Comparison of relative flexoelectric coefficients measured by different techniques

Matt J. Clarke; Bronje Musgrave; Marcus J. Coles; Andrew E. Blatch; Harry J. Coles

doi:10.1117/12.532176

28 May 2004 Comparison of relative flexoelectric coefficients measured by different techniques

Matt J. Clarke, Bronje Musgrave, Marcus J. Coles, Andrew E. Blatch, Harry J. Coles

Proceedings Volume 5289, Liquid Crystal Materials, Devices, and Applications X and Projection Displays X; (2004) https://doi.org/10.1117/12.532176
Event: Electronic Imaging 2004, 2004, San Jose, California, United States

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.

Citation Download 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, (28 May 2004); https://doi.org/10.1117/12.532176

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