Optically switchable gratings based on polymer-dispersed liquid crystal films doped with a guest-host dye

A. Ying-Guey Fuh, M. Tsai, T. Liu, Li-Jue Huang
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引用次数: 4

Abstract

In this work, we add a small amount of a guest-host dye G-206 in the polymer-dispersed liquid crystal (PDLC) mixtures to fabricate holographic gratings. Following formation, the grating is irradiated by a single Ar/sup +/ laser beam while probed by a He-Ne laser. Experimental results indicate that the first-order diffracted intensity of the probe beam significantly increases. Such an optically switchable diffraction effect is attributed to thermal expansion. The G-206 dye absorbs Ar/sup +/ laser, subsequently resulting in thermal expansion. The liquid crystal (LC) droplets are then squeezed so that the LC molecules within the droplets are reoriented collectively. Thus, the refractive index difference between the LC-rich and polymer-rich stripes, /spl Delta/n, increases.
掺杂主客体染料的聚合物分散液晶薄膜的光学可切换光栅
在这项工作中,我们在聚合物分散液晶(PDLC)混合物中加入少量的主客体染料G-206来制作全息光栅。形成后,光栅被单Ar/sup +/激光束照射,同时被He-Ne激光器探测。实验结果表明,探针束的一阶衍射强度显著提高。这种光学可切换的衍射效应归因于热膨胀。G-206染料吸收Ar/sup +/激光,随后产生热膨胀。液晶(LC)液滴然后被挤压,使液滴内的LC分子集体重新定向。因此,富lc条纹和富聚合物条纹之间的折射率差/spl δ /n增大。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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