# Four-Stub Resonator-Coupled MIM Waveguide Sensor

## TL;DR

This paper introduces a new sensor design using a metal-insulator-metal waveguide and a four-stub resonator for high sensitivity and potential temperature measurement applications.

## Contribution

The novelty lies in the proposed four-stub resonator-coupled MIM waveguide sensor with high sensitivity and figure of merit.

## Key findings

- The sensor achieved a sensitivity of 2940 nm/RIU and a figure of merit of 52.5.
- The design shows potential for temperature measurement with a core parameter of 1.508 nm/°C.

## Abstract

In this design, we propose a completely new sensor structure. It features a metal–insulator–metal (MIM) waveguide and a circular four-stub resonator (CFSR). Using the finite element method, we analyzed the performance of the sensor structure. We examined the impact of different parameters and structural variations on its performance. Ultimately, we determined the optimal performance parameters for the best configuration. The modified device demonstrated a sensitivity (S) of 2940 nm/RIU and a figure of merit (FOM) of 52.5. Furthermore, this sensor design demonstrates significant potential for temperature measurement applications, with a core parameter of 1.508 nm/°C.