Coupling of Defect Modes in Cholesteric Liquid Crystals Separated by Isotropic Polymeric Layers
Shaohua Gao,
Yanzi Zhai,
Xinzheng Zhang,
Xiao Song,
Jiayi Wang,
Irena Drevensek-Olenik,
Romano A. Rupp,
Jingjun Xu
Affiliations
Shaohua Gao
The MOE Key Laboratory of Weak-Light Nonlinear Photonics, TEDA Institute of Applied Physics and School of Physics, Nankai University, Tianjin 300457, China
Yanzi Zhai
The MOE Key Laboratory of Weak-Light Nonlinear Photonics, TEDA Institute of Applied Physics and School of Physics, Nankai University, Tianjin 300457, China
Xinzheng Zhang
The MOE Key Laboratory of Weak-Light Nonlinear Photonics, TEDA Institute of Applied Physics and School of Physics, Nankai University, Tianjin 300457, China
Xiao Song
The MOE Key Laboratory of Weak-Light Nonlinear Photonics, TEDA Institute of Applied Physics and School of Physics, Nankai University, Tianjin 300457, China
Jiayi Wang
The MOE Key Laboratory of Weak-Light Nonlinear Photonics, TEDA Institute of Applied Physics and School of Physics, Nankai University, Tianjin 300457, China
Irena Drevensek-Olenik
Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19 and Department of Complex Matter, J. Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia
Romano A. Rupp
The MOE Key Laboratory of Weak-Light Nonlinear Photonics, TEDA Institute of Applied Physics and School of Physics, Nankai University, Tianjin 300457, China
Jingjun Xu
The MOE Key Laboratory of Weak-Light Nonlinear Photonics, TEDA Institute of Applied Physics and School of Physics, Nankai University, Tianjin 300457, China
Cholesteric liquid crystal structures with multiple isotropic defect layers exhibit localized optical modes (defect modes). Coupling effects between these modes were simulated using the finite difference time domain method. Analogous to the well-known result of the tight-binding approximation in solid state physics, splitting of the defect modes takes place, as soon as the structure contains more than one defect layer. The dispersion relation of the mini-bands forming within the photonic band gap of the structure is calculated numerically. The structures might have promising applications for multiwavelength filters and low-threshold lasers.
