Ultra-compact graphene plasmonic filter integrated in a waveguide  

作　　者：Baoxin Liao Xiangdong Guo Hai tlu Ning Liu Ke Chen Xiaoxia Yang Qing Dail, 廖宝鑫;郭相东;胡海;刘宁;陈科;杨晓霞;戴庆(Division of Nanophotonics,CAS Center for Excellence in Nanoscience,National Center for Nanoscience and Technology,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]Division of Nanophotonics, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China [2]University of Chinese Academy of Sciences, Beijing 100049, China

出　　处：《Chinese Physics B》2018年第9期108-113,共6页中国物理B（英文版）

基　　金：Project supported by the National Basic Key Research Program of China(Grant No.2015CB932400);the National Key Research and Development Program of China(Grant No.2016YFA0201600);the National Natural Science Foundation of China(Grant Nos.51372045,11504063,and 11674073);the Key Program of the Bureau of Frontier Sciences and Education,Chinese Academy of Sciences(Grant No.QYZDBSSW-SLH021);the Science and Technology Projects of Beijing City,China(Grant No.Z161100002116016)

摘　　要：Graphene plasmons have become promising candidates for deep-subwavelength nanoscale optical devices due to their strong field confinement and low damping. Among these nanoscale optical devices, band-pass filter for wavelength selection and noise filtering are key devices in an integrated optical circuit. However, plasmonic filters are still oversized because large resonant cavities are needed to perform frequency selection. Here, an ultra-compact filter integrated in a graphene plasmonic waveguide was designed, where a rectangular resonant cavity is inside a graphene nanoribbon waveguide. The properties of the filter were studied using the finite-difference time-domain method and demonstrated using the analytical model. The results demonstrate the band-pass filter has a high quality factor（20.36） and electrically tunable frequency response. The working frequency of the filter could also be tuned by modifying the cavity size. Our work provides a feasible structure for a graphene plasmonic nano-filter for future use in integrated optical circuits.Graphene plasmons have become promising candidates for deep-subwavelength nanoscale optical devices due to their strong field confinement and low damping. Among these nanoscale optical devices, band-pass filter for wavelength selection and noise filtering are key devices in an integrated optical circuit. However, plasmonic filters are still oversized because large resonant cavities are needed to perform frequency selection. Here, an ultra-compact filter integrated in a graphene plasmonic waveguide was designed, where a rectangular resonant cavity is inside a graphene nanoribbon waveguide. The properties of the filter were studied using the finite-difference time-domain method and demonstrated using the analytical model. The results demonstrate the band-pass filter has a high quality factor（20.36） and electrically tunable frequency response. The working frequency of the filter could also be tuned by modifying the cavity size. Our work provides a feasible structure for a graphene plasmonic nano-filter for future use in integrated optical circuits.

关 键 词：graphene plasmons plasmonic filter 

分 类 号：TN713[电子电信—电路与系统]