Reflection chromaticity of cholesteric liquid crystals with sandwiched periodical isotropic defect layers
Reflection chromaticity of cholesteric liquid crystals with sandwiched periodical isotropic defect layers
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夹有周期性各向同性缺陷层的胆甾型液晶的反射色度
DOI：
10.1016/j.optcom.2011.04.015
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发表时间：
2011-08-01
影响因子：
2.4
通讯作者：
Su, Yikai
中科院分区：
文献类型：
--
作者：
He, Zhenghong;Ye, Zhicheng;Su, Yikai
本文研究了由具有各向同性缺陷层的双折射液晶构成的一维光子晶体。基于BerremanFast4x4矩阵方法，计算了一维光子晶体的色散关系，得到了相应的反射色度。研究发现，通过调节各向同性缺陷层的厚度和折射率可以控制色偏。与传统结构相比，该结构的反射色度对入射角不敏感，只要适当地设置周期性各向同性缺陷层的折射率和周期性各向同性缺陷层的厚度比。此外，还得到了左右圆偏振的共同禁带，并考虑了折射率随波长的变化，得到了反射光色度随入射角的变化。所提出的器件可用作显示器工业中的反射式滤色器。(C)2011 Elsevier B.V.保留所有权利。
We study one-dimensional photonic crystals made of cholesteric liquid crystals with sandwiched isotropic defect layers. Based on the Berreman Fast 4 x 4 matrix method, the dispersion relation of one-dimensional photonic crystals is calculated and the corresponding reflection chromaticity is obtained. It is found that the color shift could be controlled by adjusting the thickness and refractive index of the isotropic defect layers. Compared with conventional structures, the reflection chromaticity of this structure is insensitive to the incident angle, if the thickness ratio of the cholesteric liquid crystals to that of the isotropic defect layers and the refractive index of periodical isotropic defect layers are properly set. Furthermore, the common forbidden bands for both left and right circular polarizations can be obtained, and we also take the wavelength-dependent refractive indices into consideration and obtain the reflected light chromaticity with the incident angle increasing. The proposed device can be used as a reflective color filter in the display industry. (C) 2011 Elsevier B.V. All rights reserved.