Influence of the surface pretilt angle on spatially periodic deformations in nematic layers

Mariola Buczkowska, Grzegorz Derfel

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


The deformations induced by electric field in twisted or untwisted flexoelectric nematic layers can be homogeneous (i.e. one-dimensional) or spatially periodic (i.e. two-dimensional). The periodic deformations are undesirable from an applicative point of view since they destroy the homogeneous appearance of the area of an excited pixel of a display. They are particularly favoured when the nematic material possesses flexoelectric properties. In order to check whether the unwanted periodic deformations can be eliminated by means of suitable surface pretilt angle, the small deformations arising just above the corresponding threshold voltage were investigated numerically. The nematic materials exhibiting both weak and strong flexoelectricity were taken into account. The surface pretilt angles ranging from 0° to 30° were adopted. It was shown that the periodic patterns, arising in the case of planar surface alignment, disappear if sufficiently large surface pretilt angle is applied.

Original languageEnglish
Pages (from-to)961-964
Number of pages4
JournalLiquid Crystals
Issue number7
StatePublished - 28 May 2018
Externally publishedYes


  • Nematics
  • director deformations
  • flexoelectricity
  • periodic patterns

ASJC Scopus subject areas

  • Chemistry (all)
  • Materials Science (all)
  • Condensed Matter Physics


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