Enhancement of Photorefractivity in the Isotropic Phase of Polymer Liquid Crystals
Enhancement of Photorefractivity in the Isotropic Phase of Polymer Liquid Crystals
复制标题
聚合物液晶各向同性相光折变性的增强
DOI：
10.1021/jp983661f
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
Takeshi Yoshimi
中科院分区：
文献类型：
--
作者：
T. Sasaki;Masatomo Goto;Y. Ishikawa;Takeshi Yoshimi
使用双光束耦合实验研究了一系列具有 4-硝基亚苄基苯胺部分或氰基联苯部分作为介晶并同时作为非线性光学发色团的聚合物液晶的光折变性。在与电荷传输化合物混合的聚合物液晶的各向同性相中，在施加37V/Im的外部电场时获得了65%的大衍射效率( )。比较液晶聚合物和非晶聚合物之间的光折变性。发现与具有几乎相同分子结构的无定形聚合物相比，液晶聚合物的各向同性相的光折变性显着增强。
The photorefractivity of a series of polymer liquid crystals that possess a 4-nitrobenzylideneaniline moiety or a cyanobiphenyl moiety as a mesogen and simultaneously as a nonlinear optical chromophore was investigated using two-beam coupling experiments. A large diffraction efficiency ( ) of 65% under application of a 37 V/Im external electric field was obtained in the isotropic phase of a polymer liquid crystal mixed with charge transporting compounds. The photorefractivity was compared between the liquid crystalline polymers and amorphous polymers. The photorefractivity was found to be significantly enhanced in the isotropic phase of the liquid crystalline polymers compared to that of the amorphous polymers with almost the same molecular structure.