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Refractive Index and Alcohol-Concentration Sensor Based on Fano Phenomenon
Qiang Wang1,2,3, Shubin Yan2,3, Jilai Liu2
1School of Electrical and Control Engineering, North University of China, Taiyuan 030051, China.
Sensors (Basel, Switzerland)
|November 11, 2022
Summary
This study introduces a novel nano-refractive index sensor utilizing Fano resonance. The metal-insulator-metal (MIM) waveguide and V-ring cavity sensor achieves high sensitivity and figure of merit (FOM) for precision measurements.
Area of Science:
- Nanophotonics
- Optical Sensors
- Metamaterials
Background:
- Fano resonance in plasmonic structures enables high-sensitivity sensing.
- Metal-insulator-metal (MIM) waveguides offer compact and efficient optical confinement.
- Achieving a high figure of merit (FOM) is crucial for precise refractive index sensing.
Purpose of the Study:
- To propose and analyze a novel nano-refractive index sensor based on Fano resonance.
- To investigate the role of structural asymmetry in Fano resonance splitting.
- To enhance the figure of merit (FOM) of the sensor for improved performance.
Main Methods:
- Utilized the finite element method (FEM) for numerical simulations.
- Designed a sensor comprising a metal-insulator-metal (MIM) waveguide and a V-ring cavity with a groove (VRCG).
- Analyzed the relationship between structural asymmetry, Fano resonance splitting, and sensor performance metrics.
Main Results:
- Geometric asymmetry was identified as the primary driver of Fano resonance splitting.
- Reduced Fano bandwidth in splitting mode led to a substantial improvement in FOM.
- Achieved a high sensitivity of 2765 nm/RIU and an FOM of 50.28.
- Demonstrated successful application in alcohol concentration detection with a sensitivity of approximately 150.
Conclusions:
- The proposed VRCG-based MIM sensor effectively utilizes Fano resonance for high-performance refractive index sensing.
- Structural asymmetry is a key design parameter for optimizing Fano resonance and sensor FOM.
- The sensor shows significant potential for precision measurements in solution concentration detection.
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