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Browsing by Author "Chen, Tai An"

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    Tunable Fresnel lens using surface modification of vertical-aligned liquid crystals
    (2010)
    Lin, Kuo Ren
    ;
    Jeng, Shie Chang
    ;
    Chen, Tai An
    ;
    Hwang, Shug June
    ;
    影像與生醫光電研究所
    A simple method to make a switchable liquid crystal Fresnel lens with high diffraction efficiency and a low driving voltage was proposed by photo-induced surface modification of vertical alignment layer. Remarkable diffraction efficiency close to the theoretical limit was detected and demonstrated to depend sensitively on the applied voltage.