A compact T-branch beam splitter based on anomalous reflection in two-dimensional photonic crystals  

作　　者：沈义峰 孙建 沈晓鹏 王娟 孙露露 韩奎 王国中 

机构地区：[1]Department of Physics,China University of Mining and Technology [2]Department of Physics,China University of Mining and Technology,Xuzhou 221008 [3]School of Physics and telecommunication,Wenzhou University

出　　处：《Chinese Optics Letters》2008年第10期709-712,共4页中国光学快报（英文版）

基　　金：the Science Foundation of China University of Mining and Technology under Grant No.OK061065

摘　　要：We project a compact T-branch beam splitter with a micron scale using a two-dimensional （2D） photonic crystal （PC）. For TE polarization, one light beam can be split into two sub-beams along opposite directions. The propagating directions of the two splitting beams remain unchanged when the incident angle varies in a certain range. Coupled-mode theory is used to analyze the truncating interface structure in order to investigate the energy loss of the splitter. Simulation results and theoretical analysis show that choosing an appropriate location of the truncating interface （PC-air interface） is very important for obtaining high efficiency due to the effect of defect modes. The most advantage of this kind of beam splitter is being fabricated and integrated easily.We project a compact T-branch beam splitter with a micron scale using a two-dimensional （2D） photonic crystal （PC）. For TE polarization, one light beam can be split into two sub-beams along opposite directions. The propagating directions of the two splitting beams remain unchanged when the incident angle varies in a certain range. Coupled-mode theory is used to analyze the truncating interface structure in order to investigate the energy loss of the splitter. Simulation results and theoretical analysis show that choosing an appropriate location of the truncating interface （PC-air interface） is very important for obtaining high efficiency due to the effect of defect modes. The most advantage of this kind of beam splitter is being fabricated and integrated easily.

关 键 词：Crystal atomic structure CRYSTALLOGRAPHY Electric network analysis Energy dissipation Optical instruments Particle beams PHOTONICS Powders PRISMS Silicon on insulator technology STEREOCHEMISTRY Two dimensional 

分 类 号：TN25[电子电信—物理电子学]