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双金属挡板金属-电介质-金属波导耦合方形腔的Fano共振传感特性

Fano Resonance Sensing Characteristics of Metal-Dielectric-Metal Waveguide Coupling Square Cavity with Bimetallic Baffle

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摘要

基于表面等离激元在亚波长结构的传输特性,提出了一种含双金属挡板的金属-电介质-金属(MDM)波导耦合方形腔结构。法布里-珀罗(F-P)谐振腔产生的宽连续态与由方形谐振腔产生的窄离散态干涉相消,形成了Fano共振。基于耦合模理论,定性分析了该结构Fano共振的产生机理。利用有限元法对该结构进行了仿真,定量分析了结构参数对折射率传感特性的影响。结果表明,优化参数后该结构的折射率灵敏度高达1080 nm/RIU,优质因子高达7.35×105。

Abstract

A metal-dielectric-metal (MDM) waveguide-coupled square cavity structure with bimetallic baffle is proposed based on the transmission characteristics of surface plasmon polaritons in sub-wavelength structure. The Fano resonance is an asymmetric spectral line formed by the destructive interference between the wide continuous state generated by the Fabry-Perot (F-P) resonator and the narrow discrete state interference generated by the square cavity. Based on the coupled mode theory, the generation mechanism of the Fano resonance of the structure is qualitatively analyzed. The structure is simulated by finite element method , and the influence of structural parameters on the refractive index sensing characteristics is qualitatively analyzed. The results show that the refractive index sensitivity of the proposed structure reaches 1080 nm/RIU and the figure of merit reaches 7.35×105 after optimizing the parameters.

Newport宣传-MKS新实验室计划
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中图分类号:O436

DOI:10.3788/cjl201946.0213001

所属栏目:微纳光学

基金项目:国家自然科学基金(61201112, 61475133)、河北省自然科学基金(F2016203188,F2016203245)、中国博士后基金项目(2018M630279)、河北省高等学校科学技术研究项目(ZD2018243)。

收稿日期:2018-09-14

修改稿日期:2018-09-29

网络出版日期:2018-10-24

作者单位    点击查看

陈颖:燕山大学电气工程学院测试计量技术与仪器河北省重点实验室, 河北 秦皇岛 066004
曹景刚:燕山大学电气工程学院测试计量技术与仪器河北省重点实验室, 河北 秦皇岛 066004
许扬眉:燕山大学电气工程学院测试计量技术与仪器河北省重点实验室, 河北 秦皇岛 066004
高新贝:燕山大学电气工程学院测试计量技术与仪器河北省重点实验室, 河北 秦皇岛 066004
谢进朝:燕山大学电气工程学院测试计量技术与仪器河北省重点实验室, 河北 秦皇岛 066004
唐心亮:河北科技大学信息科学与工程学院, 河北 石家庄 050018
李少华:河北先河环保科技股份有限公司, 河北 石家庄 050000

联系人作者:唐心亮(tangxinliang@hebust.edu.cn)

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引用该论文

Chen Ying,Cao Jinggang,Xu Yangmei,Gao Xinbei,Xie Jinchao,Tang Xinliang,Li Shaohua. Fano Resonance Sensing Characteristics of Metal-Dielectric-Metal Waveguide Coupling Square Cavity with Bimetallic Baffle[J]. Chinese Journal of Lasers, 2019, 46(2): 0213001

陈颖,曹景刚,许扬眉,高新贝,谢进朝,唐心亮,李少华. 双金属挡板金属-电介质-金属波导耦合方形腔的Fano共振传感特性[J]. 中国激光, 2019, 46(2): 0213001

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