Orientational Transitions in a Cell with Twisted Nematic Liquid Crystal

We studied a stability of a twisted nematic liquid crystal with a photosensitive chiral dopant under homeotropic boundary conditions. Transition between the homeotropic and twisted alignment induced by photochanges in twisting agent and anchoring strength show hysteresis. The period of the “fingerprints” texture of twisted nematic changes discontinuously under the continuous changes of the concentration of twisting agent.