Interferometric method for the measurement of the flexoelectric polarisation using nematic liquid crystal phase gratings

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Trabi, C.L. and Smith, A.A.T. and Brown, C.V. (2009) Interferometric method for the measurement of the flexoelectric polarisation using nematic liquid crystal phase gratings. Molecular Crystals and Liquid Crystals, 509. pp. 1120-1134. ISSN 1542-1406 (http://dx.doi.org/10.1080/15421400903066125)

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Abstract

An interferometric method using a nematic liquid crystal phase grating has recently been developed for determining the sum of the flexoelectric coefficients, (e1 + e3) [C. Trabi, C. V. Brown, A. A. T. Smith and N. J. Mottram, Appl. Phys. Lett. 92, 223509 (2008)]. The switching response of the device can be simulated if the applied 0.2 Hz squarewave voltage in the nematic layer is modified so that it is enhanced by a reverse ion-field after each polarity reversal and then decays with time. This process has been investigated using measurements of the transient capacitance of a planar nematic layer to the same waveform.

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