| 引用本文格式: Zhao Xiao-Xia,Liu Han,He Jun-Fang,Li Xi-Long,Zhang Yun-Zhe,Gao Xue-Yan,Liu Han,Li Yuan-Yuan. Study on Fano resonance characteristics of a branch straight waveguide and an open square ring coupled resonator [J]. J. At. Mol. Phys., 2024, 41(3): 033001 (in Chinese) [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): 033001] |
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| 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 |
| 摘要点击 102 全文点击 8 投稿时间：2022-11-19 修订日期：2022-11-28 |
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| DOI编号
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| 中文关键词
光电子学 表面等离子体 Fano谐振 谐振峰 传 输 谱 |
| 英文关键词
Optoelectronics Surface plasmon Fano resonance Resonance peak Transmission spectrum |
| 基金项目
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| 中文摘要
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| 本文构建了一个枝节直波导与带开口方环耦合谐振腔。基于金属-绝缘体-金属结构的Fano谐振原理，采用有限元法分析了该波导结构的透射谱线对谐振腔结构参数的依赖关系。在开口方环与直波导间距G=90 nm，枝节高度H=140 nm时，该谐振腔结构中可以产生中心波长分别为λ=746 nm和1521 nm具有反对称线型的双重Fano共振透射峰。研究表明：左侧谐振峰值先随H增高而升高，至H=140 nm达到最大值，之后随H增高峰值缓慢减弱，直至消失。右侧谐振峰值则几乎不受H变化影响。传输谷受H影响最大，随着H增大，枝节谐振腔的传输谷向长波长方向移动，而右侧两个传输谷基本保持不变。当H=210 nm时，左边Fano谐振完全消失，只剩下右边的谐振，且谐振峰基本保持不变。设置参数化扫描，观测Fano谐振的变化，在波长1500 nm~1700 nm之间，设置最佳参数，经拟合计算得到该谐振耦合腔可以作为一个灵敏度S为1496 nm/RIU，FOM=60.1的折射率传感器。该结构可以为纳米级折射率传感器设计提供有效依据。 |
| 英文摘要
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| In this paper, a resonator coupled with a branched straight waveguide and an open square ring is constructed. 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 resonance 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 resonance 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 1500nm and 1700nm, and the resonant 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. |
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