Theoretical and experimental optical studies of cholesteric liquid crystal films with thermally induced pitch gradients.
Theoretical and experimental optical studies of cholesteric liquid crystal films with thermally induced pitch gradients.
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DOI：
10.1103/physreve.73.061701
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发表时间：
2006-06
期刊：
影响因子：
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通讯作者：
D. Zografopoulos;E. Kriezis;M. Mitov;C. Binet
中科院分区：
文献类型：
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作者：
D. Zografopoulos;E. Kriezis;M. Mitov;C. Binet
从理论和实验上研究了具有热致螺距梯度的多层膜的反射特性。它示出，这种薄膜的光学行为对应于平均贡献的随机间距变化的配置文件的数量，由于横向和纵向的不均匀性，在这种样品的螺旋结构的发展。根据退火时间，窄带和宽带行为可以选择性地实现。从理论上分析了间距分布梯度对反射镜样品宽带反射性能的影响，并提出了一种实现最佳效率的多层结构。
The reflection properties of cholesteric films with thermally induced pitch gradients are theoretically and experimentally studied. It is shown that the optical behavior of such films corresponds to the averaged contribution of a number of stochastic pitch variation profiles, due to the transversal and longitudinal nonuniformities that develop in the helical structure of such samples. Depending on the annealing time, both narrow-band and broadband behavior can be selectively achieved. The influence of the pitch profile gradient on the broadband reflection performance of cholesteric samples is theoretically analyzed, and a multi-slab structure for achieving optimum efficiency is proposed.