Determination of polar anchoring energy coefficient for nematics: substrate systems by wedge cell method

Jerzy Kedzierski; Zbigniew Raszewski; Marek Andrzej Kojdecki; Emilia Miszczyk; Ludwika Lipinska; Ewa Bialecka-Florjanczyk; A. Orzeszko

doi:10.1117/12.472168

27 June 2002 Determination of polar anchoring energy coefficient for nematics- substrate systems by wedge cell method

Jerzy Kedzierski, Zbigniew Raszewski, Marek Andrzej Kojdecki, Emilia Miszczyk, Ludwika Lipinska, Ewa Bialecka-Florjanczyk, A. Orzeszko

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Proceedings Volume 4759, XIV Conference on Liquid Crystals: Chemistry, Physics, and Applications; (2002) https://doi.org/10.1117/12.472168
Event: XIV Conference on Liquid Crystals, Chemistry, Physics, and Applications, 2001, Zakopane, Poland

Abstract

A wedge cell of the wedge angle of order of few milliradians was used to measure the threshold and saturation voltages for the Freedericksz transition induced by an electric field. The nematic liquid crystal filling the cell was of planar orientation enforced by the treatment of the flat boundary plates. A system of interference fringes appeared in the cell placed in normally incident light between an analyzer and a polarizer. In the vicinity of each fringe the cell can be considered as a flat-parallel one and hence it is equivalent to the system of flat cells of different precisely determined thickness. Both the characteristic voltages were interpreted as the eigenvalues of the operator of the second derivative corresponding to the boundary eigenvalue problems with different boundaries; the interaction between the nematics and the substrate was described by the Rapini-Papoular formula. The resulting formulae were used to determine the polar anchoring energy coefficient after the measured characteristic voltages. The method was applied to characterize the coupling between 6CHBT nematic liquid crystal and the substrates made of poly(siloxanoimide), polyvinyl alcohol, indium-tin oxide and silicon oxide.

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Jerzy Kedzierski, Zbigniew Raszewski, Marek Andrzej Kojdecki, Emilia Miszczyk, Ludwika Lipinska, Ewa Bialecka-Florjanczyk, and A. Orzeszko "Determination of polar anchoring energy coefficient for nematics- substrate systems by wedge cell method", Proc. SPIE 4759, XIV Conference on Liquid Crystals: Chemistry, Physics, and Applications, (27 June 2002); https://doi.org/10.1117/12.472168

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