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Proceedings Paper

Effect of permanent dipole moments perpendicular to the molecular long axis on terahertz absorption in liquid crystals
Author(s): S. Tanaka; Y. Okada; K. Yamamoto; Y. Takanishi; M. Tani; K. Ishikawa; M. Hangyo; H. Takezoe
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Paper Abstract

We have measured the terahertz (THz) absorption spectra of MBBA (4-Methoxybenzylidene-4'-n-butylaniline) and its homologues by using THz time-domain and polarized fourier transform far-infrared (FT-IR) spectroscopy, and observed the absorption peak due to the permanent dipole moments perpendicular to the molecular long axis. In addition, we also measured the THz absorption spectra of CCN47 (4'-trans-butyl-4-cyano-4-trans-heptyl-1,1'-bicyclohexane) which has a large permanent moment perpendicular to the long axis, by using polarized far-infrared FT-IR spectroscopy. The relation between the vibration modes and the absorption in the THz region is discussed.

Paper Details

Date Published: 9 February 2007
PDF: 7 pages
Proc. SPIE 6487, Emerging Liquid Crystal Technologies II, 648708 (9 February 2007); doi: 10.1117/12.709109
Show Author Affiliations
S. Tanaka, Tokyo Institute of Technology (Japan)
Y. Okada, Tokyo Institute of Technology (Japan)
K. Yamamoto, Osaka Univ. (Japan)
Y. Takanishi, Tokyo Institute of Technology (Japan)
M. Tani, Osaka Univ. (Japan)
K. Ishikawa, Tokyo Institute of Technology (Japan)
M. Hangyo, Osaka Univ. (Japan)
H. Takezoe, Tokyo Institute of Technology (Japan)

Published in SPIE Proceedings Vol. 6487:
Emerging Liquid Crystal Technologies II
Liang-Chy Chien, Editor(s)

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