Abstract

Liquid crystal molecules can be reoriented by weak light field. Indeed, this reorientation depends on anchoring energies, boundary conditions and also on the thickness of liquid crystal. Laser-induced hydrodynamic motions in initially hybrid oriented nematic liquid crystal have been studied theoretically under different laser power. It has been shown the reorientation of liquid crystal molecules induced by direct volume expansion mechanism for two directions of hydrodynamic flow. It has been studied the dependence of specific reorientation on anchoring energies. Hydrodynamic flow velocity gradient brings about a small increase of curvature when hydrodynamic flow velocity is directed out of the ‘‘flexible ribbon’s’’ curvature. The ‘‘flexible ribbon’’ reverses its curvature when velocity is directed into ‘‘flexible ribbon’s’’ curvature and when we have weak anchoring from planar boundary.

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