Phase Controlled Laser Interference for Tunable Phase Gratings in Dye-Doped Nematic Liquid Crystals |
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Authors: | LI Ming ZHANG Pei-Qing GUO Jing XIE Xiang-Sheng LIU Yi-Kun LIANG-Bing ZHOU Jian-Ying XIANG Ying |
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Institution: | State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou 510275School of Information Engineering, Guangdong University of Technology, Guangzhou 510006 |
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Abstract: | A phase controlled multi-beam interference is applied to excite the doped liquid crystals. Control of the phase difference between the exciting beams allows the external control of the interference pattern inside the liquid crystal. The dynamic variation of the grating is made possible with a time-dependent phase change to derive the nonlinear refractive index as well as the responding speed of the material. The induced grating structure is numerically modelled with reorientational phase gratings in the liquid crystal, and the diffraction dynamics is found to be in good agreement between theoretical and experimental results. |
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Keywords: | 42 40 Eq 42 40 Lx 42 70 Df |
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