Reorientation of nematic liquid crystal under the action of light with stigmatic and astigmatic Gaussian profile

Svitlana Subota; Victor Yu. Reshetnyak; Marat S. Soskin

doi:10.1117/12.486652

11 December 2002 Reorientation of nematic liquid crystal under the action of light with stygmatic and astygmatic Gaussian profile

Svitlana Subota, Victor Yu. Reshetnyak, Marat S. Soskin

Author Affiliations +

Proceedings Volume 4938, Selected Papers from the International Conference on Spectroscopy of Molecules and Crystals; (2002) https://doi.org/10.1117/12.486652
Event: XV International School on Spectroscopy of Molecules and Crystals, 2001, Chernivsti, Ukraine

Abstract

We report on theoretical study of optical singularity birth in a wave front of light beam with stigmatic and astigmatic Gaussian profile with intially smooth wave front passing through a homeotropically aligned nematic liquid crystal (NLC) cell. When a linearly polarized astigmatic Gaussian light beam illuminates the cell, the light induced Frederick's transition can be observed. Strong director anchoring at the cell walls is assumed. Ritz's variational method is used, i.e. the profile of director reorientation is considered to be similar to astigmatic Gaussian profile. Parameters of the trial function are calculated numerically. The threshold intensity of light beam is appeared to increase with increasing of asymmetry of the beam under the constant value of laser beam area and cell thickness. Utilizing the Huygens-Fresnel principle and geometrical optics approximation we calculate the amplitude distribution in space for different distances from the cell. It is obtained that in the case of stygmatic Gaussian beam incidence on NLC cell the circular edge dislocation is born.

Citation Download Citation

Svitlana Subota, Victor Yu. Reshetnyak, and Marat S. Soskin "Reorientation of nematic liquid crystal under the action of light with stygmatic and astygmatic Gaussian profile", Proc. SPIE 4938, Selected Papers from the International Conference on Spectroscopy of Molecules and Crystals, (11 December 2002); https://doi.org/10.1117/12.486652

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