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Proceedings Paper

Photonic bandgaps controllable blue phase liquid crystal
Author(s): Hu-Yi Liu; Chun-Ta Wang; Chiao-Yun Hsu; Tsung-Hsien Lin
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Paper Abstract

This study investigates an optically switchable band gap of photonic crystal that is based on an azobenzene-doped liquid crystal blue phase. The trans-cis photoisomerization of azobenzene deforms the cubic unit cell of the blue phase and shifts the photonic band gap. The fast back-isomerization of azobenzene was induced by irradiation with different wavelengths light. The crystal structure is verified using Kossel diffraction diagram. An optically addressable blue phase display, based on Bragg reflection from the photonic band gap, is also demonstrated. The tunable ranges are around red, green and blue wavelengths and exhibit a bright saturated color.

Paper Details

Date Published: 2 February 2011
PDF: 5 pages
Proc. SPIE 7955, Emerging Liquid Crystal Technologies VI, 795506 (2 February 2011); doi: 10.1117/12.877325
Show Author Affiliations
Hu-Yi Liu, National Sun Yat-Sen Univ. (Taiwan)
Chun-Ta Wang, National Sun Yat-Sen Univ. (Taiwan)
Chiao-Yun Hsu, National Sun Yat-Sen Univ. (Taiwan)
Tsung-Hsien Lin, National Sun Yat-Sen Univ. (Taiwan)

Published in SPIE Proceedings Vol. 7955:
Emerging Liquid Crystal Technologies VI
Liang-Chy Chien; Hiroshi Yokoyama, Editor(s)

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