Fabrication of multi-pitched photonic structure in cholesteric liquid crystals based on a polymer template with helical structure
Fabrication of multi-pitched photonic structure in cholesteric liquid crystals based on a polymer template with helical structure
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基于螺旋结构聚合物模板的胆甾型液晶多螺距光子结构的制备
DOI：
10.1039/b926670d
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发表时间：
2010-01-01
影响因子：
--
通讯作者：
Wei, Jie
中科院分区：
文献类型：
--
作者：
Guo, Jinbao;Wu, Hao;Wei, Jie
在本研究中，我们提出了一种利用聚合物模板制备具有多节距光子结构的单层Ch-LC薄膜作为新型光子带隙材料的新方法。具有螺旋结构的聚合物模板来源于聚合物稳定的液晶。随后将各种类型的Ch-LC吸收到聚合物模板中，从而产生具有不同光学特性的膜。同时反射红色、绿色和蓝色通过在Ch-LC/聚合物模板复合材料中引入具有不同双折射率的双折射液晶，并在聚合物模板中引入了一种具有很强的节距温度依赖性的氢键键合Ch-LC，并且获得了具有双手圆偏振光反射带的Ch-LC膜的温度可调谐PBG。此外，通过上述方法还实现了单层Ch-LC膜的激光发射和具有双手圆偏振光反射带的单层Ch-LC膜的图案化。这些特殊的光学性质使得这种新型的Ch-LCs复合材料在信息记录、光学元件、平板显示、光子晶体等领域具有巨大的应用潜力。
In this study, we demonstrate a novel method for fabricating a single-layer Ch-LC film with multi-pitched photonic structure as new photonic band gap (PBG) materials by utilizing a polymer template. The polymer template with helical structure was originated from polymer-stabilized cholesteric liquid crystals. Various types of Ch-LCs are subsequently imbibed into the polymer template, resulting in films with distinct optical characteristics. Simultaneous red, green and blue reflection (multiple PBGs) and wide-band reflection in a single-layer Ch-LC film can be achieved by using nematic liquid crystals with different birefringence in Ch-LCs/polymer template composites, and a H-bonded Ch-LC with a great temperature-dependence of pitch length was introduced into the polymer template, and a temperature-tunable PBG of the Ch-LC film with a double-handed circularly polarized light reflection band was obtained. Additionally, the lasing emission of a single-layer Ch-LC film and patterning of a single-layer Ch-LC film with a double-handed circularly polarized light reflection band were also realized by the above approach. These special optical properties make the novel Ch-LCs composites interesting for their great potential applications in many fields, such as information recording, optical components, flat displays, photonic crystals etc.