CUED Publications database

Comparison of relative flexoelectric coefficients measured by different techniques

Clarke, MJ and Musgrave, B and Coles, MJ and Blatch, AE and Coles, HJ (2004) Comparison of relative flexoelectric coefficients measured by different techniques. Proceedings of SPIE - The International Society for Optical Engineering, 5289. pp. 182-187. ISSN 0277-786X

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Abstract

While it is well known that it is possible to determine the effective flexoelectric coefficient of nematic liquid crystals using hybrid cells [1], this technique can be difficult due to the necessity of using a D.C. field. We have used a second method[2], requiring an A.C. field, to determine this parameter and here we compare the two techniques. The A.C. method employs the linear flexoelectrically induced linear electro-optic switching mechanism observed in chiral nematics. In order to use this second technique a chiral nematic phase is induced in an achiral nematic by the addition of a small amount of chiral additive (∼3% concentration w/w) to give helix pitch lengths of typically 0.5-1.0 μm. We note that the two methods can be used interchangeably, since they produce similar results, and we conclude with a discussion of their relative merits.

Item Type: Article
Uncontrolled Keywords: Chiral Flexoelectric Nematic
Subjects: UNSPECIFIED
Divisions: Div B > Photonics
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:51
Last Modified: 08 Dec 2014 02:28
DOI: 10.1117/12.532176