Optically tuneable blue phase photonic band gaps

被引：64

作者：

Liu, Hu-Yi ^{[1
]}

Wang, Chun-Ta ^{[1
]}

Hsu, Chiao-Yun ^{[1
]}

Lin, Tsung-Hsien ^{[1
]}

Liu, Jui-Hsiang ^{[2
]}

机构：

[1] Natl Sun Yat Sen Univ, Dept Photon, Kaohsiung 80424, Taiwan

[2] Natl Cheng Kung Univ, Dept Chem Engn, Tainan 70101, Taiwan

来源：

APPLIED PHYSICS LETTERS | 2010年 / 96卷 / 12期

关键词：

crystal structure; isomerisation; liquid crystal displays; nematic liquid crystals; optical switches; optical tuning; organic compounds; photochemistry; photonic band gap; photonic crystals; CHOLESTERIC LIQUID-CRYSTALS; AZOBENZENE; NEMATICS; RANGE;

D O I：

10.1063/1.3368119

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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.

引用

页数：3

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