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

C.L. Trabi, C.V. Brown, A.A.T. Smith, N.J. Mottram

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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.
Original languageEnglish
Article number223509
Number of pages3
JournalApplied Physics Letters
Issue number22
Publication statusPublished - 5 Jun 2008


  • interferometric method
  • flexoelectric coefficients
  • (e(1)+e(3))
  • ionic nematic material

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