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Direct evidence of the molecular switching in electrically commanded surfaces for liquid crystal displays

Journal article
Authors Miha Škarabot
Igor Muševič
Bertil Helgee
Lachezar Komitov
Published in Journal of Applied Physics
Volume 98
Pages 046109
ISSN 0021-8979
Publication year 2005
Published at Department of Physics (GU)
Pages 046109
Language en
Keywords nematic liquid crystals, ferroelectric liquid crystals, liquid crystal polymers, polymer films, molecular reorientation, molecular orientation, time resolved spectra, birefringence, electro-optical effects, permittivity, ferroelectric switching
Subject categories Material physics with surface physics, Functional materials, Surface engineering, Surfaces and interfaces, Condensed Matter Physics, Optical physics, Optics

Abstract

This work, performed by means of time-resolved high-resolution birefringence measurements, establishes the switching mechanism of electrically commanded surfaces _ECS_ for liquid-crystal displays. A distinct polar electro-optic response, due to the field-induced in-plane switching of the molecules of the 200-nm ferroelectric liquid crystalline polysiloxane alignment layer representing ECS, was detected in a cell filled with isotropic liquid _hexadecane_. The similarity between this response and the one reported recently in cells containing the same ECS but with a nematic liquid-crystal bulk with negative dielectric anisotropy (Delta-epsilon < 0) and field-free planar alignment provides direct and unambiguous proof that the switching in these cells is indeed mediated by the ECS. © 2005 American Institute of Physics. _DOI: 10.1063/1.2009071_

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