Polarization holographic grating based on azo-dye-doped polymer-ball-type polymer-dispersed liquid crystals
Polarization holographic grating based on azo-dye-doped polymer-ball-type polymer-dispersed liquid crystals
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基于偶氮染料掺杂聚合物球型聚合物分散液晶的偏振全息光栅
DOI：
10.1364/josab.19.002590
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发表时间：
2002
影响因子：
1.9
通讯作者：
T. Mo
中科院分区：
文献类型：
--
作者：
A. Fuh;Chia‐Rong Lee;T. Mo
研究了偶氮染料掺杂聚合物球型聚合物分散液晶薄膜的偏振光栅。写入光束是两个相互正交（s偏振和p偏振）的偏振光束。PG是由于液晶分子与吸附在聚合物球表面上的染料分子相互作用而发生分子重新取向的结果。在偏光显微镜下用十字检偏器研究了衍射光束的偏振特性和光栅图样。结果表明，光栅将线偏振光衍射成各种偏振态的光束。因此，根据入射光的偏振，光栅可以用作非偏振或偏振分束器。基于琼斯矩阵方法的模型，它很好地符合实验结果。
A polarization grating (PG) written in an azo-dye-doped film of polymer-ball-type polymer-dispersed liquid crystals was investigated. The writing beams were two mutually orthogonal (s- and p-polarized) polarized beams. The PG resulted from molecular reorientation of the liquid crystals as a result of their interaction with the dye molecules adsorbed on the surface of the polymer balls. Polarization characteristics of the diffracted beams and the grating pattern were studied under a polarizing optical microscope with a crossed analyzer. The results indicate that the PG diffracts the linearly polarized incident light into beams with various polarizations. Accordingly, the grating can be used as an unpolarized or a polarized beam splitter, depending on the polarization of the incident light. A model based on the Jones matrix approach was developed, and it closely fits the experimental results.