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Self-reference plasmonic sensors based on double Fano resonances.
Yujia Wang1, Chengwei Sun, Hongyun Li
1State Key Laboratory for Mesoscopic Physics, Collaborative Innovation Center of Quantum Matter, Department of Physics, Peking University, Beijing 100871, China. jjchern@pku.edu.cn.
Nanoscale
|July 26, 2017
Summary
This study introduces a self-reference plasmonic sensor using double Fano resonances. It offers high accuracy and stability for refractive index sensing in challenging environments.
Area of Science:
- Plasmonics
- Nanophotonics
- Sensor Technology
Background:
- High-sensitivity plasmonic refractive index sensors are crucial for diagnostics, safety, and monitoring.
- Environmental and instrumental instabilities limit the practical application of current sensors.
Purpose of the Study:
- To develop a self-reference plasmonic sensor that overcomes environmental limitations.
- To enhance detection accuracy by mitigating light intensity fluctuations and temperature variations.
Main Methods:
- Utilizing independent double Fano resonances in a metallic grating structure.
- Employing numerical simulations to understand Fano resonance origins and independence.
- Experimental demonstration of the self-reference sensing mechanism.
Main Results:
- Achieved a high figure of merit (FOM) of 31 RIU⁻¹ and FOM* of 860 RIU⁻¹ using the sensitive Fano resonance.
- Demonstrated the ability of the insensitive Fano resonance to act as a reference signal.
- Successfully monitored and eliminated errors from light intensity and temperature fluctuations.
Conclusions:
- The developed self-reference plasmonic sensor ensures high accuracy and stability in complex environments.
- This technology holds promise for sensitive and accurate sensing applications, including multi-parameter detection.
