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 54 for “"optical waveguide"”.
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Optical waveguide analysis using transmission lines
Optical fibres have been used as a key medium for telecommunication and networking for more than two decades because in principle they offer sufficient transmission capacity, reaching total rates as high as Tbits/s per fibre. Critical fibre properties such as mode field profiles, single-mode …
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Enhanced Pathlength Absorption Measurements Using Optical Waveguide Structures
… was to devise methods to utilize the slab optical waveguide as a sampling geometry for quantitative enhanced pathlength absorption measurements. Studies were conducted both for analytes doped into polymer thin film waveguides and monolayers on top of the waveguide.
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Design of a CMOS compatible, athermal, optical waveguide
… possible design for a CMOS compatible, athermal, optical waveguide. The design explored is a slot waveguide with light guided in the low index material. A design paradigm is proposed which shows the relationship between cross-sectional parameters and their impact on both the effective index of …
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Novel materials and optical waveguide systems for silicon photonics
… on the characterization of structural and optical properties of three kinds of Si-based materials and devices. The first one is the study of SiOC thin films, carried within the TMR-POLYCERNET project financed by the European community. The scientific objective of this project is to create …
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Gallium and titanium diffused optical waveguide devices in sapphire
… thermal ionic diffusion. Passive and active waveguides were fabricated by thermal diffusion of gallium and titanium ions in sapphire.<br/><br/>Theoretical simulations were established which describe the potential of planar Ti:Sapphire waveguide lasers and intracavity wavelength selection …
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Fabrication of resonant optical waveguide biosensors using electron gun depositions
… A new biosensor being developed, the resonant optical waveguide biosensor, uses power transfer between two optical waveguides to detect the presence of an antigen. The condition for power transfer is extremely sensitive to changes in index of refraction and allows the biosensor to have a high …
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Planar integrated optical waveguide chemical sensors and novel transducer layer materials
The application of planar integrated optical waveguide (IOW) technology to chemical sensor development results in very sensitive, fast-response devices. The additional dimension of selectivity that is possible in these devices, through the ability to select an analytical wavelength of light …
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Analysis and characterization of slab-coupled optical waveguide amplifiers and lasers
Semiconductor optical devices are important in the photonics industry due to their significant advantages in size, weight, and power consumption (SWAP) and to their capability for photonic integration. However, these devices traditionally suffer from low fiber coupling efficiency and have been …
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Characterization of Diffusion Processes in Thin Polymer Films via Optical Waveguide Techniques
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1993.
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3-D optical waveguide arrays for in-vivo optogenetics : development and application
… geometric complexity. The ability to optically drive or silence sets of neurons distributed throughout complexly shaped brain circuits, in a temporally precise fashion, would enable analysis of how sets of neurons in different parts of the circuit work together to achieve specific …
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First Demonstration of beta-phase Gallium Oxide Optical Waveguide in Visible-UV Spectrum
… of beta-phase gallium oxide (β-Ga2O3) as optical waveguides on sapphire substrates grown by metal-organic chemical vapor deposition (MOCVD). Their propagation losses in the visible spectrum were comprehensively studied via experiments and simulations of the finite difference method by …
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On the feasibility of integrated optical waveguide-based in situ monitoring of microelectromechanical systems (MEMS)
… explores the feasibility of using integrated optical waveguides to measure the motion of microelectromechanical structures (MEMS). MEMS are a class of silicon devices which are being developed as sensors and actuators. Because these free moving structures are fabricated using processes similar …
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Holographic Control of Light Propagation in Optical Waveguides
Optical waveguides form the backbone of the internet and have also been a driving technology in medical imaging and optical sensing. Modern holography can now be used to control every aspect of light propagation along an optical waveguide. The application of holographic techniques offers the …
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Energy exchange processes in erbium-doped fluoride glasses
… interest has focused on diode-pumped lasers and optical waveguide amplifiers based on rare earth ions. This thesis is concerned with developing a model, which can explain the population and depopulation processes which are responsible for the spectroscopic behaviour of Er3+ ions in fluoride glass …
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Depth Profiling in Thin Films via Waveguide Spectroscopy
A novel optical depth profiling technique is developed to depth profile thin optically transparent films which can be fabricated in the form of an asymmetric slab optical waveguide. Various methods for depth profiling thin dielectric films are also reviewed in a manner which illustrates the utility …
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Ultrafast nonlinear optical properties of passive and active semiconductor devices
Nonlinear optical properties and ultrafast carrier dynamics of slab-coupled optical waveguide amplifiers, silicon nanowaveguides, and III-V semiconductor saturable Bragg reflectors are studied. The limits imposed by two photon absorption and free-carrier absorption on the gain and output powers of …
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