中国激光, 2019, 46 (1): 0113001, 网络出版: 2019-01-27
含矩形腔的MIM波导耦合T型腔结构Fano共振传感特性研究 下载: 896次
Fano Resonance Sensing Characteristics of MIM Waveguide Coupled T-Shaped Cavity Structure with Rectangular Cavity
表面光学 表面等离子激元 波导 矩形腔 T型腔 Fano共振 surface optics surface plasmon polaritons waveguide rectangular cavity T-shaped cavity Fano resonance
摘要
基于表面等离激元在亚波长结构的传播特性, 提出了一种含矩形腔的金属-介质-金属(MIM)波导与T型腔耦合的结构。T型腔形成的较窄离散态与矩形腔形成的较宽连续态相互耦合, 经过干涉相消形成Fano共振。采用耦合模理论, 分析了Fano共振的形成机理; 运用有限元分析法对该结构进行模拟仿真, 分析结构参数对其折射率传感特性的影响。结果表明, 经过结构参数的优化, 其优质因子可达6.04×104, 灵敏度为1120 nm/RIU, 该研究结果可为光子回路的集成及纳米级传感器的设计提供理论参考。
Abstract
A T-shaped cavity coupled metal-insulator-metal (MIM) waveguide structure with a rectangle cavity is proposed based on the transmission characteristics of surface plasmon polaritons (SPPs) in a sub-wavelength structure. The Fano resonance occurs due to the destructive interference between the narrow discrete state formed by the T-shaped cavity and the broad continuous state formed by the rectangular cavity. The coupled mode theory (CMT) is adopted to analyze the formation mechanism of Fano resonance. The finite element method is used to simulate this structure and analyze the influences of structural parameters on its refractive index sensing characteristics. The results show that after the optimization of structural parameters, its figure of merit is 6.04×104, and the sensitivity is 1120 nm/RIU. This research can provide a theoretical reference for the integration of photonic circuits and the design of nanoscale sensors in the future.
陈颖, 许扬眉, 高新贝, 曹景刚, 谢进朝, 朱奇光, 李少华. 含矩形腔的MIM波导耦合T型腔结构Fano共振传感特性研究[J]. 中国激光, 2019, 46(1): 0113001. Chen Ying, Xu Yangmei, Gao Xinbei, Cao Jinggang, Xie Jinchao, Zhu Qiguang, Li Shaohua. Fano Resonance Sensing Characteristics of MIM Waveguide Coupled T-Shaped Cavity Structure with Rectangular Cavity[J]. Chinese Journal of Lasers, 2019, 46(1): 0113001.