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Proceedings Article

Comparison of relative flexoelectric coefficients measured by different techniques

[+] Author Affiliations
Matt J. Clarke, Bronje Musgrave, Marcus J. Coles, Andrew E. Blatch, Harry J. Coles

Univ. of Cambridge (United Kingdom)

Proc. SPIE 5289, Liquid Crystal Materials, Devices, and Applications X and Projection Displays X, 182 (May 28, 2004); doi:10.1117/12.532176
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From Conference Volume 5289

  • Liquid Crystal Materials, Devices, and Applications X and Projection Displays X
  • Liang-Chy Chien; Ming H. Wu
  • San Jose, CA | January 18, 2004

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.

© (2004) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Matt J. Clarke ; Bronje Musgrave ; Marcus J. Coles ; Andrew E. Blatch and Harry J. Coles
"Comparison of relative flexoelectric coefficients measured by different techniques", Proc. SPIE 5289, Liquid Crystal Materials, Devices, and Applications X and Projection Displays X, 182 (May 28, 2004); doi:10.1117/12.532176; http://dx.doi.org/10.1117/12.532176


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