Optimizing the physical parameters of longitudinal flexoelectric domains (variable-grating modes) on which ac and dc voltages act at the same time

摘要

An exact solution is obtained that describes the anisotropic behavior of Vistin'-Pikin-Bobylev flexoelectric domains (a variable-grating mode, or VGM) excited by the simultaneous action of orienting high-frequency and dc voltages. Based on this solution, exact formulas are computed that describe threshold voltages U-c and wave number q(c) as a function of high-frequency voltage U-ac and the physical parameters of a liquid crystal (LC) in the case of rigid coupling of the LC on the surface of LC cells. A direct relationship is established between U-c and q(c) after eliminating U-ac. Based on the resulting formulas, computations are carried out that determine the optimum values of the physical parameters of a nematic. They can improve the quality both of LC devices constructed on the VGM principle and of gratings based on flexoelectric domains. (c) 2005 Optical Society of America.