Compact and high-efficient wavelength demultiplexing coupler based on high-index dielectric nanoantennas  

作　　者：Jingfeng Tan Hua Pang Fengkai Meng and Jin Jiang 谭敬丰;庞画;孟凤凯;蒋进(State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University)

机构地区：State Key Laboratory for Mesoscopic Physics,School of Physics,Peking University,Beijing 100871,China

出　　处：《Chinese Physics B》2018年第9期327-332,共6页中国物理B（英文版）

基　　金：Project supported by the National Key Research and Development Program of China(Grant Nos.2017YFA0205700 and 2015CB932403);the National Natural Science Foundation of China(Grant Nos.11174062,51472057,and 21790364)

摘　　要：Wavelength demultiplexing waveguide couplers have important applications in integrated nanophotonic devices. Two of the most important indicators of the quality of a wavelength demultiplexing coupler are coupling efficiency and splitting ratio. In this study, we utilize two asymmetric high-index dielectric nanoantennas directly positioned on top of a silicon-on insulator waveguide to realize a compact wavelength demultiplexing coupler in a communication band, which is based on the interference of the waveguide modes coupled by the two nanoantennas. We add a Au substrate for further increasing the coupling efficiency. This has constructive and destructive influences on the antenna＇s in-coupling efficiency owing to the Fabry-Perot（FP） resonance in the SiO2 layer. Therefore, we can realize a wavelength demultiplexing coupler with compact size and high coupling efficiency. This coupler has widespread applications in the areas of wavelength filters,on-chip signal processing, and integrated nanophotonic circuits.Wavelength demultiplexing waveguide couplers have important applications in integrated nanophotonic devices. Two of the most important indicators of the quality of a wavelength demultiplexing coupler are coupling efficiency and splitting ratio. In this study, we utilize two asymmetric high-index dielectric nanoantennas directly positioned on top of a silicon-on insulator waveguide to realize a compact wavelength demultiplexing coupler in a communication band, which is based on the interference of the waveguide modes coupled by the two nanoantennas. We add a Au substrate for further increasing the coupling efficiency. This has constructive and destructive influences on the antenna＇s in-coupling efficiency owing to the Fabry-Perot（FP） resonance in the SiO2 layer. Therefore, we can realize a wavelength demultiplexing coupler with compact size and high coupling efficiency. This coupler has widespread applications in the areas of wavelength filters,on-chip signal processing, and integrated nanophotonic circuits.

关 键 词：wavelength demultiplexing coupler high-index dielectric nanoantenna coupling efficiency Fabry-Perot（FP） resonance 

分 类 号：TN622[电子电信—电路与系统]