Characterization of layer‐tilted state in ferroelectric liquid‐crystal cells by electro‐optical switchings
Characterization of layer‐tilted state in ferroelectric liquid‐crystal cells by electro‐optical switchings
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通过电光开关表征铁电液晶细胞的层倾斜状态
DOI：
10.1063/1.342019
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发表时间：
1988
影响因子：
3.2
通讯作者：
A. Lien
中科院分区：
文献类型：
--
作者：
T. Chieu;Kei;A. Lien
使用电光方法，我们确定了表面稳定铁电液晶（SSFLC）单元的指向矢倾斜角、层倾斜角和静态方位角与近晶C相温度的函数关系。该方法基于由于外部场与液晶介质的自发极化和介电各向异性的相互作用而导致的指向矢圆锥运动的集体切换，以及单弹性常数自由能模型。利用总自由能方程，我们证明了层倾斜几何结构中只有张开态才能稳定，但仍然可以获得双稳态细胞。当两个基底表面的表面相互作用不相同时，SSFLC 单元将表现出两种不同的静止状态：一种是稳定的，另一种是准稳定的。静态时从顶部到底部基板的指向矢扭转角以及表面极性与非极性相互作用的比率...
Using an electro‐optical method, we have determined the director tilt angle, the layer‐tilt angle, and the quiescent‐state azimuthal angles of a surface‐stabilized ferroelectric liquid‐crystal (SSFLC) cell as a function of temperature in the smectic C phase. The method is based on a collective switching of the director’s conical motion due to the interaction of the external field with the spontaneous polarization and the dielectric anisotropy of the liquid‐crystal medium, together with a one‐elastic constant free‐energy model. Using the equation of total free energy, we have proved that only splayed states could be stabilized in layer‐tilted geometry, but bistable cells could still be obtained. When the surface interactions at both substrate surfaces are nonidentical, the SSFLC cell will exhibit two distinct quiescent states: one stable and the other quasistable. The twist angles of the director from top to bottom substrates at quiescent states and the ratio of the surface polar to nonpolar interaction ar...