Chan Jacklynn = 摻近紅外染料溶凝膠薄膜之光學及激光性質研究 / 陳在琳. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2005. / Includes bibliographical references (leaves 137-152). / Text in English; abstracts in English and Chinese. / Chan Jacklynn = Shan jin hong wai ran liao rong ning jiao bo mo zhi guang xue ji ji guang xing zhi yan jiu / Chen Zailin. / Abstract --- p.i / Acknowledgements --- p.v / Publications --- p.vii / Table of Contents --- p.viii / List of Figures --- p.xi / List of Tables --- p.xiv / Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Sol-gel Glass Waveguides --- p.3 / Chapter 1.2 --- Ellipsometry --- p.7 / Chapter 1.3 --- Aim of this Research Work and Organization of Thesis --- p.12 / Chapter 2 --- Basics on Ellipsometry --- p.16 / Chapter 2.1 --- Principle of Ellipsometry --- p.17 / Chapter 2.1.1 --- Definition of Ellipsometric Parameters --- p.17 / Chapter 2.1.2 --- Configurations of an Ellipsometer --- p.22 / Chapter 2.2 --- Mathematical Representation of Ellipsometry --- p.26 / Chapter 2.2.1 --- Bulk Material Structure --- p.26 / Chapter 2.2.2 --- Single Layer Structure --- p.28 / Chapter 2.3 --- Parameterization of Optical Functions --- p.31 / Chapter 2.3.1 --- Optical Functions --- p.34 / Chapter 2.3.2 --- Regression Analysis --- p.38 / Chapter 3 --- Modification of Rotating-Polarizer-Analyzer Ellipsometer --- p.40 / Chapter 3.1 --- Principle of RPA System --- p.41 / Chapter 3.2 --- Optical Setup of RPA System --- p.45 / Chapter 3.3 --- Components of the System and Modification for Infrared Measurement --- p.47 / Chapter 3.3.1 --- Light Source --- p.47 / Chapter 3.3.2 --- Monochromator --- p.52 / Chapter 3.3.3 --- Polarizers and Analyzer --- p.53 / Chapter 3.3.4 --- Detector and Data Reduction --- p.54 / Chapter 3.4 --- Optical Alignment --- p.59 / Chapter 3.5 --- Alignment of the Azimuthal Angles of the Polarizers --- p.61 / Chapter 3.6 --- Calibration Procedure --- p.63 / Chapter 3.6.1 --- Calibration by Gold Film on Silicon --- p.63 / Chapter 3.6.2 --- Calibration by Silicon Dioxide Film on Silicon --- p.67 / Chapter 4 --- Near Infrared Dyes in Sol-gel Waveguides --- p.72 / Chapter 4.1 --- Sol-gel Process --- p.73 / Chapter 4.2 --- Near Infrared Dyes in Sol-gel Waveguides --- p.77 / Chapter 4.2.1 --- Development of Near Infrared Dyes --- p.77 / Chapter 4.2.2 --- Studies on Near Infrared Dye Solid State Laser --- p.79 / Chapter 5 --- Optical Properties of Dye-doped Sol-gel Waveguides --- p.83 / Chapter 5.1 --- Experimental Procedure --- p.84 / Chapter 5.1.1 --- Preparation of Samples --- p.84 / Chapter 5.1.1.1 --- Materials --- p.84 / Chapter 5.1.1.2 --- Procedure --- p.86 / Chapter 5.1.2 --- Discussion on Synthesis of Infrared Dye-doped Sol-gel Waveguides --- p.88 / Chapter 5.1.2.1 --- Choice of Solvents --- p.89 / Chapter 5.1.2.2 --- Thermal Treatment and Lifetime --- p.93 / Chapter 5.1.2.3 --- Necessity of Addition of GLYMO --- p.94 / Chapter 5.1.3 --- Sample Characterization --- p.96 / Chapter 5.2 --- Surface Morphology --- p.97 / Chapter 5.3 --- Optical Properties of Dye-doped Zirconia Organically Modified Silicate Waveguides --- p.100 / Chapter 5.3.1 --- Modeling of Ellipsometric Values --- p.101 / Chapter 5.3.2 --- Interpretation of the Modeling Results --- p.107 / Chapter 6 --- Amplified Spontaneous Emission Based on Sol-gel Waveguides --- p.109 / Chapter 6.1 --- Experimental Setup --- p.110 / Chapter 6.2 --- Features of ASE and Fluorescence --- p.112 / Chapter 6.3 --- Prolonged Thermal Treatment Effect on Light Emission --- p.119 / Chapter 6.3.1 --- Difference in Preparation of Samples --- p.121 / Chapter 6.3.2 --- Light Emission of Samples under Extended Thermal Treatment --- p.123 / Chapter 6.3.3 --- Directionality of the Emission --- p.125 / Chapter 6.3.4 --- Some Features of the Emission --- p.127 / Chapter 7 --- Conclusion and Recommendation --- p.133 / Chapter 7.1 --- Conclusion --- p.133 / Chapter 7.2 --- Recommendation --- p.135 / Bibliography --- p.137

Liang Tak-keung. / "June 2004." / Thesis (Ph.D.)--Chinese University of Hong Kong, 2004. / Includes bibliographical references. / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Mode of access: World Wide Web. / Abstracts in English and Chinese.

by Anhui Liang. / Thesis (Ph.D.)--Chinese University of Hong Kong, 1996. / Includes bibliographical references (p. D1-D4). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Mode of access: World Wide Web.

Wang Jun. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2003. / Includes bibliographical references (leaves 74-79). / Abstracts in English and Chinese. / Acknowledgements --- p.i / List of publications --- p.ii / Abstract (In English) --- p.iii / Abstract (In Chinese) --- p.v / Table of contents --- p.vii / List of figures --- p.x / List of tables --- p.xiv / Chapter Chapter I --- Introduction --- p.1 / Chapter Chapter II --- Dye-doped sol-gel zirconia and zirconia-organically modified silicate waveguides --- p.6 / Chapter 2.1 --- General sol-gel process --- p.6 / Chapter 2.2 --- Dye-doped sol-gel zirconia and zirconia-ORMOSIL waveguides --- p.7 / Chapter Chapter III --- Basic theory and experiment setup of distributed feedback waveguide lasers --- p.13 / Chapter 3.1 --- Coupled-wave theory of distributed feedback lasers --- p.13 / Chapter 3.2 --- Introduction on the theory of planar optical waveguide --- p.16 / Chapter 3.3 --- Experiment setup design of DFB waveguide lasers --- p.19 / Chapter Chapter IV --- Zirconia and zirconia-organically modified silicate distributed feedback waveguide lasers tunable in the visible --- p.23 / Chapter Chapter V --- Tunable multi-wavelength distributed feedback zirconia waveguide lasers --- p.35 / Chapter 5.1 --- Brief introduction on multi-wavelength lasers --- p.35 / Chapter 5.2 --- R6G-doped zirconia multi-mode waveguides --- p.36 / Chapter 5.3 --- Experimental results and discussion --- p.39 / Chapter 5.3.1. --- Dual- and quadruple-wavelength DFB waveguide lasers --- p.39 / Chapter 5.3.2. --- The dispersion characteristics of multi-wavelength DFB waveguide lasers --- p.44 / Chapter 5.3.3. --- Determination of waveguide parameters by the DFB technique --- p.48 / Chapter 5.4 --- Summary --- p.51 / Chapter Chapter VI --- Distributed feedback laser action in sol-gel glass symmetric waveguides --- p.53 / Chapter 6.1 --- The fabrication of dye-doped glass symmetric waveguides --- p.54 / Chapter 6.2 --- Experimental results and discussion --- p.56 / Chapter 6.2.1. --- DFB laser action in sol-gel glass symmetric-asymmetric waveguide --- p.56 / Chapter 6.2.2. --- Dispersion characteristics of DFB symmetric and asymmetric waveguide lasers --- p.61 / Chapter 6.3 --- Summary --- p.65 / Chapter Chapter VII --- Summary --- p.69 / References --- p.74

No description available.

by John Reed.

Thesis (M.S.)--University of Delaware, 2006. / Principal faculty advisor: Robert P. Gilbert, Dept. of Mathematical Sciences. Includes bibliographical references.

Dielectric waveguides are becoming important for their numerous applications in integrated optics. The study of dielectric waveguides by analytical techniques is not sufficient for many variations in waveguide shape, anisotropy, and inhomogeneity commonly encountered in waveguide materials. This work studies the finite element method as an accurate tool for the numerical modeling of dielectric waveguides. Other commonly used numerical techniques are also considered. The implementation of the finite element method is discussed. The finite element technique is also modified to incorporate the lack of fixed-potential boundary conditions in dielectric waveguides. The results of the simulations are documented for several experimental and analytical test cases. Measurements were made on waveguides fabricated in-house using the plasma-enhanced chemical vapor deposition (PECVD) films of silicon oxynitride. The light source was a 6328 A helium-neon laser. The results of the finite element simulations are compared with the experimental results and with other previously documented numerical and analytical results from the literature. The finite element method developed here is shown to be in good agreement with these results and will be useful in solving for the modes of novel waveguide designs. / Graduation date: 1993

Investigation of the Double-Y Balun for Feeding Pulsed Antennas Jaikrishna Venkatesan 232 Pages Directed by Dr. Waymond Scott, Jr. In this research, a double-y balun implemented with coplanar waveguide (CPW) and coplanar strip (CPS) was investigated for use with pulsed antennas. The balun was modeled using two commercial electromagnetic simulators: Momentum and HFSS. Using these numerical solvers, design information such as the design of CPW bridges, aspect ratio of the double-y balun, and stub lengths of the CPW and CPS open and short stubs were studied. A dipole, along with the outer conductor of a coaxial line was modeled in NEC. The model was used to study the currents along the arms and feedline of balanced and unbalanced dipoles. Normalized amplitude patterns were generated along the azimuth and elevation planes for balanced and unbalanced dipoles. These patterns were used later for comparison with measured patterns. Experimental work was conducted to measure the performance of a double-y balun designed to feed a resistively loaded V-dipole. The performance of the balun was investigated via VSWR, insertion loss, and antenna pattern measurements. Antenna pattern measurements along the azimuth plane were conducted for a 5 cm dipole fed without a balun, a 5 cm dipole fed with the double-y balun, a 5 cm dipole fed with the sleeve balun, a 12 cm dipole fed without a balun, and a 12 cm dipole fed with the double-y balun. The dipoles fed without a balun were fed directly with a 50 W coaxial line. An optical link, consisting of a laser modulator (LM) unit and a laser receiver (LR) unit, was constructed to measure the patterns along the elevation plane of the above dipoles. Resulting patterns agreed closely with patterns generated with NEC models. In addition, the patterns of a resistively loaded V-dipole were measured along the E-plane using the optical link. The measured patterns for the V-dipole were compared with numerical results obtained from literature. The experimental work conducted in this research illustrates the improvement obtained in the patterns of a dipole and a resistively loaded V-dipole with the use of the double-y balun.

The work described herein focuses on FT-IR and quantum cascade laser (QCL) based studies towards the development of compact and portable trace gas sensor for benzene, toluene, and xylenes (BTX). FT-IR broadband radiation was used to probe the mid-infrared fingerprint region for quantitatively detecting trace gas levels of BTX. Using direct absorption through a hollow waveguide, parts-per-million (ppm) detection limits for BTX with a response time of 39 seconds was demonstrated. Univariate calibration provided limits of detection (3σ) for benzene, toluene, and meta-xylene at 5, 17, and 11 ppm, respectively. Multivariate calibration using partial least squares regression algorithms were used to simulate real-world conditions with multiple analytes present within a complex sample. A calibration model was built with 110 training set standards enabled by using a customized gas mixing system. Furthermore, a preconcentration/thermal desorption (TD) step was added to the FT-IR HWG trace gas sensor enabling parts-per-billion detection of BTX. A univariate calibration was established in the laboratory with certified gas standards over a dynamic range of 1000 - 100 ppb for benzene, toluene, and the xylenes. The sensor was then taken to an industrial site during a field measurement campaign for the quantitative determination of BTX in field air samples. The laboratory calibration was used to predict unknown concentrations which were in close agreement with industrial hygiene standard techniques, and industrial prototype analyzers, that were simultaneously operated in the field environment. In addition to FT-IR, quantum cascade laser spectroscopy was also investigated due to enhanced spectral density and efforts to precisely overlap emission with analyte absorption. Particular efforts were dedicated on a novel principle for consistent and deliberate QCL emission wavelength selection by varying the QCL cavity length. These studies experimentally confirmed that using this straight-forward post-processing technique, emission wavelength tuning across a range of one hundred wavenumbers range may be achieved. This tuning range was experimentally demonstrated for a QCL emitting across an entire absorption feature of carbon dioxide by tailoring the length of the cavity. Additionally, using an external cavity (EC) - QCL combined with a HWG gas sensor module for the first time enabled the quantitative and simultaneous determination of ethyl chloride, trichloromethane, and dichloromethane within exponential dilution experiments at ppb limits of detection. Multianalyte detection was demonstrated utilizing partial least squares regression for quantitative discrimination of individual constituents within a mixture, yet applying a single broadly tunable QCL light source.