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Refractive index sensor based on a ring with a disk-shaped cavity for temperature detection applications.
Applied Optics
|October 18, 2022
Summary
This study introduces a novel metal-insulator-metal refractive index sensor. The sensor achieves high sensitivity and figure of merit, showing potential for temperature detection.
Area of Science:
- Photonics and Nanotechnology
- Optical Sensing
Background:
- Refractive index sensors are crucial for various applications.
- Metal-insulator-metal (MIM) waveguides offer unique optical properties.
Purpose of the Study:
- To propose and analyze a novel refractive index sensor structure.
- To investigate the influence of structural parameters on sensor performance.
Main Methods:
- Theoretical analysis using the finite element method.
- Simulation of a metal-insulator-metal waveguide with a circular ring containing a disk-shaped cavity (CRDC).
Main Results:
- The disk-shaped cavity is identified as key for asymmetric Fano resonance.
- CRDC radius significantly impacts sensor performance.
- Achieved maximum sensitivity of 2240 nm/RIU and figure of merit (FOM) of 62.5.
- Demonstrated potential for temperature detection with a sensitivity of 1.186 nm/ºC.
Conclusions:
- The proposed CRDC structure enables high-performance refractive index sensing.
- The sensor design is simple and shows promise for dual-mode sensing (refractive index and temperature).
