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Dual-Function Meta-Grating Based on Tunable Fano Resonance for Reflective Filter and Sensor Applications
Feifei Liu1, Haoyu Jia1, Yuxue Chen1
1College Physics & Materials Science, Tianjin Normal University, Tianjin 300387, China.
Sensors (Basel, Switzerland)
|July 29, 2023
Summary
This study introduces an improved plasmonic sensor using Fano resonances for enhanced sensitivity. The novel meta-grating design significantly boosts performance for biological and chemical detection applications.
Area of Science:
- Plasmonics
- Nanophotonics
- Biosensing
Background:
- Localized surface plasmon resonance (LSPR) sensors show promise for medical, food, and environmental applications.
- Broadband spectral lineshapes in LSPR sensors limit sensitivity and widespread use.
Purpose of the Study:
- To develop an improved plasmonic sensor with enhanced sensitivity and detection capabilities.
- To overcome the limitations of broadband spectral lineshapes in LSPR-based sensors.
Main Methods:
- Fabrication of a metal-insulator-metal (MIM) meta-grating using silver nanoshells, an isolation grating mask, and a gold film.
- Exploitation of Fano resonances between LSPR and Rayleigh anomaly (RA).
- Optimization of Fano resonance by adjusting incident light angles.
Main Results:
- Achieved narrowband reflection peaks (~20 nm FWHM, ~100% reflectivity) through strong LSPR-RA coupling.
- Demonstrated a figure of merit (FOM) > 57 for biological/chemical sensing.
- Showcased a 6x and 15x higher FOM compared to RA- and LSPR-based sensors, respectively.
Conclusions:
- The developed MIM meta-grating sensor offers high-efficiency reflective filters.
- The Fano resonance-based sensor significantly enhances detection of refractive index changes for molecular bonding.
- This advanced sensor design promises broader applications in sensitive detection.
