Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"planar waveguides"”.
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Integration of glass microspheres and planar waveguides for microsphere lasers
… this work, the integration of microspheres with planar waveguides is the main focus. High quality neodymium-doped BK7 microspheres are fabricated and characterised to observe laser oscillation at 1.06 µm from the <sup>4</sup>F<sub>3/2</sub> - <sup>4</sup>I<sub>11/2</sub> transition. …
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Ray analysis of tapered graded-index planar waveguides and fibers
… of linearly tapered parabolic-index optical waveguides are investigated. Tapers with planar (two-dimensional) and fiber (three-dimensional) geometries are considered. A ray optics approach is used in the analysis, assuming that the characteristic dimensions of tapered waveguides are small …
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Fabrication and characterization of Phosphate-based planar waveguides activated by Er3+ ions
… that it is possible to fabricate phosphate-based planar wave-guides activated by rare earth ions both by sol-gel and RF-sputtering techniques. The objective of this thesis has been to evaluate various methodologies for fab-rication Phosphorous-based planar waveguides. In this context sol-gel and …
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Investigation of Planar Waveguides and Components for Millimeter-Wave Integrated Circuits (Electromagnetics, Fin-Line, Dielectric)
Several important elements in millimeter-wave integrated circuit systems are studied. Filter-type structures which are composed of a series of discontinuities are employed frequently in such systems. The study of the general discontinuity problem is thus very important.
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Fabrication and characterization of silicon nitride thin film planar waveguides produced by RF magnetron sputtering technique
Silicon nitride based planar waveguides play an important role in biosensing applications. Conventional fabrication of silicon nitride waveguides utilizes the chemical vapor deposition (CVD) technologies. Silicon nitride waveguide abrication through magnetron sputtering is still unexplored and a …
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An experimental and theoretical investigation of waveguide scatter, with applications to solution-deposited silica-titania planar waveguides
… and core refractive index fluctuations in planar waveguides was performed, with an emphasis placed on applications in solution-deposited SiO₂-TiO₂ (silica titania) planar waveguiding systems. A perturbation theory was used to model TE₀ mode scattering from surface and volume microstructure, …
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The application of thin film planar waveguides as a refractive index detector for microscale high performance liquid chromatography
Thin film planar waveguides were originally introduced in microwave engineering. The spectroscopist began to use such waveguides as tools to solve chemical characterization problems since Harrick and Fahrenfort introduced the Attenuated Total'Reflection (ATR) in the early 1960's. Today, planar …
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High-average-power planar waveguide lasers
… progress towards high-average-power diode-pumped planar waveguide lasers. As a format of the laser active medium, planar waveguides take advantage of their extreme slab geometry, which is compatible with that of high-power diode lasers, offer a great degree of versatility of the pump arrangement, …
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Pulsed laser deposition of thick multilayer garnet crystal films for waveguide laser devices
… to fabricate thick multilayered garnet crystal planar waveguides with rare-earth ion doped cores for use as planar waveguide laser devices. Planar waveguides are of interest because of the implications of their structure, which allows for lasing, pumping and heat dissipation to each have a …
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Novel rare-earth-doped planar waveguide lasers
The planar guided-wave geometry is compatible with a wide range of materials, waveguide architectures and fabrication techniques. This thesis reports a series of studies of rare-earth-doped planar waveguide lasers, exploiting and extending the diverse range of possibilities that can be applied to …
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The application of planar optical waveguides to absorption spectrometry in flow injection analysis
… The feasibility of using a thin film planar waveguide as an absorption sensor in the Flow Injection Analysis of Urea was investigated. Urea was hydrolyzed to ammonia and carbon dioxide with the enzyme Urease. The ammonia produced was quantitated colorimetrically using Berthelot’s …
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Energy transfer and waveguide studies of Eu3+ and Tb3+ doped 2 SiO2-TiO2 glass prepared via the sol-gel route
… method is a means to develop rare-earth doped planar waveguides for such integrated optics components. The sol-gel process involves three main steps: first, a metal alkoxide (Si-alkoxide) in alcohol-based medium undergoes hydrolysis at a predetermined pH; the next step involves condensation, …
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Investigation of nonlinear processes and device designs applicable to the creation of a compact, broadly tunable laser based on a tantalum pentoxide planar lightwave circuit platform
… an alternative widely tunable laser in a planar lightwave circuit (PLC) format. The overall aim of this project was to investigate the viability of creating a functional on-chip tunable laser, develop some of the key components, the base technologies required to do this …
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Multi-connection vias for printed circuit boards
… features, such as striplines, microstrips and co-planar waveguides are tuned to control signal impedance. Conventional multi-layer vertical interconnects, which connect between board layers, are not impedance matched to the in-plane signal traces. Multi-connection vias, developed in this thesis, …
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Writing and characterisation methods for UV-photosensitivity based devices and their applications
… mechanisms in optical fibres and planar waveguides for the fabrication of advanced integrated optical devices for telecoms and sensing applications. One major scope is the improvement of grating fabrication specifications by introducing new writing techniques and the use of …
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Fabricating silicon germanium waveguides by low pressure chemical vapor deposition
… modeling, and testing of LPCVD Si Ge waveguides. Thesis research was conducted during a six-month internship at Applied Materials, a semiconductor equipment manufacturing company. The present work can be divided into two parts: developmental work on the Applied Materials' Epi Centura® …
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Development and characterisation of phosphate glasses for athermalisation
… of phosphate glasses. <br/><br/>Both fibre and planar waveguides were fabricated. Extrusion was used to prepare the preform for fibre drawing. The extrusion process used a two-die assembly to extrude dissimilar glasses, and is the first demonstration of its kind. The spin-coating process was …
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Modeling and Analysis of Photonic Crystal Waveguides
… investigate several aspects of photonic crystal waveguides through modeling and simulation. We introduce a one-dimensional model for two-dimensional photonic crystal fibers (PCFs), analyze tapered PCFs, analyze planar photonic crystal waveguides and one-dimensional PCFs with infinite periodic …
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Numerical modelling of optical micro-cavity ring resonators for WDM networks
… in order to meet these demands. Optical planar waveguides stand as one of vital employed approach in many studies. Although, their low propagation loss, and low dispersion, they suffers from high power losses at sharp bends. For this reason, large radius of curvature is required in order …
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