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.
Results
Showing 1 to 20 of 39 for “"optical device"”.
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Modified chalcogenide glasses for optical device applications
… examined and their potential for use as active optical materials is explored. It is also argued that the spectroscopic analysis of transition metal ions is a useful tool for evaluating the local environment of their host. Secondly femtosecond (fs) laser modification of GLS is investigated as a …
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Modified chalcogenide glasses for optical device applications
… examined and their potential for use as active optical materials is explored.It is also argued that the spectroscopic analysis of transition metal ions is a useful toolfor evaluating the local environment of their host. Secondly femtosecond (fs) lasermodification of GLS is investigated as a …
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New materials with potential for optical device applications: The synthesis and characterization of new mixed-metal quaternary sulfides and selenides
The search for new materials with desirable optical properties has become important in recent years. In particular, a need has emerged for compounds that are candidates for use as long-wavelength (8-12 $\mu$m) infrared window materials. At the present time there is a deficiency of suitable …
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Structural and Optical Properties of Gan-Based Heterostructures Grown by Plasma-Assisted Molecular Beam Epitaxy
… grown by PAMBE demonstrate their feasibility for optical device application. The excitonic transition properties observed from the MQW structures suggest the implementation of very thin, $<$50 A, quantum wells for high efficiency and emission uniformity.
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High Performance Indium-Gallium-Arsenide / Indium-Aluminum-Arsenide Transistors Grown on Indium-Phosphide by Molecular Beam Epitaxy
… a great deal of interest in electronic and optical device applications for this material system, and spurred enormous activities in opto-electronic integration. This thesis details the performance of many device structures investigated with state-of-the-art results. Non-alloyed contact …
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Affordable technologies for point-of-care diagnostics
… samples. In the next part of my work, I built an optical setup using off-the-shelf parts for the inexpensive detection of a fluorescent progesterone biosensor; next, I translated this solution-based progesterone biosensor into a paperfluidic format for inexpensive point-of-care testing. The first …
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Advances in elliptical-core two-mode optical fiber sensors
… the practicality of the elliptical-core two-mode optical fiber sensors for use in real-life applications are presented. The improvements include the development of insensitive lead fibers and an optical device which allows fringe counting at the output of the sensor. The insensitive leads …
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Liquid Crystal Materials And Tunable Devices For Optical Communications
… this dissertation, liquid crystal materials and devices are investigated in meeting the challenges for photonics and communications applications. The first part deals with polymer-stabilized liquid crystal (PSLC) materials and devices. Three polymer-stabilized liquid crystal systems are developed …
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A Study of miniature methods of terahertz spectroscopy
… techniques, we may fabricate micro-meter scale devices to generate and detect terahertz radiation. However, the complete spectroscope apparatus remains large due to the use of components such as lenses and mirrors designed in the far-field optical regime. A truly miniature terahertz spectroscope …
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Voltage programmable liquid optical devices
… at two types of voltage programmable liquid optical device. The first is a rotatable liquid crystal waveplate and the second is an amplitude programmable liquid phase grating. The rotatable waveplate was created by confining a droplet of E7 nematic liquid crystal between two glass substrates …
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Materializing Light: Real-time, Handheld Fabrication of Programmable Structural Color
… colored. We present MorphoChrome, an optical device for real-time, handheld, programmable structural color fabrication. Analogous to painting with light, MorphoChrome creates multicolor, structurally colored designs by exposing a commercially available holographic photopolymer film to …
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Opto-VLSI processing for reconfigurable optical devices
… of Wavelength Division Multiplexing system (WDM) optical fibre transmission systems has the potential to realise this high capacity data rate exceeding 10 Tb/s. The ability to reconfigure optical networks is a desirable attribute for future metro applications where light paths can be set up or …
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Achieving large stable vertical displacement in surface-micromachined microelectromechanical systems (MEMS)
… actuated diffractive mid-infrared optical device, which is robust, both to manufacture, and against pull-in during use. This device, called the Polychromator, is fabricated by polysilicon surface-micromachining and consists of many parallel elements, each 20 microns wide and a …
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UNIVERSAL CONTROL OF NOISELESS SUBSYSTEMS FROM SYSTEMS WITH ARBITRARY DIMENSION
… Moreover, I will present a proposal for an optical device which is capable of preparing a variety of these noiseless subsystem encodings through a postselection strategy.
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Extending the reach of anterior segment ophthalmic imaging
… The slit lamp, however, is a purely qualitative optical device that is bulky, expensive, can cause eye discomfort due to light sensitivity. It also requires a trained physician to operate, making it unsuitable for large-scale screening in resource-constrained settings. In this thesis, we propose …
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Estimativa de fluxo de calor sensível com suporte de cintilometria – estudo de caso : Cidade Universitária - Ilha do Fundão/RJ
The large aperture scintillometer (CinLA) is an optical device used to estimate averaged sensible heat fluxes (H) from fluctuations in the refractive index of the turbulent atmosphere in a light beam spread between a transmitter and a receiver. The present dissertation proposes to study the …
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III-V compound semiconductor selective area epitaxy on silicon substrates
… properties than silicon enable the electronic devices made of III-V materials to perform at higher switching speed. The integration of III-V semiconductor devices on silicon is the most approachable way that utilizes both the mature manufacturing technology of silicon CMOS circuits and the good …
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Design and transformation of three dimensional pupils : diffractive and subwavelength
… holograms are good candidates for pupils of optical imaging systems thanks to their three--dimensional structure, which provides richer design flexibility compared to conventional two--dimensional pupils. In this thesis, I will propose the system design as well as the optimization of depth …
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