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Evaluation of Kerr constant of blue-phase liquid crystals by measuring off-axis retardation in vertical electric field cells

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Abstract

Because of the nonuniform electric field of the in-plane-switching cell in the thickness direction, an accurate and efficient way for evaluating the Kerr constant of blue-phase liquid crystal (BPLC) needs to be developed. This study demonstrates a method for evaluating the Kerr constant by measuring the off-axis-induced retardation (Rth) change in normal vertical field cells using a commercial polarimeter. The angle-dependent behavior of the Rth change is observed as an electric-tunable positive C retarder. In this paper, a sigmoid fitting model has been chosen for calculating the Kerr constant for considering the very small intrinsic birefringence of the BPLC.

© 2011 Optical Society of America

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