents an investigation of the optical characterisation of solid and hollow core optical fibres. Raman spectroscopy of the glass materials was also conducted to explore their potential application in biomedical sensing. Advisors/Committee Members: Ebendorff-Heidepriem, Heike (advisor), Schartner, Erik (advisor), Tsiminis, Georgios (advisor), School of Physical Sciences (school).

Subjects/Keywords: Mechanical; optical; glass optical fibre

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APA (6^th Edition):

Bekteshi, M. R. (2019). [EMBARGOED] Mechanical and optical characterisation of glass optical fibres for sensing applications. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/121351

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

Chicago Manual of Style (16^th Edition):

Bekteshi, Mustaf Raif. “[EMBARGOED] Mechanical and optical characterisation of glass optical fibres for sensing applications.” 2019. Thesis, University of Adelaide. Accessed February 26, 2020. http://hdl.handle.net/2440/121351.

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

MLA Handbook (7^th Edition):

Bekteshi, Mustaf Raif. “[EMBARGOED] Mechanical and optical characterisation of glass optical fibres for sensing applications.” 2019. Web. 26 Feb 2020.

Vancouver:

Bekteshi MR. [EMBARGOED] Mechanical and optical characterisation of glass optical fibres for sensing applications. [Internet] [Thesis]. University of Adelaide; 2019. [cited 2020 Feb 26]. Available from: http://hdl.handle.net/2440/121351.

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

Council of Science Editors:

Bekteshi MR. [EMBARGOED] Mechanical and optical characterisation of glass optical fibres for sensing applications. [Thesis]. University of Adelaide; 2019. Available from: http://hdl.handle.net/2440/121351

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

Rutgers University

13. Gatdula, Robert Diaz, 1990-. Mitigation of loss, crosstalk, and resonance-shift for scalable silicon photonic integrated circuits.

Degree: PhD, Electrical and Computer Engineering, 2019, Rutgers University

URL: https://rucore.libraries.rutgers.edu/rutgers-lib/61747/

►

Integrated optical interconnect technology has reached a point in which academia and industry research are dedicating many of its resources to maturing the technology and… (more)

▼

Integrated optical interconnect technology has reached a point in which academia and industry research are dedicating many of its resources to maturing the technology and developing it for large scalability. Silicon photonics and silicon photonic-related technologies are the main contenders in driving scalability due to silicon’s advantage in being a successful mature material in other large-scale developments such as in achieving highly dense transistors. Silicon’s past success has jumpstarted silicon photonics. However, there are still many hurdles to scaling up. One of the biggest issues with silicon waveguides is that they can be quite lossy. Despite fabrication processes becoming more advanced, the losses of single-mode silicon waveguides are still several orders worse than that in silica-based optical fibers. Typically, to reach lower losses, designers can widen or thicken silicon waveguides. However, there are various multimode-related caveats that can make this non-trivial. As such, we explore waveguide losses with a multimode perspective and provide some insight to avoid intermodal waveguide scattering that might inadvertently increase loss rather than decrease it in wider waveguides. Another issue with waveguides is the need to bend them back and forth when routing light to various parts of a photonic integrated circuit. Dense waveguides have been proven to demonstrate low crosstalk in straight sections by creatively engineering the relative width geometry between neighboring waveguides in the form of a waveguide superlattice. However, the bending of waveguide superlattices introduces bending-related physics that can increase the crosstalk. We explore the bending regime and demonstrate dense waveguide superlattice bends of small footprint and relative crosstalk no greater than -19.6 dB for a waveguide superlattice with a minimum bending radius of 5 µm. We also explore the sensitivities of microring-based transceiver circuits, which can drastically be reduced in performance by fabrication deviations. Furthermore, with ambient conditions such as temperature constantly changing, the performance of microrings can be unstable. More than likely, photonic integrated circuits will be packaged in systems including electronic circuits that can tune the performance of their photonic counterparts. Thus, we provide various gradient-based algorithms to enable automated tuning and thermal adaptivity for multi-microring photonic integrated circuits.

Advisors/Committee Members: Jiang, Wei (chair), Lu, Yicheng (internal member), Caggiano, Michael (internal member), Gajic, Zoran (internal member), Lu, Ming (outside member), School of Graduate Studies.

Subjects/Keywords: Optics; Optical interconnects; Optical losses

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APA (6^th Edition):

Gatdula, Robert Diaz, 1. (2019). Mitigation of loss, crosstalk, and resonance-shift for scalable silicon photonic integrated circuits. (Doctoral Dissertation). Rutgers University. Retrieved from https://rucore.libraries.rutgers.edu/rutgers-lib/61747/

Chicago Manual of Style (16^th Edition):

Gatdula, Robert Diaz, 1990-. “Mitigation of loss, crosstalk, and resonance-shift for scalable silicon photonic integrated circuits.” 2019. Doctoral Dissertation, Rutgers University. Accessed February 26, 2020. https://rucore.libraries.rutgers.edu/rutgers-lib/61747/.

MLA Handbook (7^th Edition):

Gatdula, Robert Diaz, 1990-. “Mitigation of loss, crosstalk, and resonance-shift for scalable silicon photonic integrated circuits.” 2019. Web. 26 Feb 2020.

Vancouver:

Gatdula, Robert Diaz 1. Mitigation of loss, crosstalk, and resonance-shift for scalable silicon photonic integrated circuits. [Internet] [Doctoral dissertation]. Rutgers University; 2019. [cited 2020 Feb 26]. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/61747/.

Council of Science Editors:

Gatdula, Robert Diaz 1. Mitigation of loss, crosstalk, and resonance-shift for scalable silicon photonic integrated circuits. [Doctoral Dissertation]. Rutgers University; 2019. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/61747/

University of Arizona

14. Redman, Brian. Novel Hybrid Analysis Techniques for Complex Optical Systems .

Degree: 2019, University of Arizona

URL: http://hdl.handle.net/10150/636578

► Non-traditional designs are being created to meet an increasing need for cheaper, smaller, more accurate, and more robust optical systems. Standard modeling approaches and quality… (more)

▼ Non-traditional designs are being created to meet an increasing need for cheaper, smaller, more accurate, and more robust optical systems. Standard modeling approaches and quality metrics do not sufficiently describe these novel designs because the systems break standard assumptions and often require task specific metrics. New modeling and measurement techniques are required to determine the limitations and to improve performance. Many traditional optical modeling approaches simplify the analysis of optical systems by make assumptions. Complex optical systems require modeling methods that are more intensive which limits the development of non-traditional optical systems. Measurement and simulation frameworks that break up the optical systems into smaller components can relax the assumption of the simplified optical approaches without requiring the complexity of more complete approaches. This dissertation presents simulations and experimental measurements that leverage traditional optical design tools in conjunction with custom analysis methods to quantify the performance of non-traditional optical systems. The simulation methods and experimental measurements are demonstrated with four unique optical systems. Fourier processing and Mie theory were used to experimentally connect long-wave infrared image degradation to the properties of fog. Simulations of a snapshot channeled imaging polarimeter derived a fundamental limit for the extinction ratio of polarimeters that encode polarization information into spatially modulated irradiance patterns. Ray tracing and custom processing to combine wavefronts was used to simulate the interferogram of a snapshot Fourier transform spectrometer with spatially and spectral incoherent input. The workflow to designs and simulate a monolithic compressive classification system enabled the automated creation of a task-specific optical design. Advisors/Committee Members: Schwiegerling, James (advisor), Milster, Thomas (committeemember), LaCasse, Charles (committeemember).

Subjects/Keywords: interference; Optical design; optical simulations

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APA (6^th Edition):

Redman, B. (2019). Novel Hybrid Analysis Techniques for Complex Optical Systems . (Doctoral Dissertation). University of Arizona. Retrieved from http://hdl.handle.net/10150/636578

Chicago Manual of Style (16^th Edition):

Redman, Brian. “Novel Hybrid Analysis Techniques for Complex Optical Systems .” 2019. Doctoral Dissertation, University of Arizona. Accessed February 26, 2020. http://hdl.handle.net/10150/636578.

MLA Handbook (7^th Edition):

Redman, Brian. “Novel Hybrid Analysis Techniques for Complex Optical Systems .” 2019. Web. 26 Feb 2020.

Vancouver:

Redman B. Novel Hybrid Analysis Techniques for Complex Optical Systems . [Internet] [Doctoral dissertation]. University of Arizona; 2019. [cited 2020 Feb 26]. Available from: http://hdl.handle.net/10150/636578.

Council of Science Editors:

Redman B. Novel Hybrid Analysis Techniques for Complex Optical Systems . [Doctoral Dissertation]. University of Arizona; 2019. Available from: http://hdl.handle.net/10150/636578

University of Georgia

15. Zhang, Zhongyue. Numerical study of the optical properties of silver nanostructures with different topologic shapes.

Degree: PhD, Physics, 2009, University of Georgia

URL: http://purl.galileo.usg.edu/uga_etd/zhang_zhongyue_200905_phd

► The collaborative oscillation of electrons in noble metal nanostructures results in a surface plasmon resonance that makes them useful for various applications including chemical and… (more)

▼ The collaborative oscillation of electrons in noble metal nanostructures results in a surface plasmon resonance that makes them useful for various applications including chemical and biological sensors, plasmonic waveguides, and enhanced spectroscopy. In this dissertation, we study the morphology dependent properties of the surface plasmon resonance, and the discrete dipole approximation method is used to investigate the optical properties of Ag nanostructures with different topologic shapes, such as the cylindrical nanorods, needle-shaped nanorods, period-shaped nanorods, L-shaped nanorods, Y-shaped nanorods, parallel-nanorod structures, U-shaped nanostructures, and the helical nanostructures. For the cylindrical nanorods, the extinction spectra depend on both the aspect ratio (length/diameter) and the diameter. For short nanorods, the longitudinal mode plasmon peaks red shift linearly with aspect ratio. For larger aspect ratios, multipolar plasmon peaks appear in the extinction spectra which also red shift linearly with aspect ratio. Comparing to nanorods with a simple shape (cylinder and needle), irregular nanorods shows many distinct plasmon resonances over a large spectra range. More hot spots are observed for the nanorods with more defects. These results show that defects or imperfections in Ag nanorod structures could drastically change the optical properties, generate extra hot spots for surface enhanced spectroscopy, and have different enhanced field distribution for future plasmonics applications. A U-shaped nanostructure has more hot spots than a parallel-nanorod structure; and at the longitudinal mode incidence, the electric field enhancements are much larger than those of the parallel-nanorod structure. These results could be used to engineer U-shaped nanostructures for specific plasmon applications. Helical nanostructures are another good structure to tune the plasmon peak and arrange the electric field distribution. The plasmon peak and the electric field distribution can be tuned not only by the structural parameters but also by the polarizations of the incident light, especially the circular polarizations. In addition, the origins of the plasmon modes are also investigated. The transverse modes are due to the electron oscillations perpendicular to the cross sections and the longitudinal plasmon peaks are due to the charge oscillations along the arc length of the helix and are mainly determined by the effective dipole length. Advisors/Committee Members: Yiping Zhao.

Subjects/Keywords: optical property

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APA (6^th Edition):

Zhang, Z. (2009). Numerical study of the optical properties of silver nanostructures with different topologic shapes. (Doctoral Dissertation). University of Georgia. Retrieved from http://purl.galileo.usg.edu/uga_etd/zhang_zhongyue_200905_phd

Chicago Manual of Style (16^th Edition):

Zhang, Zhongyue. “Numerical study of the optical properties of silver nanostructures with different topologic shapes.” 2009. Doctoral Dissertation, University of Georgia. Accessed February 26, 2020. http://purl.galileo.usg.edu/uga_etd/zhang_zhongyue_200905_phd.

MLA Handbook (7^th Edition):

Zhang, Zhongyue. “Numerical study of the optical properties of silver nanostructures with different topologic shapes.” 2009. Web. 26 Feb 2020.

Vancouver:

Zhang Z. Numerical study of the optical properties of silver nanostructures with different topologic shapes. [Internet] [Doctoral dissertation]. University of Georgia; 2009. [cited 2020 Feb 26]. Available from: http://purl.galileo.usg.edu/uga_etd/zhang_zhongyue_200905_phd.

Council of Science Editors:

Zhang Z. Numerical study of the optical properties of silver nanostructures with different topologic shapes. [Doctoral Dissertation]. University of Georgia; 2009. Available from: http://purl.galileo.usg.edu/uga_etd/zhang_zhongyue_200905_phd

University of Georgia

16. Dahms, Carol P. Optical blending: a comparison of spectrophotometric measurements and human visual assessments of blended color blocks.

Degree: MS, Textiles, Merchandising and Interiors, 2007, University of Georgia

URL: http://purl.galileo.usg.edu/uga_etd/dahms_carol_p_200708_ms

This study makes comparisons about optical blending by using woven samples, known colors. Samples were prepared and instrumental color measurements were taken on those samples. Human visual assessments of the samples were gathered and compared to the instrumental measurements. Advisors/Committee Members: Helen Epps.

Subjects/Keywords: optical blending

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APA (6^th Edition):

Dahms, C. P. (2007). Optical blending: a comparison of spectrophotometric measurements and human visual assessments of blended color blocks. (Masters Thesis). University of Georgia. Retrieved from http://purl.galileo.usg.edu/uga_etd/dahms_carol_p_200708_ms

Chicago Manual of Style (16^th Edition):

Dahms, Carol P. “Optical blending: a comparison of spectrophotometric measurements and human visual assessments of blended color blocks.” 2007. Masters Thesis, University of Georgia. Accessed February 26, 2020. http://purl.galileo.usg.edu/uga_etd/dahms_carol_p_200708_ms.

MLA Handbook (7^th Edition):

Dahms, Carol P. “Optical blending: a comparison of spectrophotometric measurements and human visual assessments of blended color blocks.” 2007. Web. 26 Feb 2020.

Vancouver:

Dahms CP. Optical blending: a comparison of spectrophotometric measurements and human visual assessments of blended color blocks. [Internet] [Masters thesis]. University of Georgia; 2007. [cited 2020 Feb 26]. Available from: http://purl.galileo.usg.edu/uga_etd/dahms_carol_p_200708_ms.

Council of Science Editors:

Dahms CP. Optical blending: a comparison of spectrophotometric measurements and human visual assessments of blended color blocks. [Masters Thesis]. University of Georgia; 2007. Available from: http://purl.galileo.usg.edu/uga_etd/dahms_carol_p_200708_ms

17. Sun, Deqing. From Pixels to Layers: Joint Motion Estimation and Segmentation.

Degree: PhD, Computer Science, 2013, Brown University

URL: https://repository.library.brown.edu/studio/item/bdr:320469/

► Estimating image motion, or optical flow, in scenes with multiple moving objects and segmenting the individual moving objects are two fundamental problems in computer vision… (more)

▼ Estimating image motion, or optical flow, in scenes with multiple moving objects and segmenting the individual moving objects are two fundamental problems in computer vision and have applications in many fields, including medical imaging, image processing, graphics, and robotics. Despite decades of extensive research effort, current methods still tend to produce large optical flow errors near motion boundaries and in occlusion regions and falsely merge foreground objects with the background. A key feature of optical flow methods is an energy term, or prior, that prefers spatially smooth flow fields. In this dissertation, we show that image-dependent and non-local prior models can better preserve motion boundaries than the widely used pairwise Markov Random Field (MRF) models. We also demonstrate that joint motion estimation and segmentation can achieve more accurate results than the separate treatment of each problem. First, we formulate fully learnable low-level models of optical flow and learn the models from training data. Our results show that image-dependent, steerable models outperform standard MRF models, especially in recovering motion boundaries. Second, we perform a quantitative analysis of recent practices in optical flow estimation. Median filtering of the flow field is one of the key features of the most accurate methods and we formalize this as a non-local smoothness term that integrates information over a large spatial neighborhood. We further define a weighted non-local smoothness term that uses both image and motion cues to preserve motion boundaries. Third, we develop a layered model to segment moving objects (layers) using image-dependent, continuous support functions. The method orders each layer in depth and explicitly models the occlusions between layers and the temporal consistency of layers. To avoid being trapped in poor local optima, we define a discrete formulation of our objective function and extend graph cuts optimization methods to obtain good initial values for the continuous formulation. The mixed continuous-discrete optimizer can automatically infer the number of layers and their depth ordering for a given scene. Experimental results on benchmark datasets demonstrate the benefits of joint motion estimation and segmentation via the layered approach. Advisors/Committee Members: Black, Michael (Director), Sudderth, Erik (Reader), Yair, Weiss (Reader).

Subjects/Keywords: optical flow

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APA (6^th Edition):

Sun, D. (2013). From Pixels to Layers: Joint Motion Estimation and Segmentation. (Doctoral Dissertation). Brown University. Retrieved from https://repository.library.brown.edu/studio/item/bdr:320469/

Chicago Manual of Style (16^th Edition):

Sun, Deqing. “From Pixels to Layers: Joint Motion Estimation and Segmentation.” 2013. Doctoral Dissertation, Brown University. Accessed February 26, 2020. https://repository.library.brown.edu/studio/item/bdr:320469/.

MLA Handbook (7^th Edition):

Sun, Deqing. “From Pixels to Layers: Joint Motion Estimation and Segmentation.” 2013. Web. 26 Feb 2020.

Vancouver:

Sun D. From Pixels to Layers: Joint Motion Estimation and Segmentation. [Internet] [Doctoral dissertation]. Brown University; 2013. [cited 2020 Feb 26]. Available from: https://repository.library.brown.edu/studio/item/bdr:320469/.

Council of Science Editors:

Sun D. From Pixels to Layers: Joint Motion Estimation and Segmentation. [Doctoral Dissertation]. Brown University; 2013. Available from: https://repository.library.brown.edu/studio/item/bdr:320469/

18. Li, Yanqiu. Ultrafast Phenomena on the Nanoscale in Solids: From Magnetic to Acoustic Phenomena.

Degree: PhD, Physics, 2009, Brown University

URL: https://repository.library.brown.edu/studio/item/bdr:178/

► Access to ultrafast physical phenomena through the use of real-time laser spectroscopy is a vibrant field in science and engineering today. Ultrashort laser pulses with… (more)

▼ Access to ultrafast physical phenomena through the use of real-time laser spectroscopy is a vibrant field in science and engineering today. Ultrashort laser pulses with controlled energy of sub-picosecond duration can be used to probe fastest events in atomic, molecular, solid state and biochemical systems. In this thesis, we employed ultrafast lasers for light-matter interaction of selected ultrafast electronic, magnetic and acoustic processes in distinctly different media. One area of interest in this thesis is the dynamics of electron spins in ferromagnetic materials. Previous work in our group successfully demonstrated ultrafast coherent magnetization rotation in the ferromagnetic thin film triggered by ultrafast optical pulses. In this thesis we extended the study of ultrafast spin dynamics to magnetic nanostructures. In another material system, a nanocomposite of ferromagnetic and noble metals, we show how noble metal nanoparticles are capable of greatly enhancing the magneto-optical response of the hybrid nanomaterials when excited at their plasmonic resonance wavelength. We describe the physics that enables the plasmonic resonance behavior of the noble-metal nanoparticles to improve their magnetooptical response. While initially focusing on measurements of the transient magnetooptical effect in the nanocomposites by ultrashort pulse optical techniques, we discovered a strongly competing signature which originated from optically induced acoustic vibration of the nanoparticles. The pronounced acousto-optical transient phenomena led to the study of laser picosecond ultrasonics. In this part of work we address the challenges in the conventional picosecond ultrasonic measurements where the opto-acoustic signals acquired as modulated reflection of the time-delayed probe beams are small due to small piezo-optic coefficients. We have investigated the use of a Fabry-Perot optical cavity to enhance these signals. The cavity is formed between a distributed Bragg reflector and a metal thin film sample. Experimental results for Al and Cu films show enhancement of acoustic signals by up to two orders of magnitude. This technique also makes it possible to determine the actual pulse shape of the returning acoustic echoes inside the metal thin films, thereby enriching the total amount of information acquired in picosecond ultrasonic experiments. Advisors/Committee Members: Nurmikko, Arto (director), Maris, Humphrey (director), Zia, Rashid (reader).

Subjects/Keywords: Optical Cavity

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APA (6^th Edition):

Li, Y. (2009). Ultrafast Phenomena on the Nanoscale in Solids: From Magnetic to Acoustic Phenomena. (Doctoral Dissertation). Brown University. Retrieved from https://repository.library.brown.edu/studio/item/bdr:178/

Chicago Manual of Style (16^th Edition):

Li, Yanqiu. “Ultrafast Phenomena on the Nanoscale in Solids: From Magnetic to Acoustic Phenomena.” 2009. Doctoral Dissertation, Brown University. Accessed February 26, 2020. https://repository.library.brown.edu/studio/item/bdr:178/.

MLA Handbook (7^th Edition):

Li, Yanqiu. “Ultrafast Phenomena on the Nanoscale in Solids: From Magnetic to Acoustic Phenomena.” 2009. Web. 26 Feb 2020.

Vancouver:

Li Y. Ultrafast Phenomena on the Nanoscale in Solids: From Magnetic to Acoustic Phenomena. [Internet] [Doctoral dissertation]. Brown University; 2009. [cited 2020 Feb 26]. Available from: https://repository.library.brown.edu/studio/item/bdr:178/.

Council of Science Editors:

Li Y. Ultrafast Phenomena on the Nanoscale in Solids: From Magnetic to Acoustic Phenomena. [Doctoral Dissertation]. Brown University; 2009. Available from: https://repository.library.brown.edu/studio/item/bdr:178/

19. Biris, Octavian. Compression of 2-d and 3-d Dynamic Scenes.

Degree: PhD, Electrical Sciences and Computer Engineering, 2015, Brown University

URL: https://repository.library.brown.edu/studio/item/bdr:419458/

► This thesis is dedicated to exploring compression methods for large dynamic scenes. The first part presents a case study of compressing aerial video using background… (more)

Subjects/Keywords: Optical Flow

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APA (6^th Edition):

Biris, O. (2015). Compression of 2-d and 3-d Dynamic Scenes. (Doctoral Dissertation). Brown University. Retrieved from https://repository.library.brown.edu/studio/item/bdr:419458/

Chicago Manual of Style (16^th Edition):

Biris, Octavian. “Compression of 2-d and 3-d Dynamic Scenes.” 2015. Doctoral Dissertation, Brown University. Accessed February 26, 2020. https://repository.library.brown.edu/studio/item/bdr:419458/.

MLA Handbook (7^th Edition):

Biris, Octavian. “Compression of 2-d and 3-d Dynamic Scenes.” 2015. Web. 26 Feb 2020.

Vancouver:

Biris O. Compression of 2-d and 3-d Dynamic Scenes. [Internet] [Doctoral dissertation]. Brown University; 2015. [cited 2020 Feb 26]. Available from: https://repository.library.brown.edu/studio/item/bdr:419458/.

Council of Science Editors:

Biris O. Compression of 2-d and 3-d Dynamic Scenes. [Doctoral Dissertation]. Brown University; 2015. Available from: https://repository.library.brown.edu/studio/item/bdr:419458/

20. Boutin, Molly E. Advancing in vivo-relevant neural platforms using optical clearing techniques and self-assembled microtissues.

Degree: PhD, Biomedical Engineering, 2016, Brown University

URL: https://repository.library.brown.edu/studio/item/bdr:674284/

► The central nervous system (CNS) contains a complex assortment of cell types and extracellular matrix proteins, which are arranged into an intricate architecture and ultimately… (more)

▼ The central nervous system (CNS) contains a complex assortment of cell types and extracellular matrix proteins, which are arranged into an intricate architecture and ultimately cooperate to generate brain function. Many aspects of neural development and pathology remain elusive, hindering the complete understanding of neurodevelopmental processes and the development of therapeutics. Increased understanding of CNS tissues can be gained by studying neural cells in vitro. In this thesis we aimed to create in vitro models which approximate important characteristics of in vivo neural tissue, including tissue stiffness, cell density, cell composition complexity, and three-dimensional (3D) cell growth. These characteristics are known to influence cell behavior, and are challenging to study in traditional two-dimensional culture models. Using cellular self-assembly, we created 3D scaffold-free spheroid microtissues from primary postnatal rat cortical cells. Due to the high cellular density and optical opacity of 3D spheroids, traditional confocal imaging protocols do not allow for visualization of structures in spheroid centers. Through the application of traditional neuroscience optical clearing protocols to neural microtissues, we increase imaging depth abilities from ~20 µm to ~100 µm. Improvements in imaging abilities allowed for further characterization of cortical spheroids, including the identification of specific cell types, such as neurons, glial subtypes, neural progenitor cells, and endothelial cells. Additionally, through single cell patch-clamping and atomic force microscopy, we characterized and demonstrated the in vivo-relevance of neuronal electrophysiology and tissue stiffness, respectively. Following these general characterization studies, we focused on the specific phenomena of neural vasculature growth. These studies were motivated by the importance of vasculature in healthy neural tissue, and the lack of understanding of vascular pathologies associated with many neurological diseases. We observed the formation of endothelial cell capillary-like networks within cortical spheroids, and characterized the presence of extracellular matrix basement membrane proteins, endothelial cell lumens, and interactions with relevant resident cell types. Overall, the studies of this thesis advance in vivo-relevant 3D neural microtissue models, by improving imaging techniques and providing characterizations of cell types and relevant tissue properties. Advisors/Committee Members: Hoffman-Kim, Diane (Director), Morgan, Jeffrey (Reader), Morrow, Eric (Reader), Franck, Christian (Reader), Vaccarino, Flora (Reader).

Subjects/Keywords: optical clearing

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APA (6^th Edition):

Boutin, M. E. (2016). Advancing in vivo-relevant neural platforms using optical clearing techniques and self-assembled microtissues. (Doctoral Dissertation). Brown University. Retrieved from https://repository.library.brown.edu/studio/item/bdr:674284/

Chicago Manual of Style (16^th Edition):

Boutin, Molly E. “Advancing in vivo-relevant neural platforms using optical clearing techniques and self-assembled microtissues.” 2016. Doctoral Dissertation, Brown University. Accessed February 26, 2020. https://repository.library.brown.edu/studio/item/bdr:674284/.

MLA Handbook (7^th Edition):

Boutin, Molly E. “Advancing in vivo-relevant neural platforms using optical clearing techniques and self-assembled microtissues.” 2016. Web. 26 Feb 2020.

Vancouver:

Boutin ME. Advancing in vivo-relevant neural platforms using optical clearing techniques and self-assembled microtissues. [Internet] [Doctoral dissertation]. Brown University; 2016. [cited 2020 Feb 26]. Available from: https://repository.library.brown.edu/studio/item/bdr:674284/.

Council of Science Editors:

Boutin ME. Advancing in vivo-relevant neural platforms using optical clearing techniques and self-assembled microtissues. [Doctoral Dissertation]. Brown University; 2016. Available from: https://repository.library.brown.edu/studio/item/bdr:674284/

Brock University

21. Madubuonu, Anthony. Far infrared optical properties of V and Cr doped Sb2Te3 .

Degree: Department of Physics, 2009, Brock University

URL: http://hdl.handle.net/10464/1591

► The far infrared reflectance of Sb2Te3 , Sbi.97Vo.o3Te3 and Sbi.94Cr .o6Te3 was measured near normal incidence at different temperatures (between 45K and 300K). The direct… (more)

Subjects/Keywords: Optical properties

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APA (6^th Edition):

Madubuonu, A. (2009). Far infrared optical properties of V and Cr doped Sb2Te3 . (Thesis). Brock University. Retrieved from http://hdl.handle.net/10464/1591

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

Chicago Manual of Style (16^th Edition):

Madubuonu, Anthony. “Far infrared optical properties of V and Cr doped Sb2Te3 .” 2009. Thesis, Brock University. Accessed February 26, 2020. http://hdl.handle.net/10464/1591.

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

MLA Handbook (7^th Edition):

Madubuonu, Anthony. “Far infrared optical properties of V and Cr doped Sb2Te3 .” 2009. Web. 26 Feb 2020.

Vancouver:

Madubuonu A. Far infrared optical properties of V and Cr doped Sb2Te3 . [Internet] [Thesis]. Brock University; 2009. [cited 2020 Feb 26]. Available from: http://hdl.handle.net/10464/1591.

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

Council of Science Editors:

Madubuonu A. Far infrared optical properties of V and Cr doped Sb2Te3 . [Thesis]. Brock University; 2009. Available from: http://hdl.handle.net/10464/1591

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

Universitat de Valencia

22. Doblas Expósito, Ana Isabel. New advances in high-resolution optical microscopy .

Degree: 2015, Universitat de Valencia

URL: http://hdl.handle.net/10550/47190

► La microscopio ía tiene como nalidad observar muestras que no pueden distinguirse a simple vista por el ojo humano dado que el tamaño de ellas… (more)

Subjects/Keywords: optical microscopy

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APA (6^th Edition):

Doblas Expósito, A. I. (2015). New advances in high-resolution optical microscopy . (Doctoral Dissertation). Universitat de Valencia. Retrieved from http://hdl.handle.net/10550/47190

Chicago Manual of Style (16^th Edition):

Doblas Expósito, Ana Isabel. “New advances in high-resolution optical microscopy .” 2015. Doctoral Dissertation, Universitat de Valencia. Accessed February 26, 2020. http://hdl.handle.net/10550/47190.

MLA Handbook (7^th Edition):

Doblas Expósito, Ana Isabel. “New advances in high-resolution optical microscopy .” 2015. Web. 26 Feb 2020.

Vancouver:

Doblas Expósito AI. New advances in high-resolution optical microscopy . [Internet] [Doctoral dissertation]. Universitat de Valencia; 2015. [cited 2020 Feb 26]. Available from: http://hdl.handle.net/10550/47190.

Council of Science Editors:

Doblas Expósito AI. New advances in high-resolution optical microscopy . [Doctoral Dissertation]. Universitat de Valencia; 2015. Available from: http://hdl.handle.net/10550/47190

University of Arizona

23. Smith, Paula Kay. Characterizing Dielectric Tensors of Anisotropic Materials From a Single Measurement .

Degree: 2013, University of Arizona

URL: http://hdl.handle.net/10150/293464

► Ellipsometry techniques look at changes in polarization states to measure optical properties of thin film materials. A beam reflected from a substrate measures the real… (more)

▼ Ellipsometry techniques look at changes in polarization states to measure optical properties of thin film materials. A beam reflected from a substrate measures the real and imaginary parts of the index of the material represented as n and k, respectively. Measuring the substrate at several angles gives additional information that can be used to measure multilayer thin film stacks. However, the outstanding problem in standard ellipsometry is that it uses a limited number of incident polarization states (s and p). This limits the technique to isotropic materials. The technique discussed in this paper extends the standard process to measure anisotropic materials by using a larger set of incident polarization states. By using a polarimeter to generate several incident polarization states and measure the polarization properties of the sample, ellipsometry can be performed on biaxial materials.Use of an optimization algorithm in conjunction with biaxial ellipsometry can more accurately determine the dielectric tensor of individual layers in multilayer structures. Biaxial ellipsometry is a technique that measures the dielectric tensors of a biaxial substrate, single-layer thin film, or multi-layer structure. The dielectric tensor of a biaxial material consists of the real and imaginary parts of the three orthogonal principal indices (nₓ + ikₓ, n(y) +ik(y) and n(z) + ik(z)) as well as three Euler angles (α, β, and γ) to describe its orientation. The method utilized in this work measures an angle-of-incidence Mueller matrix from a Mueller matrix imaging polarimeter equipped with a pair of microscope objectives that have low polarization properties. To accurately determine the dielectric tensors for multilayer samples, the angle-of-incidence Mueller matrix images are collected for multiple wavelengths. This is done in either a transmission mode or a reflection mode, each incorporates an appropriate dispersion model. Given approximate a priori knowledge of the dielectric tensor and film thickness, a Jones reflectivity matrix is calculated by solving Maxwell's equations at each surface. Converting the Jones matrix into a Mueller matrix provides a starting point for optimization. An optimization algorithm then finds the best fit dielectric tensor based on the measured angle-of-incidence Mueller matrix image. This process can be applied to polarizing materials, birefringent crystals and the multilayer structures of liquid crystal displays. In particular, the need for such accuracy in liquid crystal displays is growing as their applications in industry evolve. Advisors/Committee Members: Chipman, Russell (advisor), Dereniak, Eustace (committeemember), Falco, Charles (committeemember), Chipman, Russell (committeemember).

Subjects/Keywords: Optical Sciences

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APA (6^th Edition):

Smith, P. K. (2013). Characterizing Dielectric Tensors of Anisotropic Materials From a Single Measurement . (Doctoral Dissertation). University of Arizona. Retrieved from http://hdl.handle.net/10150/293464

Chicago Manual of Style (16^th Edition):

Smith, Paula Kay. “Characterizing Dielectric Tensors of Anisotropic Materials From a Single Measurement .” 2013. Doctoral Dissertation, University of Arizona. Accessed February 26, 2020. http://hdl.handle.net/10150/293464.

MLA Handbook (7^th Edition):

Smith, Paula Kay. “Characterizing Dielectric Tensors of Anisotropic Materials From a Single Measurement .” 2013. Web. 26 Feb 2020.

Vancouver:

Smith PK. Characterizing Dielectric Tensors of Anisotropic Materials From a Single Measurement . [Internet] [Doctoral dissertation]. University of Arizona; 2013. [cited 2020 Feb 26]. Available from: http://hdl.handle.net/10150/293464.

Council of Science Editors:

Smith PK. Characterizing Dielectric Tensors of Anisotropic Materials From a Single Measurement . [Doctoral Dissertation]. University of Arizona; 2013. Available from: http://hdl.handle.net/10150/293464

University of Arizona

24. Lau, Pick Chung. Novel Applications of Semiconductor Nanocrystals .

Degree: 2013, University of Arizona

URL: http://hdl.handle.net/10150/297024

► We have investigated ways of modifying a common water soluble CdTe NCs to become non-photobleaching. Such NCs are capable of responding reversibly to an inter-switching… (more)

▼ We have investigated ways of modifying a common water soluble CdTe NCs to become non-photobleaching. Such NCs are capable of responding reversibly to an inter-switching of the oxygen and argon environments over multiple hours of photoexcitation. They are found to quench upon exposure to oxygen, but when the system is purged with argon, their photoluminescence (PL) revives to the original intensity. Such discovery could potentially be used as oxygen nanosensors. These PL robust CdTe NCs immobilized on glass substrates also exhibit significant changes in their PL when certain organic/bio molecules are placed in their vicinity (nanoscale). This novel technique also known as NC-organic molecule close proximity imaging (NC-cp imaging) has found to provide contrast ratio greater by a factor of 2-3 compared to conventional fluorescence imaging technique. PL of NCs is recoverable upon removal of these organic molecules, therefore validating these NCs as potential all-optical organic molecular nanosensors and, upon optimization, ultimately serving as point detectors for purposes of super-resolution microscopy (with proper instrumentation). No solvents are required for this sensing mechanism since all solutions were dried under argon flow. Furthermore, core graded shell CdSe/CdSeₓS(1-x)/CdS giant nanocrystal (g-NCs) were found to have very robust PL temperature response. At a size of 10.2 nm in diameter, these g-NCs undergo PL drop of only 30% at 355K (normalized to PL intensity at 85K). In comparison, the core step shells CdSe/CdS g-NCs at the same diameter exhibit 80% PL drop at 355K. Spectral shifting and broadening were acquired and found to be 5-10 times and 2-4 times smaller respectively than the standard CdSe core and CdSe/CdS core shell NCs. It is also discovered that these core graded shell g-NCs are largely nonblinking and have insignificant photoluminescence decay even after exciting the samples at very high irradiance (44 kW/cm²) for over an hour. These types of g-NCs have great potential to be used as the active medium for temperature insensitive laser devices in the visible range or temperature insensitive bioprobes for bioimaging applications. Advisors/Committee Members: Mansuripur, Masud (advisor), Norwood, Robert A. (committeemember), Peng, Leilei (committeemember), Mansuripur, Masud (committeemember).

Subjects/Keywords: Optical Sciences

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APA (6^th Edition):

Lau, P. C. (2013). Novel Applications of Semiconductor Nanocrystals . (Doctoral Dissertation). University of Arizona. Retrieved from http://hdl.handle.net/10150/297024

Chicago Manual of Style (16^th Edition):

Lau, Pick Chung. “Novel Applications of Semiconductor Nanocrystals .” 2013. Doctoral Dissertation, University of Arizona. Accessed February 26, 2020. http://hdl.handle.net/10150/297024.

MLA Handbook (7^th Edition):

Lau, Pick Chung. “Novel Applications of Semiconductor Nanocrystals .” 2013. Web. 26 Feb 2020.

Vancouver:

Lau PC. Novel Applications of Semiconductor Nanocrystals . [Internet] [Doctoral dissertation]. University of Arizona; 2013. [cited 2020 Feb 26]. Available from: http://hdl.handle.net/10150/297024.

Council of Science Editors:

Lau PC. Novel Applications of Semiconductor Nanocrystals . [Doctoral Dissertation]. University of Arizona; 2013. Available from: http://hdl.handle.net/10150/297024

University of Arizona

25. Demir, Veysi. Nanocomposites for High-Speed Optical Modulators and Plasmonic Thermal Mid-Infrared Emitters .

Degree: 2015, University of Arizona

URL: http://hdl.handle.net/10150/581130

► Demand for high-speed optical modulators and narrow-bandwidth infrared thermal emitters for numerous applications continues to rise and new optical devices are needed to deal with… (more)

▼ Demand for high-speed optical modulators and narrow-bandwidth infrared thermal emitters for numerous applications continues to rise and new optical devices are needed to deal with massive data flows, processing powers, and fabrication costs. Conventional techniques are usually hindered by material limitations or electronic interconnects and advances in organic nanocomposite materials and their integration into photonic integrated circuits (PICs) have been acknowledged as a promising alternative to single crystal techniques. The work presented in this thesis uses plasmonic and magneto-optic effects towards the development of novel optical devices for harnessing light and generating high bandwidth signals (> 40GHz) at room and cryogenic temperatures (4.2°K). Several publications have resulted from these efforts and are listed at the end of the abstract. In our first published research we developed a narrow-bandwidth mid-infrared thermal emitter using an Ag/dielectric/Ag thin film structure arranged in hexagonal planar lattice structures. PECVD produced nanoamorphous carbon (NAC) is used as a dielectric layer. Spectrally tunable (>2 μm) and narrow bandwidth (<0.5 μm) emission peaks in the range of 4-7μm were demonstrated by decreasing the resistivity of NAC from 10¹² and 10⁹ Ω.cm with an MoSi₂ dopant and increasing the emitter lattice constant from 4 to 7 μm. This technique offers excellent flexibility for developing cost-effective mid-IR sources as compared to costly fiber and quantum cascade lasers (QCLs). Next, the effect of temperature on the Verdet constant for cobalt-ferrite polymer nanocomposites was measured for a series of temperatures ranging from 40 to 200°K with a Faraday rotation polarimeter. No visual change was observed in the films during thermal cycling, and ~4x improvement was achieved at 40°K. The results are promising and further analysis is merited at 4.2°K to assess the performance of this material for cryogenic magneto-optic modulators for supercomputers. Finally, the dielectric constant and loss tangent of MAPTMS sol-gel films were measured over a wide range of microwave frequencies. The test structures were prepared by spin-coating sol-gel films onto metallized glass substrates. The dielectric properties of the sol-gel were probed with several different sets of coplanar waveguides (CPWs) electroplated onto sol-gel films. The dielectric constant and loss-tangent of these films were determined to be ~3.1 and 3 x 10⁻³ at 35GHz. These results are very promising indicating that sol-gels are viable cladding materials for high-speed electro-optic polymer modulators (>40GHz). Advisors/Committee Members: Peyghambarian, Nasser (advisor), Peyghambarian, Nasser (committeemember), Norwood, Robert A. (committeemember), Pau, Stanley (committeemember).

Subjects/Keywords: Optical Sciences

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APA (6^th Edition):

Demir, V. (2015). Nanocomposites for High-Speed Optical Modulators and Plasmonic Thermal Mid-Infrared Emitters . (Doctoral Dissertation). University of Arizona. Retrieved from http://hdl.handle.net/10150/581130

Chicago Manual of Style (16^th Edition):

Demir, Veysi. “Nanocomposites for High-Speed Optical Modulators and Plasmonic Thermal Mid-Infrared Emitters .” 2015. Doctoral Dissertation, University of Arizona. Accessed February 26, 2020. http://hdl.handle.net/10150/581130.

MLA Handbook (7^th Edition):

Demir, Veysi. “Nanocomposites for High-Speed Optical Modulators and Plasmonic Thermal Mid-Infrared Emitters .” 2015. Web. 26 Feb 2020.

Vancouver:

Demir V. Nanocomposites for High-Speed Optical Modulators and Plasmonic Thermal Mid-Infrared Emitters . [Internet] [Doctoral dissertation]. University of Arizona; 2015. [cited 2020 Feb 26]. Available from: http://hdl.handle.net/10150/581130.

Council of Science Editors:

Demir V. Nanocomposites for High-Speed Optical Modulators and Plasmonic Thermal Mid-Infrared Emitters . [Doctoral Dissertation]. University of Arizona; 2015. Available from: http://hdl.handle.net/10150/581130

University of Arizona

26. Sullivan, John Joseph. Non-Null Interferometer for Testing of Aspheric Surfaces .

Degree: 2015, University of Arizona

URL: http://hdl.handle.net/10150/594367

► The use of aspheric surfaces in optical designs can allow for improved performance with fewer optical elements. Their use has become common place due to… (more)

▼ The use of aspheric surfaces in optical designs can allow for improved performance with fewer optical elements. Their use has become common place due to advancements in optical manufacturing technologies. Standard interferometric testing of aspheric surfaces makes use of part specific null optics in order to match the test wavefront to the aspheric surface under test. Non-null interferometric testing offers the possibility to test a range of aspheric surfaces with a single interferometer design without the need for part specific null optics. However, non-null tests can generate interferograms with very high fringe frequencies that must be resolved and unwrapped, wavefronts with large slopes that must be imaged without vignetting, and induced aberrations which must be separated from the surface errors of the part. The main goal of this project was the construction of a non-null interferometer capable of testing the aspheric tooling used in the manufacturing of soft contact lenses. Sub-Nyquist interferometry was used to allow for large wavefront departures which generate high fringe frequency interferograms to be both captured and unwrapped. The sparse array sensor at the heart of the Sub-Nyquist technique sets limits on both the range of the parts to be tested and the design of the interferometer. Characterization of the interferometer was achieved through the reverse optimization and reverse ray tracing of a model of the interferometer and was aided by multiple measurements of the test part at shifted positions. The system was found to be capable of measuring parts with aspheric departure of over 60λ from the best fit sphere, which with introduced part shifts, generated over 300λ of OPD at the detector. The OPD introduced by the parts was measured to an accuracy of at least 0.76λ peak to valley and 0.12λ rms. Advisors/Committee Members: Greivenkamp, John E (advisor), Greivenkamp, John E. (committeemember), Sasián, José (committeemember), Wyant, James C. (committeemember).

Subjects/Keywords: Optical Sciences

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APA (6^th Edition):

Sullivan, J. J. (2015). Non-Null Interferometer for Testing of Aspheric Surfaces . (Doctoral Dissertation). University of Arizona. Retrieved from http://hdl.handle.net/10150/594367

Chicago Manual of Style (16^th Edition):

Sullivan, John Joseph. “Non-Null Interferometer for Testing of Aspheric Surfaces .” 2015. Doctoral Dissertation, University of Arizona. Accessed February 26, 2020. http://hdl.handle.net/10150/594367.

MLA Handbook (7^th Edition):

Sullivan, John Joseph. “Non-Null Interferometer for Testing of Aspheric Surfaces .” 2015. Web. 26 Feb 2020.

Vancouver:

Sullivan JJ. Non-Null Interferometer for Testing of Aspheric Surfaces . [Internet] [Doctoral dissertation]. University of Arizona; 2015. [cited 2020 Feb 26]. Available from: http://hdl.handle.net/10150/594367.

Council of Science Editors:

Sullivan JJ. Non-Null Interferometer for Testing of Aspheric Surfaces . [Doctoral Dissertation]. University of Arizona; 2015. Available from: http://hdl.handle.net/10150/594367

27. Chaix, Cécile. AdaptiSPECT: a Preclinical Imaging System .

Degree: 2015, University of Arizona

URL: http://hdl.handle.net/10150/594908

► This dissertation addresses the design, development, calibration and performance evaluation of a pre-clinical imaging system called AdaptiSPECT. Single-Photon Emission Computed Tomography (SPECT) systems are powerful… (more)

▼ This dissertation addresses the design, development, calibration and performance evaluation of a pre-clinical imaging system called AdaptiSPECT. Single-Photon Emission Computed Tomography (SPECT) systems are powerful tools for multiple applications in small-animal research, ranging from drug discovery to fundamental biology. Traditionally, pinhole SPECT systems are designed with fixed imaging characteristics in terms of sensitivity, resolution and size of the field of view, that are dictated by the hardware configuration of the system. The SPECT system described in this dissertation can change its hardware configuration in response to the subject data it is acquiring in order to improve the imaging performance. We employed 16 modular gamma-ray detectors, each of which consists of a NaI:Tl scintillation crystal, a fused silica lightguide, and an array of 9 PMTs. The camera is designed to work with maximum-likelihood position estimation methods. These detectors are arranged into 2 rings of 8 detectors around an adjustable pinhole aperture. The aperture itself comprises three cylinders of different diameters, each with pinholes of different diameters. The three aperture cylinders are stacked together along the imager axis, and selection of the appropriate ring of pinholes is carried out by translating the entire aperture assembly. In addition, some sections of the aperture are fitted with shutters to open or close additional pinholes that increase sensitivity. We reviewed the method used to calibrate AdaptiSPECT, and proposed a new interpolation scheme specific to adaptive SPECT imaging systems where the detectors can move to multiple locations, that yields system matrices for any configuration employed during adaptive imaging. We evaluated the performances of AdaptiSPECT for various configurations. The magnification of the system ranges from 1.2 to 11.1. The corresponding resolution ranges from 3.2 mm to 0.6 mm, and the corresponding transaxial field-of-view ranges from 84 mm to 10 mm. The sensitivity of the system varies from 220 cps/MBq to 340 cps/MBq for various configurations. Imaging of a mouse injected with a bone radiotracer revealed the finer structures that can be acquired at higher magnifications, and illustrated the ability to conveniently image with a variety of magnifications during the same study. In summary, we have brought the concept of an adaptive SPECT imaging system as it was originally described by Barrett et al. in 2008 to life. We have engineered a system that can switch configurations with speed, precision, and repeatability suitable to carry out adaptive imaging studies on small animals, thus opening the door to a new research and medical imaging paradigm in which the imager hardware is adjusted on the fly to maximize task-performance for a specific patient, not, as currently, an ensemble of patients. Advisors/Committee Members: Furenlid, Lars R (advisor), Furenlid, Lars R. (committeemember), Barrett, Harrison H. (committeemember), Gmitro, Arthur F. (committeemember), Kupinski, Matthew A. (committeemember).

Subjects/Keywords: Optical Sciences

11 more images…

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APA (6^th Edition):

Chaix, C. (2015). AdaptiSPECT: a Preclinical Imaging System . (Doctoral Dissertation). University of Arizona. Retrieved from http://hdl.handle.net/10150/594908

Chicago Manual of Style (16^th Edition):

Chaix, Cécile. “AdaptiSPECT: a Preclinical Imaging System .” 2015. Doctoral Dissertation, University of Arizona. Accessed February 26, 2020. http://hdl.handle.net/10150/594908.

MLA Handbook (7^th Edition):

Chaix, Cécile. “AdaptiSPECT: a Preclinical Imaging System .” 2015. Web. 26 Feb 2020.

Vancouver:

Chaix C. AdaptiSPECT: a Preclinical Imaging System . [Internet] [Doctoral dissertation]. University of Arizona; 2015. [cited 2020 Feb 26]. Available from: http://hdl.handle.net/10150/594908.

Council of Science Editors:

Chaix C. AdaptiSPECT: a Preclinical Imaging System . [Doctoral Dissertation]. University of Arizona; 2015. Available from: http://hdl.handle.net/10150/594908

University of Arizona

28. Carlson, David R. Frequency Combs for Spectroscopy in the Vacuum Ultraviolet .

Degree: 2016, University of Arizona

URL: http://hdl.handle.net/10150/612874

► This dissertation explores frequency comb spectroscopy and, in particular, its extension to the vacuum-ultraviolet (VUV) and extreme-ultraviolet (XUV) wavelength regimes through a technique called intracavity… (more)

▼ This dissertation explores frequency comb spectroscopy and, in particular, its extension to the vacuum-ultraviolet (VUV) and extreme-ultraviolet (XUV) wavelength regimes through a technique called intracavity high harmonic generation (IHHG). By combining the techniques of passive pulse amplification in an enhancement cavity with high harmonic generation, IHHG enables the direct conversion of near-infrared radiation to the VUV/XUV while still maintaining the underlying comb structure .As part of this work, a series of numerical simulations was performed to investigate the plasma that is formed in the IHHG process and its implications for the resulting VUV comb. It was demonstrated that a fundamental limitation to the performance of IHHG experiments is due to the single-pass ionization phase shift acquired by the pulse circulating in the enhancement cavity. Furthermore, we showed that a static background plasma accumulates between pulses and complicates cavity stabilization. Insights gained from the simulations led to the development of a novel pump-probe technique using the enhancement cavity that allowed a direct measurement of the intracavity plasma and its decay dynamics in real-time. Because the plasma lifetime plays such a crucial role in the operation of these cavities, it was important to have a method to test ways of reducing it. To build on our initial IHHG results showing record-level powers in the XUV, we implemented a fully phase-coherent dual comb spectrometer consisting of two identical IHHG systems operating in parallel. The system is designed for precision spectroscopy in the VUV and is based on a pair of homemade ytterbium fiber lasers that use a parabolic amplification scheme to achieve 80 fs pulses after amplification to 50 W of average power. Initial dual comb data showing system performance at the fundamental frequency and third harmonic are presented. Advisors/Committee Members: Jones, Ronald Jason (advisor), Anderson, Brian P. (committeemember), Wright, Ewan M. (committeemember), Jones, Ronald Jason (committeemember).

Subjects/Keywords: Optical Sciences

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APA (6^th Edition):

Carlson, D. R. (2016). Frequency Combs for Spectroscopy in the Vacuum Ultraviolet . (Doctoral Dissertation). University of Arizona. Retrieved from http://hdl.handle.net/10150/612874

Chicago Manual of Style (16^th Edition):

Carlson, David R. “Frequency Combs for Spectroscopy in the Vacuum Ultraviolet .” 2016. Doctoral Dissertation, University of Arizona. Accessed February 26, 2020. http://hdl.handle.net/10150/612874.

MLA Handbook (7^th Edition):

Carlson, David R. “Frequency Combs for Spectroscopy in the Vacuum Ultraviolet .” 2016. Web. 26 Feb 2020.

Vancouver:

Carlson DR. Frequency Combs for Spectroscopy in the Vacuum Ultraviolet . [Internet] [Doctoral dissertation]. University of Arizona; 2016. [cited 2020 Feb 26]. Available from: http://hdl.handle.net/10150/612874.

Council of Science Editors:

Carlson DR. Frequency Combs for Spectroscopy in the Vacuum Ultraviolet . [Doctoral Dissertation]. University of Arizona; 2016. Available from: http://hdl.handle.net/10150/612874

University of Arizona

29. Butel, Guillaume. Analysis and New Developments Towards Reliable and Portable Measurements in Deflectometry .

Degree: 2013, University of Arizona

URL: http://hdl.handle.net/10150/311215

► Deflectometry is a powerful metrology technique that uses off-the-shelf equipment to achieve nm-level accuracy measurement. This process is typically made by scanning lines of pixels… (more)

▼ Deflectometry is a powerful metrology technique that uses off-the-shelf equipment to achieve nm-level accuracy measurement. This process is typically made by scanning lines of pixels or encoding the surface slopes information with phase using sinusoidal waves. Various measurement techniques exist, centroiding and phase-shifting being the most accepted, but their sensitivities vary with experimental conditions. We demonstrate solutions based on various parameters such as uncertainty or efficiency. The results are presented in a decision matrix and merit function. The parameters can be varied to represent various conditions. In particular, we are interested in using deflectometry in a context of fast, affordable and robust. Since none of the existing methods perform well under those parameters, we introduce a new method using binary patterns. Binary Pattern Deflectometry allows almost instant, simple and accurate slope retrieval, which is required for applications using mobile devices. We detail the theory of this new deflectometry method and the challenges of its implementation. Furthermore, the binary pattern method can also be combined with a classic phase-shifting method to eliminate the need of a complex unwrapping algorithm and retrieve the absolute phase, especially in cases like segmented optics where spatial algorithms have difficulties. Finally, whether it is used as a standalone or combined with phase-shifting, the binary patterns can, within seconds, calculate the slopes of any specular reflective surface. However there is no portable device to quickly measure eyeglasses, lenses, or mirrors. To complete the study, we present an entirely portable new deflectometry technique that runs on any Android™ smartphone with a front-facing camera. Our technique overcomes some specific issues of portable devices, like screen non-linearity or automatic gain control (AGC). We demonstrate our application by measuring an amateur telescope mirror and simulating the faulty Hubble Space Telescope primary mirror. In both cases, the application found the same amount of aberrations that were measured with an interferometer. Our technique can, in less than a minute, measure the sag errors of curved surfaces smaller than 50 nm RMS, simply using a smartphone. Advisors/Committee Members: Burge, James H (advisor), Burge, James H. (committeemember), Smith, Greg A. (committeemember), Su, Peng (committeemember), Liang, Rongguang (committeemember).

Subjects/Keywords: Optical Sciences

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

APA (6^th Edition):

Butel, G. (2013). Analysis and New Developments Towards Reliable and Portable Measurements in Deflectometry . (Doctoral Dissertation). University of Arizona. Retrieved from http://hdl.handle.net/10150/311215

Chicago Manual of Style (16^th Edition):

Butel, Guillaume. “Analysis and New Developments Towards Reliable and Portable Measurements in Deflectometry .” 2013. Doctoral Dissertation, University of Arizona. Accessed February 26, 2020. http://hdl.handle.net/10150/311215.

MLA Handbook (7^th Edition):

Butel, Guillaume. “Analysis and New Developments Towards Reliable and Portable Measurements in Deflectometry .” 2013. Web. 26 Feb 2020.

Vancouver:

Butel G. Analysis and New Developments Towards Reliable and Portable Measurements in Deflectometry . [Internet] [Doctoral dissertation]. University of Arizona; 2013. [cited 2020 Feb 26]. Available from: http://hdl.handle.net/10150/311215.

Council of Science Editors:

Butel G. Analysis and New Developments Towards Reliable and Portable Measurements in Deflectometry . [Doctoral Dissertation]. University of Arizona; 2013. Available from: http://hdl.handle.net/10150/311215

University of Arizona

30. Goldstein, Goldie L. Smart Temporal Phase Unwrapping for Biological Objects .

Degree: 2013, University of Arizona

URL: http://hdl.handle.net/10150/311573

► The development of a quantitative phase microscope (QPM) has allowed the ability to acquire real-time phase movies of biological processes. The image processing of the… (more)

▼ The development of a quantitative phase microscope (QPM) has allowed the ability to acquire real-time phase movies of biological processes. The image processing of the data is critical to the system's ability to measure relative changes. The phase data must be consistent throughout a measurement and background fluctuations must be minimized. The research presented in this work discusses methods to effectively process sequences of phase data such that it can be used to quantify changes within real-time studies of living cells. This work begins by exploring two-dimensional phase unwrapping to determine the most effective ways to estimate the measured phase surface. Conventional methods of comparing unwrapping performance will be used. In addition, a novel method will be introduced that can characterize accuracy using continuity of derivatives. It will be shown that the most accurate phase estimates are made using modulation data with quality-guided phase unwrapping. After two-dimensionally unwrapping all frames of data within a measurement, there are background fluctuations due to residual surface shape as well as mean phase value fluctuations. Traditionally, manual background removal methods are implemented. Due to the large streams of data that need to be analyzed for the QPM, an automated background removal method is introduced that automatically discriminates the background from features of interest and characterizes and removes the background shape from all frames within a sequence of data. No user intervention is required and the performance rivals manual methods. The final step in processing data from a QPM is to ensure consistent phase unwrapping over an entire dataset. This is a previously undiscussed topic within the field of quantitative phase microscopy. The two-dimensional phase unwrapping methods result in reasonable phase estimates of the measured sample however there are often inconsistencies in local regions amongst sequential frames of data. This work introduces a new method, Smart Temporal unwrapping that minimizes temporal inconsistencies. The image processing methods presented in this work combine to allow phase data acquired using a QPM to quantify relative changes in biological samples. These processing steps effectively minimize errors due to system vibration, residual measurement aberration, and phase unwrapping inconsistencies. Advisors/Committee Members: Wyant, James C (advisor), Wyant, James C. (committeemember), Creath, Katherine (committeemember), Greivenkamp, John (committeemember).

Subjects/Keywords: Optical Sciences

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Goldstein, G. L. (2013). Smart Temporal Phase Unwrapping for Biological Objects . (Doctoral Dissertation). University of Arizona. Retrieved from http://hdl.handle.net/10150/311573

Chicago Manual of Style (16^th Edition):

Goldstein, Goldie L. “Smart Temporal Phase Unwrapping for Biological Objects .” 2013. Doctoral Dissertation, University of Arizona. Accessed February 26, 2020. http://hdl.handle.net/10150/311573.

MLA Handbook (7^th Edition):

Goldstein, Goldie L. “Smart Temporal Phase Unwrapping for Biological Objects .” 2013. Web. 26 Feb 2020.

Vancouver:

Goldstein GL. Smart Temporal Phase Unwrapping for Biological Objects . [Internet] [Doctoral dissertation]. University of Arizona; 2013. [cited 2020 Feb 26]. Available from: http://hdl.handle.net/10150/311573.

Council of Science Editors:

Goldstein GL. Smart Temporal Phase Unwrapping for Biological Objects . [Doctoral Dissertation]. University of Arizona; 2013. Available from: http://hdl.handle.net/10150/311573

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