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Browse Journals & Magazines > Applied Physics Letters ...> Volume:92 Issue:22 Help

Interferometric method for determining the sum of the flexoelectric coefficients (e1+e3) in an ionic nematic material

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4 Author(s)
Trabi, C.L. ; School of Science and Technology, Nottingham Trent University, Clifton Lane, Nottingham NG11 8NS, United Kingdom ; Brown, C.V. ; Smith, A.A.T. ; Mottram, N.J.

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The time-dependent periodic distortion profile in a nematic liquid crystal phase grating has been measured from the displacement of tilt fringes in a Mach–Zehnder interferometer. A 0.2 Hz squarewave voltage was applied to alternate stripe electrodes in an interdigitated electrode geometry. The time-dependent distortion profile is asymmetric with respect to the polarity of the applied voltage and decays with time during each half period due to ionic shielding. This asymmetry in the response allows the determination of the sum of the flexoelectric coefficients (e1+e3) using nematic continuum theory since the device geometry does not possess inherent asymmetry.

Published in:
Applied Physics Letters  (Volume:92 ,  Issue: 22 )

Date of Publication: Jun 2008

Page(s):
223509 - 223509-3
ISSN :
0003-6951
Digital Object Identifier :
10.1063/1.2938722
Product Type:
Journals & Magazines
Date of Current Version :
18 June 2009
Issue Date :
Jun 2008

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