光学学报, 2020, 40 (4): 0414001, 网络出版: 2020-02-17  

侧耦合谐振腔的多重独立可调谐Fano共振传感特性 下载: 1389次

Sensing Characteristics of Multiple Independent Tunable Fano Resonances of Side-Coupled Cavity
作者单位
1 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
2 河北先河环保科技股份有限公司, 河北 石家庄 050035
摘要
基于表面等离极化激元在亚波长结构的传输特性,提出了一种含单挡板的金属-介质-金属(MIM)波导耦合双T型谐振腔的结构。在近场耦合作用下,单挡板形成的较宽连续态与单T型腔形成的较窄离散态,经过复杂的干涉相消形成非对称的双重Fano共振峰。基于耦合模理论,研究了单挡板MIM波导耦合单T型腔Fano共振的产生机理,并采用有限元分析法对该结构进行了模拟仿真。在此基础上,研究了含双T型腔结构的四重Fano共振形成过程,分析了上下T型腔结构参数对Fano共振峰的影响。结果表明,上下T型腔产生的Fano共振峰互不影响,且由单个T型腔可以实现两个Fano共振峰独立可调谐,故含金属挡板的MIM波导耦合双T型腔结构可以实现四个Fano共振峰独立可调谐。该结构可为差动传感器和波分复用器的设计提供有效的理论参考。
Abstract
Based on the transmission characteristics of the surface plasmonic polaritons in sub-wavelength structures, a metal-insulator-metal (MIM) waveguide coupled dual T-shaped cavity with metallic baffle structure is proposed . Under the action of near-field coupling, the narrow discrete state formed by a single T-shaped cavity and the wide continuous state formed by a single baffle form the asymmetric double Fano formant through complex interference cancellation. Based on the coupled mode theory, the mechanism of Fano resonance of a MIM waveguide coupled single T-shaped cavity with single baffle structure is studied, and the structure is simulated by the finite element analysis. On this basis, the formation process of quadruple Fano resonance with double T-shaped cavity structure is studied, and the influence of upper and lower T-shaped cavity structure parameters on Fano formant is analyzed. The results show that the Fano formans generated by the upper and lower T-shaped cavities do not affect each other, and two Fano formans can be tuned independently by a single T-shaped cavity, so the MIM waveguide coupled double T-shaped cavity structure containing metal baffle can achieve four Fano formans that can be tuned independently. This structure can provide an effective theoretical reference for the design of differential sensor and wavelength division multiplexer.

陈颖, 许扬眉, 谢进朝, 高新贝, 曹景刚, 李少华. 侧耦合谐振腔的多重独立可调谐Fano共振传感特性[J]. 光学学报, 2020, 40(4): 0414001. Ying Chen, Yangmei Xu, Jinchao Xie, Xinbei Gao, Jinggang Cao, Shaohua Li. Sensing Characteristics of Multiple Independent Tunable Fano Resonances of Side-Coupled Cavity[J]. Acta Optica Sinica, 2020, 40(4): 0414001.

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