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  • Title: Liquid crystal gratings based on alternate TN and PA photoalignment.
    Author: Hu W, Srivastava A, Xu F, Sun JT, Lin XW, Cui HQ, Chigrinov V, Lu YQ.
    Journal: Opt Express; 2012 Feb 27; 20(5):5384-91. PubMed ID: 22418345.
    Abstract:
    A diffraction grating is proposed by periodically defining the liquid-crystal director distribution to form alternate parallel aligned and twist nematic regions in a cell placed between two crossed polarizers. Based on the combined phase and amplitude modulation, both 1D and 2D tunable gratings are demonstrated. Low voltage ON/OFF switching of 1st order diffracted light with extinction ratio over 80 is achieved within a small voltage interval of 0.15 Vrms. Unique four-state feature of the cell is obtained and their applications in optical logic devices are discussed.
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