Numerical study of deformations induced by ac electric field in insulating flexoelectric nematic layers

G. Derfel, M. Buczkowska

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


The influence of the frequency f of applied ac electric field on the time dependence of electric field induced deformations of homeotropic nematic layers is studied numerically. Three kinds of nematic liquid crystals were considered: non-flexoelectric nematic with negative dielectric anisotropy, Δε < 0, dielectrically compensated nematic (Δε = 0) possessing flexoelectric properties determined by the positive sum of flexoelectric coefficients e = e11 + e33 > 0, nematic characterised by both Δε < 0 and e > 0. It was found that at sufficiently low frequencies, the deformations varied with time. The deformations of purely dielectric nature had the period 1/(2f). When the frequency was increased, a stationary director distribution was achieved, determined by the rms value of the ac voltage. The time period of purely flexoelectric distortions was equal to 1/f. There was a well defined cut-off frequency above which these deformations vanished. In the case of dielectrically anisotropic and flexoelectric nematic, the flexoelectric contribution vanished above a critical frequency and the deformation of dielectric nature stabilized at high frequencies.

Original languageEnglish
Pages (from-to)66-70
Number of pages5
JournalOpto-Electronics Review
Issue number1
StatePublished - 1 Jan 2011
Externally publishedYes


  • ac electric field induced deformations
  • flexoelectric nematic

ASJC Scopus subject areas

  • Radiation
  • General Materials Science
  • Electrical and Electronic Engineering


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