Coexisting nematic and smectic A phases in a twisted liquid crystal cell

L.Z. Ruan, J.R. Sambles, M.A. Osipov

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Abstract

Twisted homogeneously planar-aligned nematic liquid-crystal cells are cooled into the smectic- A phase. The expected defective structure does not form. Instead the cells still show good optical-guiding characteristics. Exploration of the cells using a half-leaky guided-mode arrangement reveals that the liquid-crystal phase separates into three or more regions. Adjacent to both the upper and lower boundaries is a region of highly twisted nematic liquid crystal. In the center of the cell is one or more homogeneous smectic- A regions with smectic layers normal to the cell surfaces, separated by twisted nematic. As the cell is cooled so the smectic- A regions grow in thickness with the nematic regions progressively thinning but with increased twist gradient. A theoretical model of these novel results is presented.
Original languageEnglish
Pages (from-to)4548-4551
Number of pages3
JournalPhysical Review Letters
Volume86
Issue number20
DOIs
Publication statusPublished - May 2001

Keywords

  • liquid crystal cells
  • smectics
  • physics

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