Studies of Optically Controllable Fresnel Lenses in Azobenzene-Doped Liquid Crystals
| Autor: | Yi-Chieh Kuo, 郭怡傑 |
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| Rok vydání: | 2011 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 99 This study demonstrates tunable Fresnel lenses in an azo-dye-doped liquid crystal (ADDLC) film and an azo-liquid-crystal-doped cholesteric liquid crystal (ADCLC) film using an interference technique. One Fresnel-patterned green beam using a Sagnac interferometer irradiated the UV-illuminated ADDLC cell, yielding a concentric zone plate distribution with homeotropic and isotropic structures in bright and dark regions of the green interference pattern. The ADDLC Fresnel lens is polarization independent, focus tunable, and the focusing efficiency of the device can be optically controlled. One Fresnel-patterned green beam using a Sagnac interferometer irradiated the UV-illuminated ADCLC cell, yielding a concentric zone plate distribution with planer and scattering structures in bright and dark regions of the green interference pattern. The ADCLC Fresnel lens is simultaneously transmissive and reflective, and the focusing efficiency of the device can be optically controlled. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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