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>Electro- and photoswitching of undulation structures in planar
cholesteric layers aligned by a polyimide film possessing various values of
the anchoring energy
【2h】
Electro- and photoswitching of undulation structures in planar
cholesteric layers aligned by a polyimide film possessing various values of
the anchoring energy
The base for this manuscript was laid down by the studies carried out in thearticle by Senyuk B, et. al. Proceedings of SPIE. 2005; 5936: 59360W-1-9. Inthe present manuscript, a planar layer of the photosensitive cholesteric, basedon the chiral dopant 2-(4'-phenylbenzylidene)-p-menthane-3-one dissolved in thenematic E7, under the alternating electric field was explored. In particular,the influence of UV exposure and the value of the azimuthal anchoring energy onelectro- and photoswitching of undulation instabilities was considered. Due tothe decrease in a ratio between the LC cell thickness d and the cholesterichelical pitch P, different types of undulations, observed under the electricalfield, were switched by UV exposure. The change in the ratio d/P was realizedowing to the unwinding of the photosensitive cholesteric helix during UVexposure in the LC cell with a fixed thickness d. Sequential transitions oftypes of the undulations from 2D to two 1D structures (1D|| and 1D_) wereachieved. The undulation structure 1D|| with a controlled period of a gratingin electric field was examined. Dependencies of jumps of the period and thediffraction efficiency of a photosensitive cholesteric grating on the anchoringenergy of alignment layers were analyzed.
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机译：Senyuk B等人在本文中进行的研究奠定了该手稿的基础。等SPIE的议事录。 2005; 5936：59360W-1-9。在本手稿中，研究了在交变电场下基于手性掺杂剂2-（4'-苯基亚苄基）-p-薄荷烷-3-酮溶解的光敏胆甾型平面层。特别地，考虑了紫外线暴露和方位锚固能量的值对起伏不稳定性的电和光开关的影响。由于LC单元厚度d和胆甾醇间距P之间的比率的减小，在电场下观察到的不同类型的起伏通过紫外线暴露而切换。 d / P之比的变化是由于在固定厚度d的LC单元中在UV曝光期间光敏胆甾醇螺旋的展开而实现的。实现了从2D到两个1D结构（1D ||和1D_）起伏类型的顺序转换。波动结构1D ||研究了具有受控周期的光栅电场。分析了周期跳跃和光敏胆甾型光栅衍射效率对取向层锚固能的依赖性。
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