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Proceedings Paper

Comparison of relative flexoelectric coefficients measured by different techniques
Author(s): Matt J. Clarke; Bronje Musgrave; Marcus J. Coles; Andrew E. Blatch; Harry J. Coles
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Paper Abstract

While it is well known that it is possible to determine the effective flexoelectric coefficient of nematic liquid crystals using hybrid cells, this technique can be difficult due to the necessity of using a D.C. field. We have used a second method, 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.

Paper Details

Date Published: 28 May 2004
PDF: 6 pages
Proc. SPIE 5289, Liquid Crystal Materials, Devices, and Applications X and Projection Displays X, (28 May 2004); doi: 10.1117/12.532176
Show Author Affiliations
Matt J. Clarke, Univ. of Cambridge (United Kingdom)
Bronje Musgrave, Univ. of Cambridge (United Kingdom)
Marcus J. Coles, Univ. of Cambridge (United Kingdom)
Andrew E. Blatch, Univ. of Cambridge (United Kingdom)
Harry J. Coles, Univ. of Cambridge (United Kingdom)

Published in SPIE Proceedings Vol. 5289:
Liquid Crystal Materials, Devices, and Applications X and Projection Displays X
Ming Hsien Wu; Liang-Chy Chien, Editor(s)

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