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 2023 for “"cavity"”.
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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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Oscillatory Flow Driven by Cavity
<p>Flows past a cavity are known to exhibit an oscillatory behavior with an amplitude and frequency dependent on the incoming flow properties and the geometry of the cavity. Experiments and numerical analyses have been performed to determine the effects of a flow passing through an axisymmetric …
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Renormalization of cavity field theories
… diagrams in field theories, confined to a cavity, has always been the divergent loop diagrams. So far, only the quantum chromodynamic and electrodynamic self-energies of a ls1/2 quark, confined to a static spherical cavity, have been accurately calculated. These quantities are of immediate …
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Nonlinear Cavity Optomechanics in Diamond
… that consists of spins, photons, and phonons. Cavity optomechanics provides a platform to increase the interaction time between photons and phonons. By increasing the average number of photons and phonons, the coupling rates will be enhanced, and better control over the system could emerge as a …
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Metal-cavity surface-emitting nanolasers
Metal-cavity surface-emitting micro/nanolasers are proposed and demonstrated. The design uses metals as both the cavity sidewall and the top/bottom reflectors and maintains the surface-emitting nature. As a result of the large permittivity contrast between the dielectric and metal, the optical …
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Cavity modified atom-photon interaction
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1989.
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Progress towards cavity induced transparency
… electromagnetically induced transparency (EIT), cavity induced transparency (CIT) uses a cavity rather than a laser to couple a ground state with the excited state of a three-level system. In this thesis, I discuss the theory behind CIT and present the progress in our current experiment aimed at …
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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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Evanescently Coupled Vertical Cavity Laser Arrays
… optical coupling between elements in vertical cavity surface emitting laser (VCSEL) arrays is interesting for applications in areas such as optical communications, image processing, and electronic beam-steering. Past work in coherently coupled VCSEL arrays has resulted in out-of-phase arrays or …
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Dielectric micro-cavity surface-emitting lasers
In recent years, various metal-cavity nano-lasers have been theoretically studied and experimentally realized because it is believed that their small sizes can actually bring large potential in the next-generation dense photonic integration and optical interconnects. However, the absorption loss in …
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Coherently-coupled vertical-cavity laser arrays
Coherently-coupled vertical cavity surface-emitting laser (VCSEL) arrays offer a unique approach to beam steering and high-radiance applications, and have many advantages such as small size, low cost, high speed, durability and manufacturing ease. Previous work on coherently-coupled VCSEL arrays …
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External cavity laser label-free biosensor
… resonant reflector as a mirror of an external cavity laser, we demonstrate a new type of label-free optical biosensor that achieves a high quality factor through the process of stimulated emission, while at the same time providing high sensitivity, large dynamic range and simple detection …
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Optically tunable external cavity ring laser
… of a novel optically tunable external cavity ring laser is described here. The external cavity laser (ECL) utilizes a semiconductor optical amplifier as the gain medium in a ring configuration, and a surface photonic crystal incorporating a superstrate layer of an azobenzene solution as …
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Cavity-backed T-fed slot antenna
Cavity-backed slot antennas are experiencing a revival because of the ever-increasing need for low-profile and conformal antennas which have a low radar cross section out of their operating frequency bands. Like thin microstrip patch antennas, cavity-backed slot antennas typically have a narrow …
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Perturbative quantum chromodynamics in a cavity
… is quantized in a static spherical cavity, subject to the boundary conditions of the MIT group. Using the Gell-Mann and Low theorem and a modified version of Goldstones theorem we formulate perturbation theory. In 4th order perturbation theory we calculate the Feynman diagrams …
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Broadbanding of a klystron output cavity
Thesis (Elec.E)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1960.
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Quantum electrodynamics in a damped cavity
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1982.
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