混合排列向列相液晶薄盒中-1/2向错引起的有序重构的扩散  

Diffusion of order reconstruction induced by-1/2 wedge disclination in a thin hybrid nematic liquid-crystal cell

作　　者：路丽霞[1,2,3] 张志东[3] 周璇[3] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所,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：《物理学报》2013年第22期319-326,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11374087);河北省高等学校科学技术研究指导项目(批准号:Z2011133)资助的课题~~

摘　　要：基于Landau-de Gennes理论,利用松弛迭代法,研究了混合排列向列相液晶薄盒中1/2向错引起的有序重构的扩散现象,给出了1/2向错的核结构、双轴性结构,以及盒厚减小时有序重构的扩散.当盒厚小于15ξ时,随着盒厚的减小,向错范围和有序重构区域沿基板方向迅速扩散;当盒厚减小到临界厚度10ξ时,有序重构的范围扩散到整个液晶盒中,以向错中心所对应的平面为界,指向矢一部分垂面排列,另一部分沿面排列.本文的研究对拓扑缺陷对向列相液晶中的亚微米胶体粒子的调节作用具有一定的理论指导意义.Based on the Landau-de Gennes theory, the diffusion of order reconstruction induced by？1/2 wedge disclination in a thin hybrid cell is investigated by the relaxation iterative method. The core structure, the biaxial structure, and the diffusion of order reconstruction as the cell thickness decreases, are explored. The defect structure and the range of order reconstruction do not change when the cell thickness is larger than 15ξ. As the thickness decreases from 15ξ, the defect range broadens along the substrate direction, and the biaxial region as well as the range of order reconstruction also enlarges. When the thickness further decreases to below the critical value of 10ξ, the biaxial region and the order reconstruction range merge into an entire cell, where the planar orientation is abruptly converted into the perpendicular one across the biaxial wall. The results obtained in this paper are important for further studying the regulating effect of topological defect on submicron colloidal particles in nematics.

关 键 词：混合排列向列相液晶薄盒 -1 2向错 有序重构扩散 松弛迭代法 

分 类 号：O753.2[理学—晶体学]