Journal
OPTICAL MATERIALS EXPRESS
Volume 2, Issue 12, Pages 1791-1796Publisher
OPTICAL SOC AMER
DOI: 10.1364/OME.2.001791
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This study is the first to investigate an optically addressed, electrically tunable prism grating based on homogeneously aligned liquid crystals (LCs) with a photoconductive layer. A conductivity-gradient electrode-like grating pattern of the polymer layer results in a spatially periodic gradient of the effective electric-field drop, producing a prism grating with a spatially periodic LC gradient reorientation. The asymmetric diffraction pattern can be adjusted by varying the dc voltage. The first-order diffraction efficiency is 64% at optimal conditions. The proposed prism grating exhibits extremely low diffraction noise in the off state, a high switching contrast in the on-off state (similar to 1000), simplicity of fabrication, and high controllability at a low voltage range (0 to 0.4 V/mu m). (C)2012 Optical Society of America
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