基于自准直效应的紧凑型光子晶体偏振分束器  

Compact Photonic Crystal Polarization Beam Splitter Based on Self-Collimation Effect

作　　者：唐哿钰 黄华茂[1,2] 王洪 TANG Ge-yu;HUANG Hua-mao;WANG Hong(Engineering Research Center for Optoelectronics of Guangdong Province,School of Physics and Optoelectronics,South China University of Technology,Guangzhou 510640,China;Engineering Research Center for Widebandgap Semiconductor Chips and Application of Guangdong Province,Zhongshan Institute of Modem Industrial Technology,South China University of Technology,Zhongshan 528437,China)

机构地区：[1]华南理工大学广东省光电工程技术研究开发中心,物理与光电学院,广东广州510640 [2]广东省宽禁带半导体芯片及应用工程技术研究中心,中山市华南理工大学现代产业技术研究院,广东中山528437

出　　处：《光学与光电技术》2021年第6期72-79,共8页Optics & Optoelectronic Technology

基　　金：广东省科技计划项目(2016B010123004、2017B010112003、2020B010171001);广州市科技计划项目(201604046021、201905010001);中山市科技发展专项基金项目(2019AG014、2019AG042、2020AG023)资助。

摘　　要：设计了一种基于二维光子晶体自准直效应和光子禁带特性的新型紧凑型偏振分束器,器件尺寸为9μm×9μm,利用光子晶体的自准直效应实现TE偏振光和TM偏振光在自准直结构中的自准直传播,基于光子禁带特性实现TE偏振和TM偏振的正交分离。对于插入的偏振分束结构的空气孔排数为5时,1550 nm处的TE偏振光的透过率为95.4%,对应的偏振消光比为23 dB,TM偏振光的透过率为88.5%,对应的偏振消光比为37 dB。对于覆盖100 nm带宽的TE和TM偏振光,TE偏振消光比和TM偏振消光比分别高于18 dB和30 dB。与以往的偏振分束器相比,结构更简单,尺寸更小,偏振消光比更高,更好地满足现代光通信、光集成系统的需求。A new compact polarization beam splitter based on the self-collimation effect of two-dimensional photonic crystals and photonic band gap characteristics is designed in this paper.The size of the entire device is 9μm×9μm.The selfcollimation effect of photonic crystals is used to realize TE polarized light and TM polarization.The self-collimation propagation of light in the self-collimation structure utilizes the photonic band gap characteristic to realize the orthogonal separation of TE polarization and TM polarization.When the number of air holes of the inserted polarization beam splitting structure is 5,the transmittance of TE polarized light at 1550 nm is 95.4%,the corresponding polarization extinction ratio is 23 dB,and the transmittance of TM polarized light is 88.5%,which corresponds to the polarization extinction ratio is 37 dB.For TE and TM polarized light covering a 100 nm bandwidth,the TE polarization extinction ratio and TM polarization extinction ratio are higher than 18 d B and 30 d B,respectively.Compared with the previous polarization beam splitter,the structure is simpler,the size is smaller,and the polarization extinction ratio is higher,which better meets the needs of modern optical communications and optical integrateion systems.

关 键 词：光子晶体 偏振分束器 自准直效应 光子禁带 偏振消光比 

分 类 号：TN256[电子电信—物理电子学]