Pacific Science Review A: Natural Science and Engineering最新文献

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Model of the formation of holographic polarization gratings in PDLC taking into account light-induced absorption changes and strong surface adhesion 考虑光致吸收变化和强表面附着力的PDLC全息偏振光栅形成模型

Pacific Science Review A: Natural Science and Engineering

Pub Date : 2015-01-01 DOI: 10.1016/j.psra.2015.08.001

A.O. Semkin, S.N. Sharangovich

In this paper, an analytical model of the formation of holographic polarization gratings (HPGs) in PDLCs that accounts for light-induced changes in absorption coefficient and the strong adhesion of liquid crystal molecules to the bounding surfaces is developed. Holographic formation by two linearly orthogonally polarized beams is considered. The formation of HPGs in PDLCs is possible due to the light-induced periodic spatial inhomogeneity of the optical anisotropy of the material caused by the superposition of two plane coherent orthogonally polarized waves on the sample plane (under the influence of the photo-induced Fredericks effect), which is stabilized as a result of the phase separation of the PDLC components during the photopolymerization process. Expressions for the exact and approximate solutions of the recording problem are obtained, and numerical simulation of the spatial changes of the dielectric tensor was performed. The obtained results can be used to develop a model of the diffraction of light beams on the spatially inhomogeneous HPGs.

本文建立了pdlc中全息偏振光栅(HPGs)形成的解析模型，该模型考虑了光诱导吸收系数的变化和液晶分子与边界面的强粘附。考虑了两束线正交偏振光束形成全息。PDLC中HPGs的形成是由于两个平面相干正交极化波在样品平面上的叠加(在光致Fredericks效应的影响下)引起的材料光学各向异性的光致周期性空间非均匀性，而在光聚合过程中，PDLC组分的相分离使其稳定下来。得到了记录问题的精确解和近似解的表达式，并对介电张量的空间变化进行了数值模拟。所得结果可用于建立光束在空间非均匀光子晶体上的衍射模型。

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