枝节直波导与开口方环耦合谐振腔的Fano谐振特性研究

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原文链接

国家科技期刊平台
NETL
NSTL
万方数据
维普

中文摘要：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。

外文标题：Study on Fano resonance characteristics of a branch straight waveguide and an open square ring coupled resonator

外文摘要：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.

外文关键词：

OptoelectronicsSurface plasmonFano resonanceResonance peakTransmission spectrum

作者：

赵小侠、刘晗、贺俊芳、李喜龙、张云哲、高雪艳、刘寒、李院院

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作者单位：

西安文理学院陕西省表面工程与再制造重点实验室,西安 710065

关键词：

光电子学表面等离子体 Fano谐振谐振峰传输谱

基金：

西安文理学院三年行动计划项目西安文理学院三年行动计划项目西安市科技计划项目2022年国家级大学生创新创业计划项目陕西省教育厅自然科学项目陕西省教育厅自然科学项目

项目编号：

21XJZZ0001-0321XJZZ0001-0622FWQY0420221108001122JK053022JK0534

出版年：

2024

DOI：

10.19855/j.1000-0364.2024.033001

原子与分子物理学报

四川大学,四川省物理学会,中国物理学会原子与分子物理专业委员会

原子与分子物理学报

北大核心

影响因子：0.296

ISSN：1000-0364

年,卷(期)：2024.41(3)

参考文献量13