Phase Controlled Laser Interference for Tunable Phase Gratings in Dye-Doped Nematic Liquid Crystals
LI Ming1, ZHANG Pei-Qing1, GUO Jing1, XIE Xiang-Sheng1, LIU Yi-Kun1, LIANG-Bing1, ZHOU Jian-Ying1, XIANG Ying2
1State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou 5102752School of Information Engineering, Guangdong University of Technology, Guangzhou 510006
Phase Controlled Laser Interference for Tunable Phase Gratings in Dye-Doped Nematic Liquid Crystals
LI Ming1;ZHANG Pei-Qing1;GUO Jing1;XIE Xiang-Sheng1;LIU Yi-Kun1;LIANG-Bing1;ZHOU Jian-Ying1;XIANG Ying2
1State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou 5102752School of Information Engineering, Guangdong University of Technology, Guangzhou 510006
摘要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.
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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2008, Vol. 25 
