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  • Title: Electrically switchable liquid crystal Fresnel lens using UV-modified alignment film.
    Author: Jeng SC, Hwang SJ, Horng JS, Lin KR.
    Journal: Opt Express; 2010 Dec 06; 18(25):26325-31. PubMed ID: 21164982.
    Abstract:
    A simple method to make a switchable liquid crystal (LC) Fresnel lens with high diffraction efficiency and a low driving voltage was proposed based on the photo-induced surface modification of the vertical alignment layer. UV illumination alters the pretilt angle of alignment layers, a Fresnel zone-distribution hybrid alignment in the homeotropic LC cell can be straightforwardly achieved through UV exposure, yielding a concentric structure of the Fresnel phase LC lens. A remarkable diffraction efficiency of ~31.4%, close to the measured diffraction efficiency of the used Fresnel-zone-plate mask of 32%, was detected using a linearly polarized incident beam.
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