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Proceedings Paper

Photoinduced liquid crystal anchoring transition on polysiloxane-based aligning surface
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Paper Abstract

We report a novel azimuthal anchoring transition of nematic liquid crystal on a polysiloxane-cinnamate treated surface under the UV irradiation. It is found, that the direction of the light-induced easy axis strongly depends on the irradiation time. Under short exposure times the orienting surface provides an orientation of LC parallel to the direction of the uV light polarization. Longer times give the orthogonal to the UV polarization orientation of LC. There is region of exposure times that give a bistable anchoring conditions and domains with different directions of the director orientation. We propose a phenomenological model of this anchoring transition and surface bistability based on the competition between trans-cis isomerization of the side fragments of the polysiloxane-cinnamate material and cross-linking photoreaction of the transform of side fragments resulting in orthogonal molecular easy axes.

Paper Details

Date Published: 23 September 1998
PDF: 5 pages
Proc. SPIE 3488, Nonlinear Optics of Liquid and Photorefractive Crystals II, (23 September 1998); doi: 10.1117/12.323701
Show Author Affiliations
Denis Andrienko, Institute of Physics (Ukraine)
Andrey Dyadyusha, Institute of Physics (Ukraine)
Yuri Kurioz, Institute of Physics (Ukraine)
Victor Yu. Reshetnyak, Institute of Physics (Ukraine)
Yuri A. Reznikov, Institute of Physics (Italy)

Published in SPIE Proceedings Vol. 3488:
Nonlinear Optics of Liquid and Photorefractive Crystals II
Gertruda V. Klimusheva, Editor(s)

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