Molecular Crystals and Liquid Crystals, Vol.453, 263-274, 2006
Surface director sliding in LC cell with light-controlled chirality
In this paper we study a surface reorientation of an LC director of the nematic-chiral mixture. The mixture's exposure to the actinic light changes the concentration of chiral agent which leads to the expansion of the pitch, inducing elastic deformation. This causes long range forces of the LC to compete with forces of the rotational viscosity of the easy axis and the anchoring. We study the dynamics of this process experimentally and develop a theoretical model that describes the director distribution in a bulk constrained by asymmetric boundaries. The experimental results are found to be in good agreement with the developed theory.