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 78 for “"Microcavity"”.
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Propulsion performance of a microcavity discharge device
… A candidate system is proposed in the form of a microcavity discharge device modified for use as an electrothermal thruster, called a MCD thruster. Development of the MCD thruster was primarily experimental in nature, although computational modeling provided validation and suggested future …
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Development of vertical cavity transistor laser and microcavity laser
… small volume and high Q cavity can be applied in microcavity VCSELs, enhancing the spontaneous recombination rate. In the first part of the dissertation we demonstrate that the microcavity VCSEL has a reduced recombination rate of 0.5 ns when the aperture size is less than 3 μm. With improved RF …
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Silicon microcavity and microchannel plasma devices: spectroscopy and time-resolved optical experiments
Novel microcavity and microchannel plasma devices in Si have provided new and efficient sources of visible, ultraviolet (UV) and vacuum ultraviolet (VUV) radiation. The realization of this new platform for devices is implemented through VLSI and MEMS fabrication techniques. In this thesis, the …
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The design and fabrication of an electrically activated photonic crystal microcavity laser
… the dominant cavity mode than spurious modes. Microcavity lasers exploit this stronger coupling by confining photons to a cavity with outer dimensions approximately the size of an optical wavelength. Owing to the strong coupling to the lasing mode, microcavity lasers are distinguished for their …
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Supersonic cooling of short-lived molecular states in a pulsed microcavity plasma jet
"Electronic states of helium diners having potential energy > 24 eV and radiative lifetimes as short as 19 ns have been generated in a micro-plasma jet at super-atmospheric pressure and rotationally cooled by supersonic expansion. Spatial-temporal spectrograms of d^3Σ+u→(b^3)π_g (v', v"") = (0, 0) …
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Design, fabrication, and characterization of high-speed light-emitting transistors and microcavity lasers
… and interconnects. It has been shown that a microcavity vertical-cavity surface-emitting laser employing small aperture buried-oxide current and field confinement is also demonstrated with wider mode spacing and faster carrier recombination lifetime (enhanced Purcell factor ~ 2 to 8 times, …
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Flexible and transparent microcavity plasma devices: fabricated by polymer-based replica molding technique
The fabrication of flexible and transparent microplasma devices using plastic substrate has explored new avenues in plasma science and technology. A polymer-based replica molding process enables inexpensive and accurate production of microcavities of the devices. Best known as the sources of …
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The study of surface SHG and polygonal microcavity design for nonlinear applications on LiNbO<sub>3</sub>
… the operational modes of a resonating hexagonal microcavity, made from bulk LiNbO<sub>3</sub> crystal was reviewed for nonlinear device applications. A model for a total internal reflection (TIR) technique for the QPM method in a double-resonating hexagonal microcavity was formulated. The TIR-QPM …
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Control of Exciton Photon Coupling in Nano-structures
… in three parts: light-matter interaction in microcavity structures, direct dipole-dipole interactions, and plasmon-exciton interaction in metal-semiconductor systems. </p> <p>In the microcavity structures, the light-matter interactions become significant when the excitonic energy is in …
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Silicon microplasma devices as real-time sensors of bulk plasma
Silicon microcavity devices have been demonstrated to exhibit photodetection capabilities. This thesis explores the possibility of using silicon microcavity devices as passive photodetectors for bulk plasma to serve as a diagnostic tool. The voltage-current characteristics of the device show that …
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Cold-cavity measurement of excess optical loss in oxide-confined vertical cavity surface emitting lasers
Microcavity laser design and performance optimization requires a quantitative knowledge of the cavity optical losses. A generalized method using sub-threshold spectral measurements matched to model calculations is demonstrated to determine optical loss in microcavity lasers. Cold-cavity spectral …
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Coupled phenomena in arrays of microplasma devices and microchannel plasma devices as antennas
Arrays of microcavity and microchannel plasmas with characteristic dimensions of 25-800 micrometer have been generated in glass substrates. To reproducibly fabricate the arrays, glass micromaching using replica molding and micropowder blasting was proposed and demonstrated. The microplasmas were …
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The development of novel passive and active photonic-crystal devices
… efficient devices such as waveguides, splitters, microcavity filters, light emitting diodes, and lasers. Previous experimental research has mainly focused on photonic crystals composed of a lattice of air holes etched into dielectric slabs. This thesis discusses the design, fabrication, and …
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Optical control of polariton condensation and dipolaritons in coupled quantum wells
… of light with an exciton transition inside a microcavity. A sufficiently dense cloud of polaritons condenses into a polariton condensate, a state of matter showing macroscopic coherence and superfluid properties, whose dynamics are influenced by the cycle of constant pumping and decay of …
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Exciton-polaritons in thermal equilibrium : from Bose-Einstein condensation to exciton-polaritonics
… quantum mechanical collective system, namely, microcavity exciton-polariton Bose-Einstein condensates. Microcavity exciton-polaritons, hereafter simply polaritons, are bosonic quasiparticles formed in a resonant semiconductor microcavity by coupling the excitonic polarizabilities in quantum …
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Optical loss and high-speed modulation of vertical-cavity surface-emitting lasers
… surface-emitting lasers (VCSELs) are microcavity semiconductor lasers used extensively as the light source of short-haul optical data communication and optical interconnects. By increasing the efficiency and modulation speed of these devices, it will be possible to continue to meet a …
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One-dimensional simulation of vertical-cavity surface-emitting lasers including energy transport
… and thermionic emission in the quantum regions. Microcavity effects on the stimulated and spontaneous emission are carefully included via the enhancement of the vacuum and radiating electromagnetic fields in a VCSEL. A modified photon rate equation is implemented which predicts lasing off …
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Spectral properties and modes of surface microcavities
… 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 potential. allows a wide range of nearly …
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Coherently-driven exciton polaritons and directional cQED effects in the quantum dot-micropillar system
… to a single quantum emitter confined in a microcavity. Major technological effort was needed to enter the strong coupling regime of single emitter cQED to study for instance the non-harmonicity of resulting Jaynes-Cummings ladder and to perform quantum non-demolition measurements at the …
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Classical and quantum nonlinear optics in confined photonic structures
… electromagnetic states in 3D photonic crystal microcavity structures is investigated for the first time. The spectrum of the squeezed light is theoretically calculated by using an open cavity quantum mechanical formalism. The cavity communicates with two main channels, which model vertical …
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