Photoinduced two-dimensional gratings based on dye-doped cholesteric liquid crystal films

被引：24
|
作者：
Yeh, Hui-Chen [1 ]
Chen, Guang-Hao [1 ]
Leea, Chia-Rong [1 ]
Mo, Ting-Shan [1 ]
机构：
[1] Natl Cheng Kung Univ, Inst Electroopt Sci & Engn, Tainan 701, Taiwan
来源：
JOURNAL OF CHEMICAL PHYSICS | 2007年 / 127卷 / 14期
关键词：
D O I：
10.1063/1.2798103
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
This work elucidates photoinduced two-dimensional (2D) gratings in dye-doped cholesteric liquid crystal films. The helical pitch is increased by green-beam-induced trans-cis isomerization and a concomitant thermal effect. Two-dimensional gratings appear when the green beam is turned off. Grating formation results from elastic instability caused by restored strain arising from helical pitch reduction. Grating lifetime increases as green beam intensity increases and declines under irradiation with a strong red beam. Variation in grating spacing with green intensity with various pitches is also examined. (c) 2007 American Institute of Physics.
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页数：4
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