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1 February 1998 Cholesteric liquid crystals in applied electric fields: structural transformations and applications
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The color change electrooptic effect in dual frequency addressable cholesteric liquid crystals (LCs) with an initial planar orientation was investigated. A field induced increase of the pitch was observed for the switching between low and high frequency fields. The investigations allow new conclusions on the origin of blue and red shift observed in an electric field applied parallel to the helix axis. In cholesteric LCs and polymer-dispersed cholesteric LCs with positive dielectric anisotropy, a colored texture with unusual properties was observed for pitch values of P approximately 0.8 micrometers and under certain conditions. This texture appears after the reduction of the electric field during the transition from the homeotropic nematic structure into the cholesteric one. The angular and the electrified dependencies of the spectral characteristics indicate that this state possesses diffractive grating properties. A voltage controlled color shift and a laser beam deflection were investigated.
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Gouram S. Chilaya, G. Hauck, H. D. Koswig, and David Sikharulidze "Cholesteric liquid crystals in applied electric fields: structural transformations and applications", Proc. SPIE 3318, Liquid Crystals: Physics, Technology, and Applications, (1 February 1998);

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