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 15 of 15 for “"Cavity Resonance"”.
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Effect of an aeroelastic film on confined subsonic cavity resonance
… OF AN AEROELASTIC FILM ON CONFINED SUBSONIC CAVITY RESONANCE by Melissa Carter B.S., Mechanical Engineering, University of New Mexico, 2001 M.S., Mechanical Engineering, University of New Mexico, 2011 ABSTRACT Two shallow three-dimensional cavities were used to study the effect on cavity …
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A layered model approach to the Earth-ionosphere cavity resonance problem
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology, 1963.
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A Coupled Tire Structure-Acoustic Cavity Model
… shown that the vibration induced by the tire air cavity resonance is transmitted into the vehicle cabin and may be responsible for significant interior noise. The tire acoustic cavity is excited by the road surface through the contact patch on the rotating tire. The effect of the cavity resonance …
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Design of Submicron Structured Guided-Mode-Resonance Near-Infrared Polarizer
… polarizer, were designed using the guided-mode-resonance filter. The Au wire-grid TM polarizer of 700nm grating width and 1200nm grating period has 95% transmittance at 2400nm, more than 1000nm resonance peak bandwidth, and an extinction ratio (ER) of around 300 with a moderated level of …
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Light and Single-molecule Coupling in Plasmonic Nanogaps
… two metallic surfaces which creates an optical resonance. This optical resonance of the system is controlled by the geometry and the material of the nanogap. The focus of this work is to understand and utilize these confined optical modes to probe and manipulate the dynamics of single-molecules …
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Resonant Detection of Nano to Microscopic Objects Using Whispering Gallery Modes
… thousand times and thus creates an optical resonance. The unprecedented narrow linewidth of such a microsphere resonance (Q factors of up to 3x10⁹) allows precise measurement of its frequency. Dielectric microspheres of very high Q are thus the ideal choice for a resonant molecular sensor. …
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Multimaterial acoustic fibers
… of the light reflected from the Fabry-Perot cavity is demonstrated through electric field induced tuning of the cavity resonance.
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Analysis of the pressure-wall interaction at the release of a stop closure
… a 50-Hz-wide frequency band containing the front cavity resonance for the signal in every 5 milliseconds (a moving 5-ms window). This measure is found applicable to 25 releases out of 32 releases from TIMIT database. The means of the collected durations are found closest to the estimated duration …
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A study of active control techniques for noise reduction in an aircraft fuselage model
… reductions for harmonic excitation at acoustic cavity resonance are shown to be in excess of 20 dB throughout most of the cavity whether synchrophasing or active vibration control is used. Off-resonance reductions are substantially less due to increased modal density requiring a larger number of …
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Vertical cavity surface emitting lasers.
Vertical cavity surface emitting laser (VCSEL) structures have been grown by both metal-organic chemical vapour deposition (MOCVD) and molecular beam epitaxy (MBE). These incorporate 3 strained InGaAs / GaAs quantum wells placed resonantly in a two wavelength long optical cavity, formed between …
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Intracavity coherent interaction of mode-locked pulse train with resonant medium
… of a mode-locked pulse train with intracavity samples, namely rubidium-87 (Rb-87) vapor and Fabry-Perot etalon, placed inside a laser cavity are studied in the light of developing ultra-sensitive laser sensors to measure a small magnetic field and a minute change of index of refraction …
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Coherent optical nonlinearities in semiconductor microstructures
… transition the direction of the shift of the resonance depends on the polarization of the pump and probe pulses. In particular, for anti-circular polarization a surprising red-shift is observed. For resonant excitation, induced absorption energetically above and below the exciton transition …
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Dynamic holography in semiconductors and biomedical optics
… quantum-well microcavities is a tuned low-Q cavity resonance that supports wide angle-of-view while operating on the edge of stimulated light emission. A diffraction efficiency of 70% has been obtained using a phase-grating contribution that approaches the maximum π phase shift. The …
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One-dimensional photonic crystal / photonic wire cavities based on silicon-on-insulator (SOI)
… Two PhC hole mirrors were separated with a cavity spacer varying from 400 nm to 500 nm in length to form a micro-cavity. In contrast, several different cavity arrangements were also successfully investigated, - i.e. extended cavity and coupled micro-cavity structures. The experimental …
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Flameholding methods for compact hypersonic systems
… assess their performance in combination with a cavity flameholder. It was observed that the hypermixer geometries enhanced fuel-air mixing and flameholding through turbulent flame production as well as an enhancement of cavity activity, and were suited for establishment of ram-mode combustion. …