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 1491 for “"tunable"”.
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Tunable Liquid Crystal Photonic Devices
… optics, and optical communications due to their tunable optical properties. In this dissertation, we describe novel liquid crystal photonic devices and their fabrication methods. The devices presented include inhomogeneous polymer-dispersed liquid crystal (PDLC), polymer network liquid crystals …
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Silicon-based tunable optical filters
… characterization of a new class of silicon-based tunable optical filters. For this purpose a Fabry-Perot structure was chosen and implemented as a thin-film interference filter. The filter layers were configured as a self-supporting square membrane with side lengths of a few hundred microns. The …
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A voltage-tunable microfabricated accelerometer
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1992.
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Active and Fast Tunable Plasmonic Metamaterials
Active and Fast Tunable Plasmonic Metamaterials is a research development that has contributed to studying the interaction between light and matter, specifically focusing on the interaction between the electromagnetic field and free electrons in metals. This interaction can be stimulated by the …
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Monolithic In-Plane Tunable Optical Filter
… System (MEMS) monolithic in-plane tunable optical filter in both Indium Phosphide and Silicon. By placing one mirror of a waveguide-based Fabry-Perot interferometer on an electrostatically-actuated beam, a tunable filter is constructed. This is the first demonstration of a …
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Optically tunable external cavity ring laser
… and characterization 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 …
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Parallel file system with tunable consistency
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-15 without embargo terms
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Electrically tunable terahertz quantum cascade lasers
… systems (MEMS) assisted electrically tunable terahertz quantum cascade lasers (THz QCLs) are designed and demonstrated. Two MEMS tuner devices are proposed to achieve electrically tunable THz QCLs. One is the electrostatic comb drive actuated tuner design and the other one is a …
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Tunable wettability of microstructured polypyrrole films
This thesis presents the development of the conducting polymer polypyrrole as a viable material for applications requiring switchable wettability. A fabrication procedure that produces robust microstructured polypyrrole (PPy) that quickly and reversibly switches between the superhydrophobic and …
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Custom mechanisms for tunable material deposition
… ability to spin highly sophisticated and tunable material architectures, the aim of this thesis is to develop an enabling technology for digital fabrication requiring high levels of material tunability in product and architectural scales. Specifically, I designed, developed, built and …
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Electrospun nanofibers with tunable electrical conductivity
Electrospinning is a convenient method to produce nanofibers with controlled diameters on the order of tens to hundreds of nanometers. The resulting nonwoven fiber mats are lightweight, highly porous, and have high specific surface areas around 1 to 100 m2/g. Combined with the high electrical …
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Lumental : web-based tunable lighting control
… adjusting the light spectrum of spectrum-tunable light fixtures promises significant energy savings over binary or incremental dimming control. To enable this level of controllability, lighting must evolve from traditional physical interfaces towards autonomous systems that rely on …
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Topographically and Mechanically Tunable PNIPAM Scaffolds
Poly(N-isopropyl-acrylamide) (PNIPAM) is a thermoresponsive polymer with a wide range of biological applications, including drug delivery, biosensing, and tissue engineering. The tunability of the structural and mechanical properties of PNIPAM makes it particularly at- tractive in emulating cell …
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DEVELOPMENT OF MAGNETIC FABRICS WITH TUNABLE HYDROPHOBICITY
Polystyrene (PS) fiber mats incorporating iron (Fe) particles were fabricated by electrospinning and the hydrophobicity of the resulting magnetic fabrics was investigated with and without an applied magnetic field. The results show that the hydrophobicity (as measured using water droplet contact …
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Pivot point independent, external cavity tunable laser
… in to a novel pivot point free external cavity tunable laser (PPI ECTL). Existing external cavity tunable lasers are constructed using tunable optics, such as Bragg gratings to manipulate the cavity length. These elements although functional provide instability with prolonged use as they are …
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Highly tunable room temperature quantum cascade lasers
An investigation was conducted into the feasibility of novel Quantum Cascade Laser (QCL) technology to replace Optical Parametric Oscillator based light sources in real-time video-rate gas imaging systems. Such a laser must produce pulses of >5ns in duration at a repetition rate of at least 5kHz …
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Novel semiconductor based broadly tunable light sources
… of novel semiconductor based laser sources tunable in the broad spectral ranges which are unattainable for conventional lasers due to a lack of suitable laser gain materials. In the first part of the thesis the subject matter is concerned with the direct emission from laser devices. In …
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