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17 March 2000 Surface behavior of V-shaped switching in smectic-C*-like liquid crystals
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V-shaped switching in the smectic-C* like phase of a three- component mixture has been studied from the viewpoint of surface behavior. Two alignment layers, polyvinylalcohol (PVA) and polyimide (PI), were used to study the effect of alignment layer. Electro-optic, switching current and dielectric measurements were conducted using cells with various cell thicknesses. The PI cells exhibit V-shaped switching, though the PVA cells show bistable switching, clearly indicating the importance of alignment layer to realize V-shaped switching. The specialty of the three-component mixture was confirmed in the cell thickness dependence of the dielectric strength (Delta) (epsilon) and the relaxation time (tau) r. Namely, (Delta) (epsilon) and (tau) r show linear dependences on the cell thickness and does not saturate even in 50 micrometer cells, which are quite different from those in conventional ferroelectric liquid crystals. Attenuated total internal reflection ellipsometry was made to evaluate the molecular orientation and switching behavior near the surfaces. It was found that the orientation and the switching characteristics are almost the same as in the bulk, i.e., (1) molecules are aligned along the layer normal at 0 V, which is deviated from the rubbing direction by about 10 degrees, and (2) switching occurs collectively without threshold.
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Michi Nakata, Shinya Ikeda, Toyokazu Ogasawara, Yoichi Takanishi, Ken Ishikawa, and Hideo Takezoe "Surface behavior of V-shaped switching in smectic-C*-like liquid crystals", Proc. SPIE 3955, Liquid Crystal Materials, Devices, and Flat Panel Displays, (17 March 2000);


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