On the threshold characteristics of the flexoelectric domains arising in a homogeneous electric field: The case of anisotropic elasticity

Precise solutions for the threshold voltage Uc and wave number qc that feature the appearance of longitudinal flexoelectric domains of Vistin’-Pikin-Bobylev at strong anchoring have been derived. Based on the formulated expressions, we present and analyze computer calculations for a planar nematic layer with anisotropic elasticity and both negative and positive dielectric anisotropy under the action of a homogeneous flexoelectrically deforming d.c. electric field. The obtained relations allow a selection of particular values of physical parameters, in order to improve the performance of devices exploiting flexoelectrcity in nematics

On the modelling of a pretilted nematic cell

The authors have found that the perturbation method may be successfully applied in order to get approximated analytical solutions very close to the exact ones for the tilt angle distribution inside a pretilted nematic liquid crystal cell, if the elastic ratio k11/k33 is «, , or » 1. Hence, both the cell impedance and transmittance may be easily predicted for all commonly used nematics