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Proceedings Paper

THz time-domain spectroscopy of liquid crystal colloids
Author(s): Masahito Oh-e; Hiroshi Yokoyama; Mattijs Koeberg; Euan Hendry; Mischa Bonn
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Paper Abstract

THz time-domain spectroscopy is used to measure the frequency dependent (0.2-2.0 THz) complex refractive index of a pure liquid crystal (LC), 4'-n-pentyl-4-cyanobiphenyl (5CB), and its LC colloids with SiO2 particles. While the refractive index of the pure LC is found to vary markedly due to distinct spatial inhomogeneities consisting of oriented domains within the sample, the LC colloids provide us with a spatially much more homogeneous dielectric response which is very stable and reproducible, from which we can reliably deduce the optical constants of pure 5CB using effective medium theory. While the absorption coefficient is found to be very small, the refractive index of 5CB decreases considerably over our probe frequency range.

Paper Details

Date Published: 9 February 2007
PDF: 8 pages
Proc. SPIE 6487, Emerging Liquid Crystal Technologies II, 648706 (9 February 2007); doi: 10.1117/12.712004
Show Author Affiliations
Masahito Oh-e, Japan Science and Technology Agency (Japan)
Hiroshi Yokoyama, Japan Science and Technology Agency (Japan)
Mattijs Koeberg, FOM Institute for Atomic and Molecular Physics (Netherlands)
Euan Hendry, FOM Institute for Atomic and Molecular Physics (Netherlands)
Mischa Bonn, FOM Institute for Atomic and Molecular Physics (Netherlands)

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

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