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Current issue   Ukr. J. Phys. 2016, Vol. 61, N 2, p.117-124
doi:10.15407/ujpe61.02.0117    Paper

Ledney M.F., Tarnavskyy O.S., Khimich V.V.

Taras Shevchenko National University of Kyiv, Faculty of Physics
(4, Academician Glushkov Ave., Kyiv 03680, Ukraine; e-mail: Ledney@univ.kiev.ua)

Influence of dc Electric Field on the Hysteresis of Light-Induced Fréedericksz Transition in a Nematic Cell

Section: Soft matter
Original Author's Text: Ukrainian

Abstract: The influence of an external dc electric field on the hysteresis of the light-induced Fréedericksz 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 Fréedericksz 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 Fréedericksz 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.

Key words: nematic liquid crystals, light-induced Fréedericksz transition, hysteresis.

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