Some Light-Induced Orientational Effects in Nematic Liquid Crystals

Some new light-induced orientational-hydrodynamical nonlinear optical effects in nematic liquid crystals (NLC) are presented. Among them jump-like light-induced hydrodynamic reorientation caused by direct volume expansion, thermomechanical oscillations in hybrid NLC and thermomechanical mechanism of...

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Bibliographic Details
Published in:Journal of physics. Conference series 2012-01, Vol.350 (1), p.12034-8
Main Authors: Hakobyan, R S, Hakobyan, M R, Aleksanyan, A K, Gevorgyan, G S, Alaverdyan, R B
Format: Article
Language:English
Subjects:
Azo compounds
Crystal structure
Fluid dynamics
Fluid flow
Hydrodynamics
Incidence angle
Lasers
Liquid crystals
Nematic
Nematic crystals
Nonlinearity
Oscillations
Physics
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Summary:Some new light-induced orientational-hydrodynamical nonlinear optical effects in nematic liquid crystals (NLC) are presented. Among them jump-like light-induced hydrodynamic reorientation caused by direct volume expansion, thermomechanical oscillations in hybrid NLC and thermomechanical mechanism of orientational optical nonlinearity in twist aligned NLC as well as in azobenzene liquid crystals. It is also shown that the orientational optical nonlinearity of revealed thermomechanical effect may be as strong as well-known giant optical nonlinearity. Besides, at normal incidence of laser the giant optical nonlinearity does not exist, but thermomechanical effect exists at any angle of incidence of laser radiation and the nonlinearity of thermomechanical effect remains in the same order.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/350/1/012034