原子与分子物理学报2024，Vol.41Issue(3)：98-104,7.DOI:10.19855/j.1000-0364.2024.033001
枝节直波导与开口方环耦合谐振腔的Fano谐振特性研究
Study on Fano resonance characteristics of a branch straight waveguide and an open square ring coupled resonator
摘要
Abstract
In this paper,a resonator coupled with a branched straight waveguide and an open square ring is con-structed.Based on the Fano resonance principle of Metal-Insulator-Metal(MIM)structure,the dependence of the transmission lines on the parameters of the resonant cavity is analyzed by finite element method.When the space between the open square ring and the straight waveguide is G=90 nm and the branch height H=140nm,the dual Fano resonance transmission peaks with the central wavelength of λ=746nm and 1521nm with anti-symmetric lines can be generated in the resonator structure.The results showed that the peak value of left reso-nance increases with the increase of H with the maximum value at H=140nm,and then decreases slowly with the increase of H until it disappeared.Though the height of the right resonance peak is almost unaffected by H,the transmission valleys are most affected by H.With the increase of H,the transmission valleys of the branch resonant cavity move to the direction of long wavelength,while the two transmission valleys on the right basically remain unchanged.When H=210 nm,the left Fano resonance disappears completely,leaving only the reso-nance on the right,and the resonance peak remains basically unchanged.Parametric scanning was set to observe the changes of Fano resonance.The optimal parameters were set between 1500 nm and 1700 nm,and the reso-nant coupling cavity could be used as a refractive index sensor with sensitivity of about 1496 nm/RIU and figure of merit of 60.1.This structure can provide effective basis for nanoscale refractive index sensor design.关键词
光电子学/表面等离子体/Fano谐振/谐振峰/传输谱Key words
Optoelectronics/Surface plasmon/Fano resonance/Resonance peak/Transmission spectrum分类
数理科学引用本文复制引用
赵小侠,刘晗,贺俊芳,李喜龙,张云哲,高雪艳,刘寒,李院院..枝节直波导与开口方环耦合谐振腔的Fano谐振特性研究[J].原子与分子物理学报,2024,41(3):98-104,7.基金项目
西安文理学院三年行动计划项目(21XJZZ0001-03,21XJZZ0001-06) （21XJZZ0001-03,21XJZZ0001-06）
西安市科技计划项目(22FWQY04) （22FWQY04）
2022年国家级大学生创新创业计划项目(202211080011) （202211080011）
陕西省教育厅自然科学项目(22JK0530,22JK0534) （22JK0530,22JK0534）
