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Proceedings Paper

Influence of phototransformed molecules on optical properties of finite cholesteric liquid-crystal cell
Author(s): Igor P. Pinkevich; Victor Yu. Reshetnyak; Yuri A. Reznikov
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Paper Abstract

A cholesteric liquid crystal (CLC) is considered in a cell with planar boundary conditions, in which long-lived metastable states of molecules with conformation different from that of initial molecules are formed under the action of light. It was suggested that the phenomenon of molecular phototransformation be used for varying the cholesteric twisting ability and thus for controlling the CLC pitch and the wavelength of light selectively reflected from the CLC cell. The dependence of the pitch on both the molecular twisting ability and the anchoring energy of CLC with oriented cell planes was investigated. The expression is derived for the anchoring energy which makes it possible to determine its value through the experimentally measured data. It is shown that with discontinuous change of a pitch there may occur a jump of mean values of components of the CLC dielectric susceptibility tensor. The CLC pitch relaxation appearing on switching off the light was considered.

Paper Details

Date Published: 1 June 1991
PDF: 12 pages
Proc. SPIE 1455, Liquid-Crystal Devices and Materials, (1 June 1991); doi: 10.1117/12.44700
Show Author Affiliations
Igor P. Pinkevich, Kiev Univ. (Ukraine)
Victor Yu. Reshetnyak, Kiev Univ. (Ukraine)
Yuri A. Reznikov, Kiev Univ. (Ukraine)

Published in SPIE Proceedings Vol. 1455:
Liquid-Crystal Devices and Materials
Paul S. Drzaic; Uzi Efron, Editor(s)

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