Journal
OPTICS COMMUNICATIONS
Volume 284, Issue 16-17, Pages 4022-4027Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2011.04.015
Keywords
Cholesteric liquid crystals; Defect; Photonic crystals; Chromaticity
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Funding
- IVO, Shanghai Jiao Tong University [A2687B]
- National Natural Science Foundation of China [61007025, 60906039, 11004037]
- Shanghai Natural Science Foundation [09ZR1414800]
- Shanghai Shuguang program [09SG13]
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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.
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