Research on Sensing Performance of Double-Baffle MDM Waveguide Side Coupling Barb Resonator

DUAN Jiayi; SHEN Sanmin

doi:10.13756/j.gtxyj.2026.240189

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Research on Sensing Performance of Double-Baffle MDM Waveguide Side Coupling Barb Resonator

更新时间：2026-03-03

- Research on Sensing Performance of Double-Baffle MDM Waveguide Side Coupling Barb Resonator
- Study on Optical Communications Issue 1, (2026)
- 作者机构：
  
  中北大学　仪器与电子学院　仪器科学与动态测试教育部重点实验室，太原　 030051
- 作者简介：
- 基金信息：
- DOI：10.13756/j.gtxyj.2026.240189
  CLC： TN253;O436
- Received：03 September 2024，
  
  Revised：2024-09-13，
  
  Published：10 February 2026
- 稿件说明：
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段佳毅，沈三民. 双挡板MDM波导耦合倒钩形谐振腔传感性能研究[J]. 光通信研究，2026(1): 240189.

Duan J Y, Shen S M. Research on Sensing Performance of Double-Baffle MDM Waveguide Side Coupling Barb Resonator[J]. Study on Optical Communications, 2026(1): 240189.
段佳毅，沈三民. 双挡板MDM波导耦合倒钩形谐振腔传感性能研究[J]. 光通信研究，2026(1): 240189. DOI： 10.13756/j.gtxyj.2026.240189.

Duan J Y, Shen S M. Research on Sensing Performance of Double-Baffle MDM Waveguide Side Coupling Barb Resonator[J]. Study on Optical Communications, 2026(1): 240189. DOI： 10.13756/j.gtxyj.2026.240189.

摘要

目的

为了获得小尺寸、高灵敏度的折射率传感器，文章设计了一种基于表面等离子激元（SPPs）的双金属挡板金属-电介质-金属（MDM）波导侧向耦合倒钩形谐振腔结构。

方法

文章应用有限元分析法分别模拟双金属挡板MDM波导和倒钩形谐振腔的传输过程，并分别将其视作连续态和离散态。将波导结构和谐振腔耦合，即连续态和离散态发生干涉，结合磁场分布分析了两个法诺共振峰（FR1和FR2）的产生机理。通过改变几何参数并计算对应不同参数的品质因素（FOM）值绘制成表，以此确定该结构几何参数的最优值。

结果

在最优几何参数下，模拟外界环境变化，改变介质折射率，计算得到该折射率传感器的两个法诺共振峰对应的灵敏度（S）分别为1 650和1 960 nm/RIU。考虑到葡萄糖溶液可应用于多个领域，例如：医疗健康中糖尿病的检测、食品行业中酒的酿制以及环境监测中微生物的监测。将此传感器应用在葡萄糖溶液浓度的监测中，凭借两个法诺共振峰的协同监测，能有效降低系统误差。

结论

文章通过对该传感器结构参数的分析得到结论：两个法诺共振峰的传感特性可以由几何结构参数单独影响，即腔Ⅲ长度可以控制FR1，腔Ⅰ和腔Ⅱ的高度可以共同控制FR2，耦合距离可以对结构实现总体控制，并且当结构中出现了相反的能量时，结构参数变化对法诺共振峰的影响更大。根据这一传感特性，为制成可调谐折射率传感器提供了参考。

Abstract

Objective

In order to obtain a small size and high sensitivity refractive index sensor

a bimetallic baffle Metal-Dielectric-Metal (MDM) waveguide side-coupling barb cavity structure based on Surface Plasmon Polaritons (SPPs) was designed.

Methods

The transmission process of MDM waveguide and barb resonator with bimetal baffle was simulated by finite element analysis

and they were regarded as continuous state and discrete state respectively. The mechanism of the two Fano formant peaks (FR1 and FR2) is analyzed by coupling the waveguide structure with the resonator

specifically through the interference between continuous and discrete states

as well as the magnetic field distribution. By changing the geometric parameters and calculating the Figure of Merit (FOM) values corresponding to different parameters

the optimal value of the geometric parameters of the structure is determined.

Results

By simulating external environmental changes and tuning the refractive index of the medium under optimal geometric parameter settings

the sensor exhibited sensitivities (S) of 1 650 and 1 960 nm/RIU

respectively. It is considered that the inverted glucose solution can be used in many fields

such as: the detection of diabetes in healthcare

the brewing of wine in the food industry

and the monitoring of microorganisms in environmental monitoring. This sensor is applicable for glucose solution concentration monitoring

as its dual Fano formants can effectively mitigate measurement errors.

Conclusion

Through the analysis of the structural parameters of the sensor

it is concluded that the sensing characteristics of the two Fano formant peaks can be independently affected by the geometric structure parameters. It means the length of cavity Ⅲ can control FR1

the height of cavity Ⅰ and cavity Ⅱ can jointly control FR2

and the coupling distance can realize the overall control of the structure. Moreover

when the inverting energy appears in the structure

the change of structural parameters will have a greater impact on Fano. According to this sensing characteristic

this study provides a reference for the development of tunable refractive index sensors.

关键词

Keywords

references

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College of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunications

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