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 “"High Birefringence"”.
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High Birefringence And Low Viscosity Liquid Crystals
… anisotropic LCs, we have developed some high birefringence isothiocyanato tolane LC compounds with birefringence ~0.4, and super high birefringence isothiocyanato biphenyl-bistolane LC compounds with birefringence as high as ~0.7. Moreover, we have studied the photostability of several …
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Liquid Crystal Materials And Tunable Devices For Optical Communications
… temperatures are investigated experimentally. At high curing temperature, a high contrast, low drive voltage, and small hysteresis PNLC is obtained as a result of the formed large LC micro-domains. With the help of curing temperature effect, it is able to develop PNLC based optical devices with …
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Designs for Zero Polarization-Mode Dispersion And Polarization-Maintaining Fibers
… are presented. First, optimum designs for high-birefringence as well as single-polarization single-mode fibers are studied. For high-birefringence fibers, several index profiles were obtained that provided high birefringence while achieving zero or very small dispersion in 1.3 μm and 1.55 …
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Experimental and theoretical analysis of polarization-maintaining fibre for sensing applications
… for a range of industrial applications. High-birefringence (Hi-Bi) optical fibres represent an important type of specialist fibres that have been explored widely by researchers. The focus of this thesis is to explore their potential for different sensing applications as the birefringence …
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Uniaxial optical phase change metamaterials
… as a model phase change material due to its high reflectance contrast between states, fast switching speeds, and high metastability. Here, we theoretically investigate the reflectance and form birefringence of GST-based optical metamaterials. These optical properties are simulated on the …
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Surface properties of poly(bisphenol-A-carbonate)
… for the thinning process. <br></br><br></br>A high degree of molecular orientation and residual stress (a major reason for premature mechanical failure) was primarily attributed to cold moulding and poor mould design coupled with inadequate testing of, the finished product. The high …
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Interrogation of fibre optic sensors
… realised. Special single mode fibre, namely, high-birefringence fibre has been employed to implement a dual-beam interrogating interferometer. The first interrogation scheme is based on an optical channel monitor, which is an arrayed waveguide grating with integral photo-detectors providing a …
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Microbending effects in singlemode optical fibers: investigation and novel applications
… by inducing a periodic perturbation on a high birefringence singlemode optical fiber. The fiber thus exhibits polarization· selective attenuation characteristics. The operating wavelength is shown to be tunable by changing the spatial period of the defonnation. A polarization extinction …
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Holey optical fibres for high nonlinearity devices
… of HF technology in the implementation of highly nonlinear optical devices, as well as showing its limitations. The initial fabrication problems that hindered the production of HFs with a high nonlinearity are identified and several strategies are adopted for its solution, including an …
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Exploitation of fibre characteristics in temperature sensing and radio-over-fibre applications
… as their wavelength multiplexing capability and high sensitivity to temperature, pressure, strain, vibration and acoustic emission. Moreover, optical fibre sensors are more attractive than the electronics sensors as they can perform distributed sensing, in terms of covering a reasonably large …
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Fibre-based devices for next generation photonics communication systems
… Special single-mode fibres, namely, the high birefringence (Hi-Bi) fibre and the Er/Yb doped fibre have been employed so as to exploit their merits to achieve practical and cost-effective all-fibre architectures. A number of fibre-based complex signal processors for optical and radio …