Optical tuning and switching of photonic defect modes in cholestericliquid crystals
Optical tuning and switching of photonic defect modes in cholestericliquid crystals
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DOI：
10.1063/1.2560805
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发表时间：
2007-02
影响因子：
4
通讯作者：
H. Yoshida;Chee Heng Lee;Y. Miura;A. Fujii;M. Ozaki
中科院分区：
文献类型：
--
作者：
H. Yoshida;Chee Heng Lee;Y. Miura;A. Fujii;M. Ozaki
基于基音长度的对比，证明了胆甾液晶中光子缺陷模式的光学调谐。双光子激光光刻是在胆甾螺旋中进行的，在中心留下一个未聚合的区域，作为结构缺陷。然后用偶氮苯染料掺杂的胆甾液晶取代未聚合区域，该液晶在紫外线照射下显示出音调缩短。通过选择性地诱导胆甾液晶在缺陷处的基音缩短和改变本体与缺陷之间基音长度的对比，实现了缺陷模式的可逆转换或开关。
Optical tuning of photonic defect modes in cholesteric liquid crystals is demonstrated based on a contrast in the pitch length. Two-photon laser lithography was performed in a cholesteric helix to leave an unpolymerized region in the center to act as a structural defect. The unpolymerized region was then substituted by an azobenzene dye-doped cholesteric liquid crystal which exhibits a pitch shortening upon ultraviolet exposure. Reversible shifting or on-off switching of the defect mode was realized as a result of selectively inducing a pitch shortening of the cholesteric liquid crystal at the defect and changing the contrast in the pitch length between the bulk and defect.