Fano Resonance in a MIM Waveguide with Two Triangle Stubs Coupled with a Split-Ring Nanocavity for Sensing Application
Fano Resonance in a MIM Waveguide with Two Triangle Stubs Coupled with a Split-Ring Nanocavity for Sensing Application
复制标题
具有两个三角形短截线的 MIM 波导中的 Fano 共振与用于传感应用的开环纳米腔耦合
作者：
Yang Xiaoyu;Hua Ertian;Wang Mengmeng;Wang Yifei;Wen Feng;Yan Shubin
本文从理论上提出了一种紧凑型折射率纳米传感器，它由金属-绝缘体-金属(MIM)波导和圆形开环谐振腔(CSRRC)耦合而成。利用有限元方法对所设计结构的传播特性进行了分析。计算结果表明，具有两个对称三角形短节的波导的连续宽频态与CSRRC的离散窄带态相互作用，产生了Fano共振轮廓。详细研究了几何参数对传感性能的影响。最大灵敏度达到1500 nm/RIU，高优值系数为65.2。该结构在片上等离子体纳米传感器中具有广阔的应用前景。
Herein, a compact refractive index nanosensor comprising a metal- insulator- metal (MIM) waveguide with symmetric two triangle stubs coupled with a circular split-ring resonance cavity (CSRRC) is theoretically presented. An analysis of the propagation characteristics of the designed structure is discussed employing the finite element method (FEM). The calculation results revealed that a Fano resonance outline emerged, which results from an interaction between the continuous broadband state of the waveguide with two symmetric triangle stubs and the discrete narrowband state of the CSRRC. The influence of geometric parameters on sensing properties was studied in detail. The maximum sensitivity reached 1500 nm/RIU with a high figure of merit of 65.2. The presented structure has great applications for on-chip plasmonic nanosensors.