Spontaneous induction of the uniform lying helix alignment in bimesogenic liquid crystals for the flexoelectro-optic effect

Damian J. Gardiner, Stephen M. Morris, Philip J. W. Hands, Flynn Castles, Malik M. Qasim, Wook-Sung Kim, Su Seok Choi, Timothy D. Wilkinson, Harry J. Coles

Research output: Contribution to journalArticlepeer-review

Abstract

Using in-plane electric fields, the electrical induction of the uniform lying helix (ULH) alignment in chiral nematic liquid crystals is reported. This process permits spontaneous induction of the ULH alignment to give an in-plane optic axis, without the need for complex processing. Flexoelectro-optic switching is subsequently obtained by holding the in-plane electrodes at a common voltage and addressing via a third, plane-parallel electrode on a second, or upper, substrate to give a field across the device in the viewing direction. For this device, in optimized bimesogenic materials, we demonstrate full intensity modulation and sub-millisecond response times at typical device temperatures. (C) 2012 American Institute of Physics. [doi:10.1063/1.3682305]

Original languageEnglish
Article number063501
Pages (from-to)-
Number of pages4
JournalApplied Physics Letters
Volume100
Issue number6
DOIs
Publication statusPublished - 6 Feb 2012

Keywords

  • chirality
  • electro-optical effects
  • intensity modulation
  • nematic liquid crustals

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