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 48 for “"microcavities"”.
-
Spectral properties and modes of surface microcavities
… mode structure of nearly hemispherical microcavities. The nearly hemispherical microcavity structures are fabricated electrocemically through a template of self assembled latex spheres. Controlling the electrochemical parameters, such as the electrochemical solution and electrode …
-
Terahertz oscillation and stimulated emission from planar microcavities
… the number of states is limited. In the smallest microcavities, i.e. micrometer sized optical resonators, the propagation of only one mode is permitted that is simultaneously amplified internally. This particularly strong enhancement of the electric field is directly related to the quality factor …
-
Whispering gallery mode microcavities: from fabrication to applications
Trapping and cooling macroscopic objects using light has attracted great interest recently as it may enable us to see quantum mechanical features in large systems. A microsphere pendulum is one such system to put it to test. This thesis work is devoted to solving many of the steps necessary for …
-
Linear and nonlinear optical processes in GaAs semiconductor microcavities
… thesis, polariton dynamics in GaAs semiconductor microcavities are investigated. Insertion of layers of active material within a Fabry-Perot resonator leads to strong coupling between excitons and photons, giving rise to new eigenmodes called excitonpolaritons.<br/><br/>Bose-Einstein condensation, …
-
Optically nonlinear spatial and spectral processes in semiconductor microcavities
… analysis of polariton dynamics in semiconductor umicrocavities. A microcavity is a monolithic structure composed of two distribnted Bragg reflectors which are separated by a layer of active material. Strong coupling between excitons residing in the active layer and photons confined within the …
-
Advanced silicon photonic microcavities for routing, detection and lasing applications
The theoretical background of microcavities for photonic applications has been extensively investigated in theory over the past two decades. These structures provide the ability to filter wavelength, support high-Q modes and enhance intensity within the cavities while maintaining a small device …
-
The physics and chemistry of semiconductor nanocrystals in sol-gel derived optical microcavities
… of NC-based lasers through sol-gel derived microcavities, from distributed feedback (DFB) grating structures to spherical microresonators exhibiting whispering-gallery mode lasing. Chapter 4 compares and explicates the differences between silica and titania as host matrices for NCs in terms …
-
Light-Matter Interactions in High-Efficiency Photovoltaics, Light-Emitting Devices, and Strongly Coupled Microcavities
… photovoltaics, heavy metal-free QD-LEDs and microcavities, and two-dimensional perovskite microcavity exciton-polaritons. First, we quantify the PCE enhancements due to photon recycling in high-efficiency Cs₀.₀₅(MA₀.₁₇FA₀.₈₃)₀.₉₅Pb(I₀.₈₃Br₀.₁₇)₃ (triple-cation) perovskite thin film …
-
Controlling CRUD vapor chimney formation in LWRs through surface modification
… pressure. Samples with various pitches of microcavities and microposts were boiled in simulated PWR coolant. The effect of heat flux on CRUD formation was also examined. The experiments support previous theories that subcooled nucleate boiling is enhanced at microcavities, and that CRUD …
-
Resonant Spatial Light Modulation: Optical Programming and Sensing at the Fundamental Limit
… (i) near-unity vertical coupling to high-finesse microcavities through inverse design, (ii) scalable fabrication of photonic crystal circuits by optimized, 300 mm full-wafer processing, (iii) picometer-precision resonance alignment using automated, closed-loop “holographic trimming”, and (iv) …
-
Control of Nonlinear Properties of van der Waals Materials
… physics. Strong coupling of emitters to microcavities provides many opportunities for new exotic physics through the formation of hybrid quasi-particles exciton-polaritons. This thesis<br />focuses on exploring and enhancing nonlinearity of van der Waals materials through strongly …
-
Theory of terahertz intervalence band polaritons and antipolaritons.
… (THz) radiation with intersubband excitations in microcavities leading to THz polaritons and antipolaritons. The approach is based on the dielectric function formalism. The dielectric constant is derived from an optical susceptibility evaluated with Non Equilibrium Many Body Green's Functions …
-
Modeling of fluids and waves with analytics and numerics
… as lasers and nonlinear devices require optical microcavities with long lifetimes Q and small modal volumes V. While most microcavities are designed mostly by hand using some understanding of the physical principles of the confinement, we let the computer discover its own structures. We formulate …
-
The study of surface SHG and polygonal microcavity design for nonlinear applications on LiNbO<sub>3</sub>
… (SHG) studies and for the designs of polygonal microcavities for nonlinear applications. <br/><br/>Reflection second harmonic generation (RSHG) experiments were performed on LiNbO<sub>3</sub> to reveal the interfacial layer symmetry as the crystal is rotated around the z axis. RSHG was also …
-
Flexible and transparent microcavity plasma devices: fabricated by polymer-based replica molding technique
… enables inexpensive and accurate production of microcavities of the devices. Best known as the sources of visible, ultraviolet (UV) and vacuum ultraviolet (VUV) radiation, microplasma devices fabricated by replica molding techniques also show potential applications as transparent and flexible …
-
Design and fabrication of one-dimensional and two-dimensional photonic bandgap devices
… consist of monorail and air-bridge waveguide microcavities, while the two-dimensional photonic bandgap devices consist of light-emitting devices with enhanced extraction efficiency. Fabrication techniques such as gas source molecular beam epitaxy, direct-write electron-beam lithography, …
-
Ordered photonic microstructures
… regime, omnidirectional reflectors and thin film microcavities are demonstrated using sol-gel and solid-state materials. A first demonstration of omnidirectional reflectivity in sol-gel structures was accomplished using a dielectric stack consisting of 12 spin-on Si02/Ti02 quarterwave sol-gel …
-
Mirror-Coupled Nanoantennas with Hexagonal-Boron Nitride Spacers
… embedded in gold form planar Fabry-Perot half-microcavities. Gold nanoparticles on top of these microcavities form previously unidentified angle- and polarization-sensitive nanoresonator modes that are tightly laterally confined by the nanoparticle. Comparing dark-field scattering with …
-
Energy transfer and luminescence enhancement in Er-doped silicon
… emission enhancement in nrnltilayer Si/Si02 microcavities was explored as a means to increase the PL intensity. Because multilayer microcavity structures cannot be constructed using single crystal silicon, Er-doped polysilicon (poly-Si:Er) was developed as a light emitting material for these …
-
Microstructural Control of Aluminum/aluminum Oxide Electrochemistry: Aluminum/aluminum Oxide Photonic Devices
… devices with parabolic cross-sectional microcavities and conformal aluminum electrodes, operating in Ne/Xe gas mixtures. In addition, a microchannel plasma device with complex electrode geometries have been fabricated in a single sheet of aluminum foil with an active area of over 30 cm …
Page 1 of 3