Dynamics of the reorientation of a ferroelectric liquid crystal under an electric field studied by time-resolved optical waveguide spectroscopy

M. Mitsuishi, S. Ito, M. Yamamoto, T. Fischer, W. Knoll

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The dynamic structure and molecular reorientation of a ferroelectric liquid crystal induced by an alternating electric field have been investigated by time-resolved optical waveguide spectroscopy (TROWS) in which the transient waveguide mode patterns were recorded as a function of both time and angle of incidence of a probe beam. A ferroelectric liquid crystal, 4-(2S, 3S)-[2-chloro-3-methylpentanoyloxy]-4′-octyloxybiphenyl (3M2CPOOB) was utilized, which showed a fast response to an external electric field in the order of a microsecond. Under a high electric field, it forms the so-called bookshelf structure in which the director of 3M2CPOOB is tilted by 22.5° away from the smectic layer normal in the SmC* phase. Time-resolved waveguide mode patterns were successfully obtained with a time-resolution of 1.0 μs which enabled us to determine the transient features of dielectric tensor of 3M2CPOOB molecules in three dimensional coordinate system. A model that the molecular reorientation coupled with the layer buckling and the rotation around the cone was proposed from the quantitative analysis of the TROWS data.

Original languageEnglish
Pages (from-to)1-26
Number of pages26
JournalMolecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals
Volume308
DOIs
Publication statusPublished - 1997

Keywords

  • Ferroelectric liquid crystal
  • Guided optical wave
  • TROWS

ASJC Scopus subject areas

  • Condensed Matter Physics

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