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Effects of polymer concentration and localization on the electro-optical performance of cholesteric flexoelectro-optical devices

Journal article
Authors Sang Hwa Kim
Xiaoli Zhou
Lachezar Komitov
Liang-Chy Chien
Published in Proceedings of the SPIE
Volume 5741
Pages 15-22
ISSN 0277-786X
Publication year 2005
Published at Department of Physics (GU)
Pages 15-22
Language en
Links spiedl.aip.org/getpdf/servlet/GetPD...
Keywords flexoelectric, cholesterics, short pitch, photoreactive, polymer, in-plane switching
Subject categories Optics, Optical physics, Condensed Matter Physics, Macromolecular physics, Physical organic chemistry, Polymer Chemistry, Functional materials, Material physics with surface physics

Abstract

We discussed the effect of polymer concentration and localization on flexoelectro-optical device using short pitch cholesterics oriented in uniform lying helix texture. By using a small concentration of photoreactive liquid crystal monomer with various concentrations and selecting the illumination conditions, we have been able to create a localized polymeric network at both substrate surfaces. We can stabilized the two switching modes and eliminating at the same time the effect of the residual birefringence of the polymeric network in the field-unwound state of the sample. The device has two operating modes: amplitude and phase modulation mode, respectively. The amplitude modulation mode is a fast in-plane switching of the device optic axis that enables to achieve a 100 % modulation of the transmitted light intensity whereas the phase mode gives a continuous change of the refractive index and thus of the phase shift of the transmitted light.

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