Quantification of the azimuthal anchoring of a homogeneously aligned nematic liquid crystal using fully-leaky guided modes
Quantification of the azimuthal anchoring of a homogeneously aligned nematic liquid crystal using fully-leaky guided modes
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使用全泄漏引导模式量化均匀排列向列液晶的方位角锚定
DOI：
10.1080/026782999204705
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发表时间：
1999
期刊：
影响因子：
2.2
通讯作者：
J. Sambles
中科院分区：
文献类型：
--
作者：
B. Hallam;F. Yang;J. Sambles
利用一种新的光学导模技术--全漏导模技术，研究了在平面内电场作用下，填充有向列相液晶E7的均匀排列的常规腔体的指向矢失真。使用沿着金电极边缘方向摩擦的聚酰亚胺来对准液晶。在金电极之间的3 mm间隙上施加弱场，以引起导向器的扭转角的微小变化。这些失真是通过与角度相关的反射率和透射率数据进行拟合来确定的，并与连续介质理论进行了比较。通过对结果的仔细分析，得到了系统的扭转弹性常数K22和方位锚定强度Wa。在23.5℃下，摩擦聚酰亚胺上E7的K22=(6.50±0.05)x10-12N，Wa=(2.9±0.2)x10-5Jm-2。
A novel optical guided mode technique, the fully-leaky guided mode technique, has been used to investigate the director distortion under the application of an in-plane electric field of a homogeneously aligned conventional cell filled with the nematic liquid crystal E7. The liquid crystal is aligned using polyimide rubbed along the direction of the gold electrode edges. A weak field is applied across a 3 mm gap between the gold electrodes to induce small changes in the twist angle of the director. These distortions are determined by fitting to the angledependent reflectivity and transmissivity data and are compared with continuum theory. From careful analysis of the results, both the twist elastic constant, k22, and the azimuthal anchoring strength, Wa, of the system are obtained. At 23.5 C for E7 on rubbed polyimide we find that k22=(6.50±0.05)x10-12N and Wa=(2.9±0.2)x10-5 J m-2.