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Photoinduced Isotropic State of Cholesteric Liquid Crystals: Novel Dynamic Photonic Materials
Author(s) -
Hrozhyk U. A.,
Serak S. V.,
Tabiryan N. V.,
Bunning T. J.
Publication year - 2007
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.200700209
Subject(s) - materials science , cholesteric liquid crystal , liquid crystal , isotropy , azobenzene , optoelectronics , photonics , irradiation , phase (matter) , laser , doping , optics , photochemistry , chemical physics , polymer , composite material , organic chemistry , physics , chemistry , nuclear physics
The photoinduced isotropic (PHI) state of cholesteric liquid crystals (CLCs) induced by the UV irradiation of a highly doped (azobenzene liquid crystal) CLC can be stable for tens of hours dominated by the lifetime of the cis isomers. Low‐power laser light can be used to write complex 2D images (a car is shown), where the contrast arises from restoration of the reflective cholesteric phase.