Nonlinear Raman spectroscopy of liquid crystals

Orientational alignment and switching behaviour in a ferroelectric liquid crystal mixture

W. Jeremy Jones, Ric Allott, Jan Baran, A. Grofcsik, M. Kubinyi, Maurice Stanley

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Picosecond inverse Raman spectroscopy has been employed to probe the alignment behaviour and switching characteristics of a 6 μm thick ferroelectric liquid crystal based on a host mixture of fluorinated phenyl biphenylcarboxylates and a chiral dopant. Optical bistability is observed in the Raman signal on application of dc electric fields of opposite polarity. For particular polarities of the applied field, the Raman signals display a cos4 θ dependence on the angle of rotation around the beam direction. Reorientational rate constants of 300 μs and 590 μs are observed for the aromatic core at the high-voltage limit for the rise and decay of the 1600 cm-1 Raman signal on application of a switching ac electric field.

Original languageEnglish
Pages (from-to)1025-1037
Number of pages13
JournalMolecular Physics
Volume88
Issue number4
Publication statusPublished - Jul 1996

Fingerprint

Liquid Crystals
Raman Spectrum Analysis
Ferroelectric materials
Raman spectroscopy
liquid crystals
alignment
Electric fields
Optical bistability
polarity
Rate constants
optical bistability
electric fields
Doping (additives)
high voltages
Electric potential
probes
decay
Direction compound

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Nonlinear Raman spectroscopy of liquid crystals : Orientational alignment and switching behaviour in a ferroelectric liquid crystal mixture. / Jones, W. Jeremy; Allott, Ric; Baran, Jan; Grofcsik, A.; Kubinyi, M.; Stanley, Maurice.

In: Molecular Physics, Vol. 88, No. 4, 07.1996, p. 1025-1037.

Research output: Contribution to journalArticle

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