单畴液晶聚合物材料光机械行为的偏振依赖性
Polarization dependence of photo-mechanical behavior of monodomain liquid crystal polymeric materials
摘要：
研究了单畴光致变色玻璃态液晶聚合物在偏振紫外光作用下的光机械行为与偏振态的关系。通常已知反式-顺式光异构化在“平行照射”（平行于LC指向矢的偏振）下最强烈，因为当偏振与训练偶极矩对齐时，光-介质相互作用是活跃的。我们表明，在平行照明，虽然顺式异构体从反式转换的最接近的表面，他们可以是至少低于一定的光传播深度。膜力是trans-cis转换在传播深度上的平均效应，显示出单调的偏振依赖性，即在平行照明下最大，这与实验[1]吻合得很好。然而，在强照明下，顺式分数/光收缩分布通过深度显示深穿透，切换光矩的偏振依赖性，这与光收缩梯度有关-本文对这一现象给出了直观的解释和薄条极限下的分析论证。
英文摘要：
Polarization dependence of opto-mechanical behavior of monodomain photochromic glassy liquid crystal (LC) polymers under polarized ultraviolet light (PUV) is studied. Trans-cis photo-isomerization is generally known to be most intense at 'parallel illumination' (polarization parallel to LC director), as light-medium interactions are active when polarization aligns with trainsition dipole moment. We show that at parallel illumination though cis isomers are converted from trans the most near surface, they can be the least below certain light propagation depth. Membrane force, an average effect of trans-cis conversion over propagation depths, shows a monotonic polarization dependence, i.e. maximum at parallel illumination, which agrees well with experiment [1]. However, under strong illumination, cis fraction/photo-contraction distribution through depths shows deep penetration, switching over the polarization dependence in photo-moment, which is related to photo-contraction gradient ---- photo-moment can be maximum at 'perpendicular illumination' (polarization perpendicular to director) under strong light. We give both intuitive explanation and analytical demonstration in thin strip limit for the switchover.
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