Influence of DC Electric Field on the Hysteresis of Light-Induced Fr´eedericksz Transition in a Nematic Cell
Keywords:nematic liquid crystals, light-induced Fr´eedericksz transition, hysteresis
The influence of an external dc electric field on the hysteresis of the light-induced Fr´eedericksz transition in a nematic liquid crystal cell in the field of a light beam with a finite diameter has been studied. The external electric field orientations perpendicular to the cell surface and along it, in the direction of the incident light polarization, are considered. The dependences of the Fr´eedericksz transition thresholds for the increasing and decreasing intensities of the incident light on the electric field strength and the transversal light beam size are obtained numerically. The values of transversal light beam size and electric field strength, for which the Fr´eedericksz transition has a hysteretic character, are found. The hysteresis loop width is shown to increase if the dc electric field perpendicular to the cell surface grows. At the same time, the hysteresis loop width decreases, if the electric field is oriented along the cell surface.
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