基于偶氮染料掺杂聚合物分散液晶薄膜的偏振无关全息光栅

Polarization-independent holographic gratings based on azo-dye-doped polymer-dispersed liquid-crystal films.

作者信息

Fuh Andy Ying-Guey, Chen Che-Chang, Cheng Ko-Ting, Liu Cheng-Kai, Chen Wei-Ko

机构信息

Department of Physics, National Cheng Kung University, Tainan 701, Taiwan.

出版信息

Appl Opt. 2010 Jan 10;49(2):275-80. doi: 10.1364/AO.49.000275.

DOI:10.1364/AO.49.000275

PMID:20062516

Abstract

We demonstrate polarization-independent holographic gratings (PIHGs) based on azo-dye-doped polymer-dispersed liquid crystal films. The PIHGs are recorded by irradiation under an intensity-modulated interference field, generated by two linearly polarized green optical beams, and by simultaneously applying a suitable AC voltage to the sample. The photoexcited azo dyes are adsorbed onto the UV-cured polymer film with their long axes parallel to the normal of the substrate. When the applied voltage is switched off, the PIHGs are generated with periodic modulation of liquid-crystal structures with transparently homeotropic and randomly scattered alignments. Additionally, the generated PIHGs can be completely switched off by an applied voltage.

摘要

我们展示了基于偶氮染料掺杂的聚合物分散液晶薄膜的偏振无关全息光栅（PIHG）。这些PIHG是在由两束线偏振绿色光束产生的强度调制干涉场照射下，并同时向样品施加合适的交流电压时记录的。光激发的偶氮染料以其长轴平行于基板法线的方式吸附在紫外固化聚合物薄膜上。当施加的电压关闭时，PIHG通过具有透明垂直排列和随机散射排列的液晶结构的周期性调制而产生。此外，通过施加电压可以完全关闭所产生的PIHG。