Dynamic studies of holographic gratings in dye-doped liquid-crystal films

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作者：
机构：
[1] Fuh, Andy Y.-G.
[2] Liao, C.-C.
[3] Hsu, K.-C.
[4] Lu, C.-L.
[5] Tsai, C.-Y.
来源：
Fuh, A.Y.-G. (andyfuh@mail.ncku.edu.tw) | 1767年 / Optical Society of America (OSA)卷 / 26期
关键词：
Doping (additives) - Dyes - Electric potential - Holography - Liquid crystals - Optical films - Photorefractive materials;
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摘要：
The dynamic behavior of a holographic grating induced in a homeotropically aligned dye-doped liquid-crystal film is investigated. In the presence of an applied dc voltage, photoexcited azo dyes induce a photorefractive grating and then diffuse and are adsorbed onto cell substrates. The reorientation of liquid crystals as a result of adsorbed dyes leads to a phase grating that is phase shifted 90° from the photorefractive grating. Competition of these two gratings induces two-beam coupling of the writing beams, initially transferring energy from beam 1 to beam 2 and then, after a pause, from beam 2 to beam 1. © 2001 Optical Society of America.
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