Optical switch of diffractive light from a BCT photonic crystal based on HPDLC doped with azo component |
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Authors: | Shian Li Ming Fuh Andy Ying-Guey Wu Shing-Trong |
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Institution: | Department of Physics, National Cheng Kung University, Tainan 701, Taiwan. |
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Abstract: | This study demonstrates an optical switch of the diffractive light from a body-centered tetragonal photonic crystal based on holographic polymer-dispersed liquid crystals that are fabricated using two-beam interference with multiple exposures. The liquid crystal-rich regions form the lattice points of the PC, which contains a liquid crystal/azo-dye mixture. The concentration of the cis isomer changes under laser light exposure; this change, in turn, modulates the effective index of the LCs, and then switches diffractive light. |
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