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Compound photonic crystals with cholesteric liquid crystals sandwiched isotropic defect layers

He Zheng-Hong Ye Zhi-Cheng Li Zheng-Guang Cui Qing-Yu Su Yi-Kai

Compound photonic crystals with cholesteric liquid crystals sandwiched isotropic defect layers

He Zheng-Hong, Ye Zhi-Cheng, Li Zheng-Guang, Cui Qing-Yu, Su Yi-Kai
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Publishing process
  • Received Date:  19 April 2010
  • Accepted Date:  19 May 2010
  • Published Online:  15 March 2011

Compound photonic crystals with cholesteric liquid crystals sandwiched isotropic defect layers

  • 1. Displays and Lighting Center, Shanghai Jiaotong University, National Engineering Lab of TFT-LCD Materials and Technologies, Shanghai 200240, China

Abstract: Forbidden gaps of one-dimensional compound photonic crystals consisting of cholesteric liquid crystals sandwiched by periodic isotropic layers are investigated. The common forbidden gaps appear for both incident left and right polarization light which is different from the cholesteric liquid crystals. The forbidden gaps for incident left polarization light will disappear and the forbidden gaps for incident right polarization light will merge and become wider with the increasing of thickness ratio of cholesteric liquid crystals to periodic isotropic layers. The effect of forbidden gaps for incident left and right polarization light becomes obvious with the increasing of refractive index of periodic isotropic layers. The corresponding forbidden gaps for two colors of red, green and blue will appear by tuning thickness ratio of cholesteric liquid crystals to periodic isotropic layers and the refractive index of periodic isotropic layers, which can be used to fabricate reflective color filters for liquid display.

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