定向耦合光子晶体偏振光分束器的设计  

Design of Photonic Crystal Polarizing Beam Spliter Based on Directional Coupling

作　　者：徐旭明[1] 乐庸炉[1] 方利广[1] 李未[1] 

机构地区：[1]南昌大学理学院,南昌330031

出　　处：《半导体光电》2009年第3期347-350,共4页Semiconductor Optoelectronics

基　　金：江西省自然科学基金项目(0612043;2007GZW2547);江西省教育厅重点项目(赣教技[2006]15号);江西省科技攻关项目

摘　　要：在只有TE模光子带隙空气孔三角晶格光子晶体研究的基础上,设计出一种全新的、结构紧凑的定向耦合光子晶体偏振光分束器。根据波导间相互耦合与自映像原理,采用时域有限差分法分析了该器件的光传输特性。研究结果表明:由于导光机制不同,TE模和TM模可通过不同的相干长度分离;两种偏振光在波长1.55μm附近透射率都达到95%以上;该器件的尺寸比传统偏振光分束器短。这些优异性能在光子晶体集成电路中有极大的应用价值。Designed is a novel and compact photonic crystal polarizing beam splitter based on directional coupling with a triangular lattice of air holes, which only exhibit photonic band gaps for transverse-electric（TE） modes. The optical propagation properties of the device have been demonstrated by finite difference time domain method according to the waveguides directional coupling and self-imaging principle. The results show that due to different guiding mechanisms, TE and TM light can be separated owing to strikingly different beat lengths; the two polarizations transmission rate will be up to 95% in the vicinity of λ=1.55 μm and the size of the device can be much shorter compared with the conventional polarizing beam splitter. These excellent properties Will be widly applied in photonic integrate circuits（PCI）.

关 键 词：光子晶体波导 自映像原理 时域有限差分法 偏振光分束器 

分 类 号：TN252[电子电信—物理电子学]