Photonic bandgaps controllable blue phase liquid crystal

Hu-Yi Liu; Chun-Ta Wang; Chiao-Yun Hsu; Tsung-Hsien Lin

doi:10.1117/12.877325

2 February 2011 Photonic bandgaps controllable blue phase liquid crystal

Hu-Yi Liu, Chun-Ta Wang, Chiao-Yun Hsu, Tsung-Hsien Lin

Proceedings Volume 7955, Emerging Liquid Crystal Technologies VI; 795506 (2011) https://doi.org/10.1117/12.877325
Event: SPIE OPTO, 2011, San Francisco, California, United States

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.

Citation Download Citation

Hu-Yi Liu, Chun-Ta Wang, Chiao-Yun Hsu, and Tsung-Hsien Lin "Photonic bandgaps controllable blue phase liquid crystal", Proc. SPIE 7955, Emerging Liquid Crystal Technologies VI, 795506 (2 February 2011); https://doi.org/10.1117/12.877325

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