混合排列向列相液晶导模中挠曲电效应的影响  

Influence of Flexoelectric Effect on Guided Mode of Hybrid-Aligned Nematic Liquid Crystal

作　　者：邢红玉[1,2,3] 叶文江[3] 司立彬[3] 李志广[3] 张志东[3] 宣丽[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所应用光学国家重点实验室,吉林长春130033 [2]中国科学院大学,北京100049 [3]河北工业大学理学院,天津300401

出　　处：《光学学报》2013年第2期203-209,共7页Acta Optica Sinica

基　　金：国家自然科学基金(11147103;11274088;10974042);河北省自然科学基金(A2010000004);河北省教育厅项目(Z2012061;Z2011133);河北省高校重点学科资助课题

摘　　要：强锚泊混合排列向列相(HAN)液晶盒中,挠曲电效应会对液晶指向矢分布产生影响,这种变化可以通过改进的液晶全漏导模技术实验进行测量。基于液晶多层光学理论和液晶弹性理论,计算得到强锚泊混合排列向列相全漏液晶波导反射率和透射率随内角(光线射入液晶层的角度)的变化曲线,分析了挠曲电效应的影响。挠曲电系数取符号"-"或"+",全漏液晶波导反射率或透射率变化曲线相对于不考虑挠曲电效应时右移或左移一段距离,并且挠曲电系数数值不同移动的距离也会发生变化。由移动距离可知挠曲电系数的数值,为实验确定挠曲电系数提供了理论依据。The flexoelectric effect has an influence on the distribution of liquid crystal in the strong anchoring hybrid-aligned nematic （HAN） liquid crystal cell, which can be measured by the improved full-leaky guided mode technique of liquid crystal. Based on the multi-layer optical theory and the elastic theory of liquid crystal, the variation curves between the reflectivity and transmittance of the full-leaky liquid crystal waveguide due to the strong anchoring hybrid-aligned nematic liquid crystal and the internal angle （the angle of incidence for which light is incident on the liquid crystal layer） are calculated theoretically, by which the influence of flexoelectric effect is analyzed. For different sign of the flexoelectric coefficient such as negative or positive, the variation curves of reflectivity or transmittance of the full-leaky liquid crystal waveguide will move a distance to the left or the right relative to the case of ignoring the flexoelectric effect, and the moved distance will vary with the different flexoelectric coefficients. The flexoelectric coefficients can be known from the moved distance, which provides the theoretical basis for determining the flexoelectric coefficients.

关 键 词：材料 全漏导模技术 挠曲电效应 多层光学理论 弹性理论 混合排列向列相 

分 类 号：O753[理学—晶体学]