HE Jie,SONG Li-tao,WANG Hua-lei,HAN Yi-ang,LI Tao.Angular tuning of defect modes spectra for one dimensional photonic crystal filters with a liquid crystal layer[J].Optoelectronics Letters,2011,7(6):437-439 Angular tuning of defect modes spectra for one dimensional photonic crystal filters with a liquid crystal layer Author Name Affiliation HE Jie  College of science, Henan University of Technology；  SONG Li-tao  Physical Engineering college, Zhengzhou University；  WANG Hua-lei  Physical Engineering college, Zhengzhou University；  HAN Yi-ang  Physical Engineering college, Zhengzhou University；  LI Tao  Physical Engineering college, Zhengzhou University；  Abstract:       A tunable photonic crystal filter with a twisted nematic liquid crystal layer is proposed. The defect modes spectra with varying incident angles are discussed in detail by 4x4 matrix method. The results show that the defect modes are mainly decided by the applied voltage when the incident angle is smaller than 8o. As the incident angle further increases, the band gap and the defect modes shift toward the shorter wavelength side, and the changes of the two modes are different. In the lower voltag... Hits: 4274 Download times: 221 View Full Text    Download reader