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Field induced Increase of Pitch in Planar Cholesteric Liquid Crystals
Author(s) -
Chilaya G.,
Hauck G.,
Koswig H. D.,
Petriashvili G.,
Sikharulidze D.
Publication year - 1997
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170320306
Subject(s) - helix (gastropod) , electric field , materials science , liquid crystal , wavelength , texture (cosmology) , field (mathematics) , reflection (computer programming) , planar , optics , optoelectronics , crystallography , chemistry , physics , ecology , mathematics , computer graphics (images) , quantum mechanics , artificial intelligence , snail , computer science , pure mathematics , image (mathematics) , biology , programming language
In cholesteric liquid crystals the application of an electric field parallel to the helix axis can change the wavelength of selective reflection. For decreasing pitch of the studied mixtures, the colour shift becomes more stable against the field‐induced transformation of the initial Grandjean structure into a confocal texture. In compounds with a low crossover frequency, a field induced increase of the pitch was observed at the switching between low and high frequency fields. The investigations allow new conclusions on the origin of the colour shift.