Application of Berreman model to Biazial Nematic Liquid Crystals
Fukuda et al. reexamined the Berremans model which attributes the surface anchoring to the elastic distortion of the uniaxial nematic liquid crystal induced by the grooves of a surface. They showed that at the variance with the assumption made in the original approach of Berreman, the azimuthal distortion of the director cannot be considered as negligibly small. Now this method is generalized to the biaxial nematic liquid crystals, with some approximations for the elastic constants. We obtain an additional term in the elastic distortion energy per unit area which depends on the second power of the cosine of the angle made between the main director (n→) at infinity and the direction of the surface grooves. This additional term describes the distortion energy of the minor director (m→) induced by the surface grooves when the (n→) director is anchored exactly along the grooves. We have studied the stability of the (n→) director around the grooves, and in one-constant model for each director the stability condition is that the elastic constant of the (n→) director is the maximum.
Berremans model biazial nematic liquid crystal groove elastic distortion
Zhidong ZHANG Wenjiang YE
Department of Applied Physics, Hebei University of Technology, Tianjin, 300401, P.R.China
国际会议
The 11th Asian Symposium on Information Display(ASID09)(第11届亚洲信息显示会议)
广州
英文
93-96
2009-10-07（万方平台首次上网日期，不代表论文的发表时间）