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 97 for “"Optical elements"”.
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Holographic optical elements for holographic stereogram printers
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Architecture, 1991.
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Design and Application of Waveguide Holographic Optical Elements
… construction beams. Compared to the traditional optical systems, a holographic optical element (HOE) has the properties: formation in thin, lightweight films that can be deposited on various substrates; high diffraction efficiency, high transparency, low scatter, the ability to multiplex multiple …
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MICROSCOPIC SURFACE ELECTROCHEMICAL ACTUATORS FOR VOLTAGE-TUNABLE OPTICAL ELEMENTS
Voltage controllable optical resonators (VCOR) are critical to the world of photonics, theyallow dynamic tuning of the amplitude and phase of light via electric modulation of two semi reflective plates. Here, I present a novel application of a voltage-driven micro actuator technology, the surface …
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Fabrication of anti-reflective and imaging nanostructured optical elements
Moth eyes minimize reflection over a broad band of angles and colors and lotus leaves minimize wetting over a broad range of breakthrough pressures by virtue of subwavelength structures patterned on their respective surfaces; similar examples of organisms exploiting geometry to attain properties …
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An Investigation into full color Edge-lit Holographic Optical Elements
… spectrally selective HOE's (holographic optical elements) in silver halide and photopolymer materials create diffraction structures that have significant impact on effective recording performance. Typical off-axis holographic recording regimes as well as holographic directional diffusers …
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Monolithic Integration Of Dual Optical Elements On High Power Semicond
… investigates the monolithic integration of dual optical elements on high power semiconductor lasers for emission around 980nm wavelength. In the proposed configuration, light is coupled out of the AlGaAs/GaAs waveguide by a low reflectivity grating coupler towards the substrate where a second …
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Block copolymer photonic crystals : towards self-assembled active optical elements
… work has been achieved yet in terms of realizing optically active devices using these materials. [n this thesis, the utilization of block copolymer photonic crystals for creating self-assembled active optical elements has been experimentally explored with a special emphasis on optically driven …
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Integrated diffractive optical elements for terahertz beam shaping and polarization control /
… and optimization of integrated diffractive optical elements (DOEs) for efficient beam focusing, polarization control and enhanced transparency in the terahertz (THz) frequency range (0.1–1 THz). Utilizing semiconductor- and metal-based elements, the research introduces hybrid multi-phase …
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Design And Optimization Of Nano-optical Elements By Coupling Fabrication To Optical Behavior
… technologies. To this day, fabrication and optical behavior remain decoupled during the design phase and numerous assumptions are made about "perfect" geometry. As research moves from theory to real devices, predicting device behavior based on realistic geometry becomes critical. In this …
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SCRIBE: Subsurface volumetric integration of freeform micro-optical elements for advanced beam shaping and light routing
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-05-01
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Additive Lithography Fabrication And Integration Of Micro Optics
Optical elements are the fundamental components in photonic systems and are used to transform an input optical beam into a desired beam profile or to couple the input beam into waveguides, fibers, or other optical systems or devices. Macroscopic optical elements are easily fabricated using grinding …
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Phase optimised general error diffusion for diffractive optical component design
Algorithms for developing Diffractive Optical Elements (DOEs) are improved to achieve real time holograms capable of switching at rates of 25frames/second or greater. A Phase Optimised General Error Diffusion (POGED) algorithm optimised for quality and speed of generation of diffractive elements is …
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Bio-inspired optical components
… is fundamental to improving and extending optical science and engineering as well as producing novel optical elements. Improvement in this understanding should not only include work to understand the interaction with traditional engineering materials but also should target the understanding …
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Holographic correction of aberrated telescopes / by Geoff Andersen.
… holographic correction of aberrations in large optical elements.
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Metrology and mechanics for manufacturing space-based x-ray grating spectrometers
… in critical dimensions (CDs) or deformation of optical components can lead to severe performance degradation in high-resolution imaging and spectroscopy tools. Consistent innovations towards more precise optical elements and assembly procedures have led to high-resolution optical systems in many …
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Realization of a 3D gradient index medium in porous silicon
… of photonic and gradient refractive index (GRIN) optical elements. After a porosity-dependent index profile is etched into the PSi element, the optical response can be further modified by introducing secondary materials into the void volume of the mesoporous structure, thereby changing the filled …
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