Song Li-tao,He Jie,Wang Hua-lei,Han Yi-ang,Li Tao.Dependence of transmission spectra on director orientation in the photonic crystal with a liquid crystal layer[J].Optoelectronics Letters,2012,8(4):277-279 Dependence of transmission spectra on director orientation in the photonic crystal with a liquid crystal layer Author Name Affiliation Song Li-tao  Physical Engineering College, Zhengzhou University, Zhengzhou 450052, China  He Jie  College of Science, Henan University of Technology, Zhengzhou 450001, China  Wang Hua-lei  Physical Engineering College, Zhengzhou University, Zhengzhou 450052, China  Han Yi-ang  Physical Engineering College, Zhengzhou University, Zhengzhou 450052, China  Li Tao  Physical Engineering College, Zhengzhou University, Zhengzhou 450052, China  Abstract:       The transmission spectra of one-dimensional (1D) photonic crystals (PCs) with parallel and twisted nematic liquid crystals (LCs) as defect layers are discussed by 4 × 4 matrix method, respectively. The results show that the photonic band gap (PBG) mainly depends on the periodic arrays of dielectric composites. The orientation of director and the symmetry of the director configuration have important influence on the location and amplitude of defect modes. The location and amplitude of defect modes can be controlled conveniently by changing the orientation of director. The symmetry of the director configuration can help us understand the defect modes spectra. Hits: 4743 Download times: 571 This work has been supported by the National Natural Science Foundation of China (No.10805040), and the Talent Introduction Program of Henan University of Technology (No.2007BS041). View Full Text    Download reader