Terahertz dichroism of MBBA liquid crystal on rubbed substrate

Jun ichi Nishizawa, Tetsuya Yamada, Tetsuo Sasaki, Tadao Tanabe, Toshimasa Wadayama, Takenori Tanno, Ken Suto

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

Terahertz (THz) dichroism of a nematic liquid N-(p-methoxybenzylidene)-p-butylaniline (MBBA) was measured using a GaP Raman THz spectrometer. MBBA on a rubbed plastic substrate generates a band at around 4.0 THz: its liquid crystal phase shows strong dichroism, which well corresponds to that of the IR absorption caused by π(C{single bond}H) of MBBA molecule reported in the literature. Based on inferences drawn from the present THz and the published IR dichroic results, the 4.0 THz band probably stems from lateral intermolecular or intramolecular interactions of MBBA molecules aligned to the rubbing direction. The results clearly demonstrate that THz spectroscopy is powerful for discussing of phase transition and dichroism of liquid crystals.

Original languageEnglish
Pages (from-to)4226-4229
Number of pages4
JournalApplied Surface Science
Volume252
Issue number12
DOIs
Publication statusPublished - 2006 Apr 15

Keywords

  • Liquid crystal (LC)
  • MBBA
  • Terahertz dichroism

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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