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Proceedings Paper

Determination of polar anchoring energy coefficient for nematics: substrate systems by wedge cell method
Author(s): Jerzy Kedzierski; Zbigniew Raszewski; Marek Andrzej Kojdecki; Emilia Miszczyk; Ludwika Lipinska; Ewa Bialecka-Florjanczyk; A. Orzeszko
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Paper 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.

Paper Details

Date Published: 27 June 2002
PDF: 8 pages
Proc. SPIE 4759, XIV Conference on Liquid Crystals: Chemistry, Physics, and Applications, (27 June 2002); doi: 10.1117/12.472168
Show Author Affiliations
Jerzy Kedzierski, Military Univ. of Technology (Poland)
Zbigniew Raszewski, Military Univ. of Technology (Poland)
Marek Andrzej Kojdecki, Military Univ. of Technology (Poland)
Emilia Miszczyk, Radom Univ. of Technology (Poland)
Ludwika Lipinska, Institute of Electronic Materials Technology (Poland)
Ewa Bialecka-Florjanczyk, Warsaw Agricultural Univ. (Poland)
A. Orzeszko, Warsaw Agricultural Univ. (Poland)


Published in SPIE Proceedings Vol. 4759:
XIV Conference on Liquid Crystals: Chemistry, Physics, and Applications

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