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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 39 for “"polarizer"”.
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In-line Fiber Polarizer
Polarizers and polarization devices are important components in fiber optic communication and sensor systems. There is a growing need for efficient low loss components that are compatible with optical fibers. An all fiber in-line polarizer is a more desirable alternative that could be placed at …
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High Extinction Ratio Subwavelength 1D Infrared Polarizer by Nanoimprint Lithography
Infrared (IR) polarizers have been widely used in military and commercial applications. Controlling the polarization of incident light is one of major issues in the detector systems. However, conventional polarimetric IR detectors require series of polarizers and optical components, which increase …
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Design of Submicron Structured Guided-Mode-Resonance Near-Infrared Polarizer
… research is to design a larger submicron linear polarizer in the near-infrared wavelength range with a wide bandwidth which can be fabricated using the conventional thin-film microfabrication technology to reduce cost. For this purpose, a gold (Au) wire-grid transmission-type transverse-magnetic …
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Process modifications for improved optical characteristics of K-type polarizer
Synthetic sheet polarizers have a wide range of purposes, primarily in liquid crystal displays (LCD), in particular those with anti-glare and contrast-enhancing applications. Current polarizers do not perform to their full potential due to "leakage" in the red and blue parts of the spectrum, where …
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Theoretical and experimental studies of the ITER ECRH polarizer and rotator gratings
… fusion experiment. A pair of reflection grating polarizers will be used in the ECRH high power microwave transmission lines to generate the required elliptically polarized microwave beam for ideal plasma coupling. A 'polarization rotator' and a 'circular polarizer' are used together to convert a …
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Mode-matching analysis for discontinuities in waveguide and application to a waveguide circular polarizer
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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An Analysis of W-fibers and W-type Fiber Polarizers
… devices. Under consideration here is the fiber polarizer. The fiber polarizer produces an output that is linearly polarized along one of the fiber's principal axes. Some of the polarizer properties can be understood from the study of W-fibers.
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Application of surface thermal lens technology combined with polarization to the study of polymers
… the STL probe beam was polarized. Two different polarizer orientations for the probe beam, crossed and parallel, were used to observe the STL signal response to the samples. No time dependence in the STL signals of both Zeonex and acrylic was observed when the probe beam was unpolarized, but time …
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Wide Viewing Angle Liquid Crystal Displays
… liquid crystal displays utilizing crossed linear polarizers is proposed. The designed multi-domain vertical-alignment liquid crystal display predicts superb contrast ratio over wide viewing angles. Next, to increase the bright state transmittance while maintain the high contrast. Finally, to …
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Hyperpolarized xenon-129 production and applications
… to present a novel design of a large-scale SEOP polarizer for producing large quantities of highly polarized 129Xe. High Rb-Xe spin-exchange rates through long-lived van de Waals molecules at low total pressure, implemented in a novel counterflow polarizer design, resulted in xenon polarization …
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Studying phonon mean free paths at the nanoscale : modeling and experiments
… thermal transport using wire grid linear polarizer in conjunction with time-domain thermoreflectance (TDTR) pump-and-probe measurement setup. Consistent algorithm based on solution from the phonon Boltzmann transport equation (BTE) is also developed to approximately extract the thermal …
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Microbending effects in singlemode optical fibers: investigation and novel applications
… the above analysis, a wavelength-tunable fiber polarizer is proposed and demonstrated. The polarizer is fabricated by inducing a periodic perturbation on a high birefringence singlemode optical fiber. The fiber thus exhibits polarization· selective attenuation characteristics. The operating …
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Analysis of radiation mechanism and polarizing properties of metamaterials
… light (transmittance) through a pair of crossed-polarizers, and 2. Fresnel coefficients of a single polarizer. The expressions for the transmittance and the Fresnel coefficients are obtained analytically using the kDB method. A novel procedure to determine the angles of transmission of the …
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Hyperpolarized Carbon-13 Magnetic Resonance Measurements of Tissue Perfusion and Metabolism
… moment. This polarization is created in a polarizer separate from the imaging magnet, and decays continuously towards a non-detectable thermal equilibrium once the imaging agent is removed from the polarizer and administered by intravenous injection. Specialized imaging strategies are …
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Integrated spot size converters for InP based photonic systems
… in a single approximately 372 μm long TM- pass polarizer. A TE-pass polarizer with a similar length was demonstrated with a TM/TE-power extinction ratio of (0.7 ± 0.2) dB at 1610 nm. The refractive indices of two different InGaAsP compositions, required for a SSC, are measured by the reflection …
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Polarization-independent Liquid Crystal Devices
… polarization dependent and require at least one polarizer. As a result, the optical efficiency is low. To enhance display brightness, a power hungry backlight has to be used leading to a high power consumption and short battery life. In a LC phase modulator, the polarization dependent property …
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High-Resolution Low-Noise Polarization Imaging Sensor for Astronomical Applications
… of a CCD imager overlaid with a nanowire linear polarizer filter array of four different orientations: 0°, 45°, 90°, and 135°) matched to the pixel pitch. Fabrication details and experimental setup for characterization are discussed. The performance of the sensor is assessed over a range of …
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Crosstalk and noise in division-of-focal-plane polarimeters and polarization imaging applications
… by integrating a pixelated microgrid polarizer array directly onto an image sensor. Recent advances in complementary metal oxide semiconductor (CMOS) technology have led to sensors with pixel sizes on the order of a micron, which greatly increases spatial crosstalk. This work develops …
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POLARIZATION ABERRATIONS
… of radially symmetric systems of weak polarizers, systems like lenses, telescopes and microscopes. The instrumental polarization in these systems arises from weak polarization effects occurring near normal incidence at glass, metal and thin film coated interfaces. Polarized light and …
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Determination of Mueller matrix elements in the presence of imperfections in optical components
The Polarizer-Sample-Analyzer (PSA) arrangement with the optical components P and A rotating with a fixed speed ratio (3:1) was originally introduced to determine nine Mueller matrix elements from Fourier analysis of the output signal of a photodetector. The arrangement is modified to the P'PSAA' …
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