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Proceedings Paper

Photoswitching properties of photonic band gap materials containing azo-polymer liquid crystal
Author(s): Masaki Moritsugu; Tomomi Shirota; Shoichi Kubo; Sun-nam Kim; Tomonari Ogata; Takamasa Nonaka; Osamu Sato; Seiji Kurihara
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Paper Abstract

Photochemically tunable photonic band gap materials were prepared by infiltration of liquid crystal polymers having azobenzene groups into voids of SiO2 inverse opal films. Linearly polarized light irradiation resulted in transformation from a random to an anisotropic molecular orientation of azobenzene side chains in the voids of the SiO2 inverse opal film, leading to the reversible and stable shift of the reflection band to longer wavelength more than 15 nm. In order to improve switching properties, we used copolymers with azobenzene monomer and tolane monomer, which indicate higher birefringence, as infiltration materials into the voids. The azo-tolane copolymers were found to show the higher birefringence than azobenzene homopolymers by the linearly polarized light irradiation. Thus, the reflection band of the SiO2 inverse opal film infiltrated with the azo-tolane copolymers was shifted to long wavelength region more than 55 nm by the irradiation of linearly polarized light.

Paper Details

Date Published: 27 August 2008
PDF: 10 pages
Proc. SPIE 7050, Liquid Crystals XII, 705014 (27 August 2008); doi: 10.1117/12.794633
Show Author Affiliations
Masaki Moritsugu, Kumamoto Univ. (Japan)
Tomomi Shirota, Kumamoto Univ. (Japan)
Shoichi Kubo, Tokyo Institute of Technology (Japan)
Sun-nam Kim, Kumamoto Univ. (Japan)
Tomonari Ogata, Kumamoto Univ. (Japan)
Takamasa Nonaka, Kumamoto Univ. (Japan)
Osamu Sato, Kyushu Univ. (Japan)
Seiji Kurihara, Kumamoto Univ. (Japan)

Published in SPIE Proceedings Vol. 7050:
Liquid Crystals XII
Iam Choon Khoo, Editor(s)

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