We have developed a method for stabilization of the uniform lying helix (ULH) texture of short pitch cholesterics in an electro-optical device, based on the flexoelectro-optic effect in such a texture. By using a small concentration of photoreactive liquid crystal monomer (less than 5 wt. %) and selecting the illumination conditions, we were able to create a nonuniform polymeric network in the liquid crystal bulk (localized essentially at both substrate surfaces) which stabilized efficiently the amplitude and the phase modulation modes of the device. Most importantly, the effect of the residual birefringence of the polymeric network in the field-unwound state of the device was eliminated resulting thus in a substantial improvement of device performance.
Applied Physics Letters
Copyright 2005 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Appl. Phys. Lett. 86, 161118 (2005) and may be found at http://dx.doi.org/10.1063/1.1897057
Kim, Sang Hwa; Chien, Liang-Chy (2005). Short Pitch Cholesteric Electro-Optical Device Stabilized by Nonuniform Polymer Network. Applied Physics Letters 86(16) doi: 10.1063/1.1897057. Retrieved from https://oaks.kent.edu/cpippubs/144