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 12 of 12 for “"photonic crystal (PhC)"”.
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Microstructured tungsten thermophotovoltaic selective emitters c by Natalija (Zorana) Jovanović.
… and application of tungsten two-dimensional (2D) photonic crystal (PhC) structures as selective emitters and means of achieving higher efficiencies in thermophotovoltaic (TPV) energy conversion systems. Important aspects of the fabrication process are researched, developed, and rigorously …
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Evanescently Coupled Vertical Cavity Laser Arrays
… two types of evanescently coupled VCSEL arrays: photonic crystal (PhC) and implant-defined arrays. Both array types exhibit electronic beam-steering due to a variable phase difference between neighboring lasers. This phase difference is tunable with changes in the differential current injection …
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Vertical Cavity Surface-Emitting Lasers Operating With Multiple Photonic Crystal Defect Cavities
… is the introduction of a two-dimensional photonic crystal (PhC) pattern with a defect, etched into the top distributed Bragg reflector, to define a defect cavity in a VCSEL. This dissertation investigates the operation of PhC VCSELs that have multiple defect cavities to form arrays of …
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Photonic crystal enhanced LED for electroluminescence cooling
… In this thesis, we design and fabricate a photonic crystal (PhC) enhanced unencapsulated LED for direct observation of ELC. The PhC pattern and the structure of the device are optimized to achieve approximately 76% extraction efficiency and 300 [mu]W/cm2 net cooling power. The LED is …
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Tunable Three-Dimensional Photonic Crystal Microwave Resonator with Ultra-Small Mode Volume
… on a design of three-dimensional (3D) dielectric photonic crystal (PhC) cavity (PhCC) based on ABCD woodpile structure. Low material loss of the dielectric and radiation loss suppression of the 3D PhC’s complete bandgap give PhCC high quality factor (𝑄). The design also includes field focusing …
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Photonic crystal emitters in heterogeneously bonded membranes
Photonic crystal (PhC) membrane lasers are good candidates for future photonic integrated circuit applications, including chip-to-chip and on-chip optical interconnects. This is due to their small size, lithographically tunable emission wavelength, and potential for low power operation. In order to …
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High efficiency thermophotovoltaic microgenerators
… (TPV) system using a metallic microburner, photonic crystal (PhC) emitter, and low bandgap TPV cells. Many technologies (fuel cells, Stirling, thermoelectric, etc.) that potentially enable a portable millimeter-scale hydrocarbon microgenerator are under active investigation because …
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Organic lasers and nanostructred organic films for hybrid integration
… a promising category of organic materials for photonic applications owing to their potential for simple fabrication and availability of materials emitting across the whole visible spectrum. LEPs are already exploited commercially in the case organic light emitting diodes and their interesting …
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New inverse opal hydrogels as platform for detecting macromolecules
… sensitivemodulation of the visual band gap of a photonic crystal (PhC), which is induced by the selective binding of analytes, triggering a volume phase transition. The PhCs introduced by this work show a high sensitivity not only for small biomolecules, but also for large analytes, such as …
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Toward an active CMOS electronics-photonics platform based on subwavelength structured devices
… further improve computing performance. Silicon photonics, compatible with CMOS platform manufacturing, presents a promising means to achieve on-chip optical links, employing highly sensitive microring resonator devices that demand electronic feedback and control due to fabrication variations. …
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Designing subwavelength-structured light sources
… first applied to analyze lasing action in the photonic crystal (PhC) slabs. This class of lasers, commonly referred to as the photonic crystal surface-emitting lasers (PCSELs), can be integrated on-chip and is essentially the two-dimensional (2D) versions of the second-order distributed …
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Unified conformal/nonconformal domain decomposition methods for solving large-scale multi-region electromagnetic problems
In this dissertation, robust and efficient numerical algorithms are developed based on the dual-primal finite element tearing and interconnecting (FETI-DP) method for the full-wave analysis of large-scale electromagnetic problems in three dimensions. These algorithms are designed to expand the …