Browsing by Author "Sutormin, Vitaly S."

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Electro-optical response of an ionic-surfactantdoped nematic cell with homeoplanar-twisted configuration transition
(2014-04-01)
Sutormin, Vitaly S.
;
Krakhalev, Mikhail N.
;
Prishchepa, Oxana O.
;
Lee, Wei
;
Zyryanov, Victor Ya
This study is concerned with the optical response of an electro-optical material consisting of nematic liquid crystal as well as ionic surfactant as a dopant. The dopant is a key component to carry out the working of the resulting device through configuration switching. The operational principle is based on the surface anchoring transition induced by a steady electric field. The dynamic characteristics of the electro-optical cell can be considerably improved when the nematic layer is reoriented from the initially homeoplanar director configuration into the twisted state. Besides, a method to shorten the relaxation time is demonstrated by using a controlling pulse with a bipolar waveform. (C)2014 Optical Society of America
Geometric phase and o-mode blueshift in a chiral anisotropic medium inside a Fabry-Perot cavity
(2015-11-24)
Timofeev, Ivan V.
;
Gunyakov, Vladimir A.
;
Sutormin, Vitaly S.
;
Myslivets, Sergey A.
;
Arkhipkin, Vasily G.
Anomalous spectral shift of transmission peaks is observed in a Fabry-Perot cavity filled with a chiral anisotropic medium. The effective refractive index value resides out of the interval between the ordinary and the extraordinary refractive indices. The spectral shift is explained by contribution of a geometric phase. The problem is solved analytically using the approximate Jones matrix method, numerically using the accurate Berreman method, and geometrically using the generalized Mauguin-Poincare rolling cone method. The o-mode blueshift is measured for a 4-methoxybenzylidene-4'-n-butylaniline twisted-nematic layer inside the Fabry-Perot cavity. The twist is electrically induced due to the homeoplanar-twisted configuration transition in an ionic-surfactant-doped liquid crystal layer. Experimental evidence confirms the validity of the theoretical model.