Optical determination of flexoelectric coefficients and surface polarization in a hybrid aligned nematic cell

A. Mazzulla, F. Ciuchi, J. R. Sambles
2001 Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics  
We present an optical study of the influence of both the flexoelectric effect and surface polarization on a hybrid-aligned nematic cell using the half-leaky guided mode technique. Tilt angle profiles, obtained from fits of experimental data ͑reflectivity curves͒ taken under applied voltages, are compared with the ones derived by a complete theoretical model. Measurements with an applied alternating voltage allow the evaluation of the anchoring energy by solving the torque balance equation at
more » ... ance equation at the planar surface. From measurements with static fields, the sum of flexoelectric coefficients and the surface polarization are determined by numerical solution of Euler-Lagrange equations.
doi:10.1103/physreve.64.021708 pmid:11497609 fatcat:sdppdwr7wbehllx6twdof4jgey