Opticals Effects in Liquid Crystals pp 224-228 | Cite as
Photostimulated change of phase-transition temperature and “giant” optical nonlinearity of liquid crystals
Abstract
It is shown that the optical “giant” conformation nonlinearity of nematic liquid crystals is due to the change of the macroscopic order parameter of the crystal and to the high-frequency polarizability of the molecules that enter it during the conformation transition. The change of the order parameter leads to the experimentally observed shift of the phase-transition temperature of a nematic MBBA liquid crystal when acted upon by laser radiation of wavelength near the crystal absorption band. The magnitude and sign of the shift determine the experimentally obtained values and signs of the nonlinearity parameter, while the temperature dependence of the refractive index determines the observed growth of these parameters as the clearing point is approached from the mesophase side.
Keywords
Liquid Crystal Nematic Liquid Crystal Holographic Grating Clearing Point Conformation TransitionPreview
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Notes
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