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 11 of 11 for “"polarization independent"”.
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Polarization independent microphotonic circuits
… require microphotonic circuits to be polarization independent, a requirement that is difficult to achieve with the high index contrast waveguides needed to form microphotonic devices. Chief among these microphotonic circuits is the optical add/drop multiplexer which requires …
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Polarization-independent Liquid Crystal Devices
… and other photonic devices. Most LC devices are 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 …
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Liquid Crystal Materials And Tunable Devices For Optical Communications
… properties characterized. Most LC devices are polarization sensitive. To overcome this drawback, we have investigated the polymer-stabilized cholesteric LC (PSCLC). Combining the curing temperature effect and high birefringence LC, a polarization independent fiber-optical device is realized …
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Fast Response Liquid Crystal Devices
… has several attractive features: 1) it is polarization independent, 2) it has gradient phase change, and 3) its response time is fast. It can be used for polarization converter and divergent LC lens. In addition, a new method for simultaneously measuring the phase retardation and optic axis …
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Tailoring Optical and Plasmon Resonances in Core-Shell and Core-Multishell Nanowires
… semiconductor shell under traverse electric (TE) polarization, semiconductor-metal-semiconductor CMS NWs can be designed to exhibit spectrally overlapping electric and magnetic resonances in the visible range. NWs exhibiting such double resonances can be considered as meta-atoms and arrayed to …
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Nonreciprocal effects and their applications in fiber optic networks
… because each light signal consists of four independent parameters, all of which changing during transmission. Fortunately, most optical signals can be classified into intensity-based and phase-based systems, and the Jones matrix technique is the ideal tool for describing the intensity-based …
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Integrated silicon photonic two-dimensional grating couplers
… there is a severe discrepancy between the polarization natures of both optical modes. While the external SMF supports a mode with two orthogonal, degenerated polarization states, the integrated Si waveguides and remaining components are mostly designed for the fundamental transverse …
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High Birefringence And Low Viscosity Liquid Crystals
… in this thesis is that we have developed a polarization independent phase modulator by using a negative dielectric anisotropic LC gel. With ~20 % of polymer mixed in the LC host, the LC forms polymer network which, in turn, exerts a strong anchoring force to the neighboring LC molecules. As …
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Detection and characterization of deep water wave breaking using moderate incidence angle microwave backscatter from the sea surface
… breaking events have been associated with polarization independent sea spikes in the RCS accompanied by increased mean frequency and bandwidth of the Doppler spectrum. Simultaneous microwave, video, and environmental measurements were made during the SAXON experiment off Chesapeake Bay in …
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Tunable Liquid Crystal Photonic Devices
… the polymer matrix, so that the devices are polarization independent and exhibit a fast response time. Because of the small droplet sizes, the operating voltage is higher than 100 Vrms. To lower the driving voltage, in Chap. 2 and Chap. 3, we have investigated a polymer-network liquid crystal …
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Reststrahlen band optics for the advancement of far-infrared optical architecture
… by choice of germanium thickness, and largely independent of polarization and angle of incidence. Subsequent heating of the devices demonstrated selective, tunable thermal emission Chapter 4 describes a different approach to achieving selective, tunable thermal emission; moreover, one that …