Enhanced Photorefractivity from Ion-Doped Polymer-Dispersed Liquid Crystals
Enhanced Photorefractivity from Ion-Doped Polymer-Dispersed Liquid Crystals
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DOI：
10.1021/jp047302y
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发表时间：
2004-09
影响因子：
3.3
通讯作者：
Jeffrey E. Hall and;D. Higgins
中科院分区：
文献类型：
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作者：
Jeffrey E. Hall and;D. Higgins
利用动态近场扫描光学显微镜（NSOM）和非对称双光束耦合实验，对光折变聚合物分散液晶（PDLC）薄膜进行了研究。从掺杂有二萘嵌苯（充当光激发电子供体）和N，N '-二辛基-1，4，5，8-萘二酰亚胺（NDI）（电子受体）的膜获得的结果进行比较，从也被掺杂有四丁基铵四氟硼酸盐（TBATFB）的膜获得的那些。动态NSOM和双光束耦合的结果提供了明确的证据，在薄膜中掺杂永久离子，如TBATFB增强的光致发光活性。NSOM结果的计算机模拟提供了支持证据，也提供了有价值的信息，这种增强的起源。它的结论是，增强的光学响应产生的非线性依赖的液晶取向状态上的电场在单个液晶液滴，因此，这两个永久的浓度和…
Dynamic near-field scanning optical microscopy (NSOM) and asymmetric two-beam coupling experiments are performed on thin films of photorefractive polymer-dispersed liquid crystals (PDLCs). Results obtained from films doped with perylene (serving as the photoexcitable electron donor) and N,N‘-dioctyl-1,4,5,8-naphthalene diimide (NDI) (the electron acceptor) are compared to those obtained from films that have also been doped with tetrabutylammonium tetrafluoroborate (TBATFB). Both the dynamic NSOM and two-beam coupling results provide clear evidence for enhanced photorefractivity in films doped with permanent ions such as TBATFB. Computer simulations of the NSOM results lend supporting evidence and also provide valuable information on the origins of this enhancement. It is concluded that the enhanced optical response arises from the nonlinear dependence of the liquid crystal orientation state on the electric fields within individual liquid crystal droplets and, hence, the concentrations of both permanent an...