Semkin Artem, Sharangovich Sergey
Department of Microwave and Quantum Radio Engineering, Tomsk State University of Control Systems and Radioelectronics, 634050, Tomsk, Russia.
Polymers (Basel). 2019 May 11;11(5):861. doi: 10.3390/polym11050861.
In this work, the theoretical model of non-uniform diffraction structures' holographic formation in liquid crystal-photopolymer (LC-PPM) composite materials with a dye-sensitizer is developed. The model takes into account the arbitrary character of amplitude and phase spatial distributions of recording light field, its arbitrary polarization state and also a non-linearity of the recording process. Two the most common types of liquid crystal-photopolymer composite are investigated: Holographic polymer-dispersed liquid crystals (H-PDLC) and polymer-stabilized liquid crystals (PSLC). Numerical simulations for the most common cases of holographic formation schemes are made. It is shown that due to the photo-induced Freedericksz transition, in the case of arbitrary polarization states of recording light beams, the non-uniform polarization diffraction grating (PDG) is formed in LC-PPM. Numerical simulations' results show that PDG's contribution to the change of the dielectric tensor of the media is comparable with the contribution of the photopolymerization-diffusion process.
在这项工作中，建立了一种在含有染料敏化剂的液晶 - 光聚合物（LC - PPM）复合材料中形成非均匀衍射结构全息图的理论模型。该模型考虑了记录光场的幅度和相位空间分布的任意特性、其任意偏振态以及记录过程的非线性。研究了两种最常见的液晶 - 光聚合物复合材料类型：全息聚合物分散液晶（H - PDLC）和聚合物稳定液晶（PSLC）。对全息形成方案的最常见情况进行了数值模拟。结果表明，由于光致弗雷德里克兹转变，在记录光束具有任意偏振态的情况下，在LC - PPM中形成了非均匀偏振衍射光栅（PDG）。数值模拟结果表明，PDG对介质介电张量变化的贡献与光聚合 - 扩散过程的贡献相当。
