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High Sensitivity Plasmonic Sensor Based on Fano Resonance with Inverted U-Shaped Resonator
Gongli Xiao1, Yanping Xu1, Hongyan Yang2,3
1Guangxi Key Laboratory of Precision Navigation Technology and Application, Guilin University of Electronic Technology, Guilin 541004, China.
Sensors (Basel, Switzerland)
|February 10, 2021
Summary
This study introduces a tunable plasmonic sensor using Fano resonators. Optimized designs achieve high sensitivity for refractive index sensing, offering a basis for next-generation nanosensors.
Area of Science:
- Plasmonics
- Nanophotonics
- Sensor Technology
Background:
- Plasmonic sensors offer high sensitivity for detecting changes in refractive index.
- Fano resonances in plasmonic structures can enhance sensing performance due to sharp spectral features.
Purpose of the Study:
- To propose and analyze a tunable plasmonic sensor based on Fano resonators in an inverted U-shaped structure.
- To achieve high sensitivity and figure of merit for refractive index sensing applications.
Main Methods:
- Numerical simulation using the finite element method (FEM).
- Analysis based on multimode interference coupled-mode theory (MICMT).
- Optimization of geometrical parameters for enhanced sensor performance.
Main Results:
- Demonstrated a tunable plasmonic sensor with sharp asymmetric Fano resonance peaks.
- Achieved a maximum sensitivity of 840 nm/RIU.
- Obtained a figure of merit (FOM) of 3.9 × 10^5.
Conclusions:
- The proposed Fano resonator design enables high-sensitivity refractive index sensing.
- The optimized structure provides a reliable theoretical foundation for developing advanced plasmonic nanosensors.
