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Updated: Jun 29, 2025
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Optical Trapping of Plasmonic Nanoparticles for In Situ Surface-Enhanced Raman Spectroscopy Characterizations
Published on: June 23, 2022
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High-sensitivity refractive index sensor based on strong localized surface plasmon resonance.
Summary
This study introduces gold nano ring structures for plasmonic refractive index sensing. Nano square rings demonstrated superior sensitivity and figure of merit, outperforming nano circular rings.
Area of Science:
- Nanophotonics
- Plasmonics
- Biosensing
Background:
- Refractive index sensing is crucial for biochemical analysis.
- Existing plasmonic sensors face limitations in sensitivity and figure of merit.
Purpose of the Study:
- To propose and analyze novel composite structures for enhanced plasmonic refractive index sensing.
- To compare the performance of nano circular and nano square ring structures.
Main Methods:
- Utilized the finite-difference time-domain (FDTD) method for electromagnetic simulations.
- Analyzed surface plasmon resonance (SPR) modes and their sensitivity.
Main Results:
- The nano square ring composite structure exhibited five SPR modes.
- Achieved a peak sensitivity of 1600 nm/RIU and a figure of merit of 86 RIU⁻¹ in a liquid environment.
- Localized SPR modes showed superior sensing performance compared to propagating SPR modes.
Conclusions:
- The proposed nano square ring structures offer superior performance for refractive index sensing.
- These structures have significant potential for applications in biochemistry and diagnostics.
