Dynamic response of a dual-frequency chiral hybrid aligned nematic liquid-crystal cell.
Dynamic response of a dual-frequency chiral hybrid aligned nematic liquid-crystal cell.
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双频手性混合排列向列液晶单元的动态响应。
DOI：
10.1103/physreve.73.011706
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
J. Sambles
中科院分区：
文献类型：
--
作者：
S. Jewell;J. Sambles
利用时间分辨的全漏导模光学表征技术，研究了手性双频混合取向液晶盒对多频脉冲的动态响应。在施加低频电压时，发现电池切换到垂面排列，有效地破坏了电池中的固有扭曲。当该电压紧接着高频电压时，该结构被驱动成均匀排列的扭曲结构。指向矢对材料有效介电各向异性变化的响应分析揭示了一种回流形式。这是由于指向矢的旋转和流动之间的耦合、节距对单元中扭曲的约束作用以及指向矢进入均匀对准的驱动的组合而产生的。测量的导演配置文件已被比较使用Leslie-Eriksen-Parodi线虫动力学理论产生的模型配置文件，并已确定的材料的粘度系数。
The dynamic response of a chiral dual-frequency hybrid aligned nematic liquid-crystal cell to a multiple frequency pulse has been characterized using a time-resolved fully leaky guided-mode optical characterization technique. On application of a low-frequency voltage the cell is found to switch to homeotropic alignment, effectively destroying the inherent twist in the cell. When this voltage is immediately followed by a high-frequency voltage the structure is driven into a homogeneously aligned twisted structure. Analysis of the response of the director to this change in effective dielectric anisotropy of the material reveals a form of backflow. This arises due to the combination of the coupling between the rotation and flow of the director, the constraining effect of the pitch on the twist in the cell, and the driving of the director into homogeneous alignment. The measured director profiles have been compared to model profiles generated using the Leslie-Eriksen-Parodi nematodynamics theory, and the viscosity coefficients for the material have been determined.