CUED Publications database

The flexoelectric behaviour of a hypertwisted chiral nematic liquid crystal

Noot, C and Coles, MJ and Musgrave, B and Perkins, SP and Coles, HJ (2001) The flexoelectric behaviour of a hypertwisted chiral nematic liquid crystal. Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals, 366. pp. 725-733. ISSN 1058-725X

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Abstract

The flexoelectric behaviour of a hypertwisted chiral nematic bimesogenic liquid crystal is presented. Through detailed electro-optic measurements, with particular emphasis on the switching properties, we demonstrate remarkably high optical axis tilt angles. The material studied possessed a room temperature nematic phase and aligned easily on cooling under the application of a moderate electric field. Switching times of the order of 500 μs and contrast ratios of 90:1 are readily achieved. The tilt angles, measured using the rotating analyser technique, were found to be practically temperature independent and linear with the applied field. Tilt angles of 22.5° were obtained with moderate applied fields of 9.4 V/μm whilst fields of 25 V/μm yielded tilt angles of 45°. We believe these are the highest tilt angles ever recorded for such fields. © 2001 OPA (Overseas Publishers Association) N.V. Published by license under the Gordon and Breach Science Publishers imprint, a member of the Taylor & Francis Group.

Item Type: Article
Uncontrolled Keywords: Bimesogen Chiral Nematic Flexoelectric Hypertwist Liquid Crystal Tilt Angle
Subjects: UNSPECIFIED
Divisions: Div B > Photonics
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 12:01
Last Modified: 08 Dec 2014 02:29
DOI: