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Updated: Oct 15, 2025

Optical Trapping of Plasmonic Nanoparticles for In Situ Surface-Enhanced Raman Spectroscopy Characterizations
Published on: June 23, 2022
Unveiling the molecule-plasmon interactions in surface-enhanced infrared absorption spectroscopy
Jun Yi1, En-Ming You1, Song-Yuan Ding1
1State Key Laboratory of Physical Chemistry of Solid Surfaces (PCOSS), Collaborative Innovation Centre of Chemistry for Energy Materials (iChEM), and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
Surface-enhanced infrared absorption (SEIRA) spectroscopy uses nanostructures for ultrasensitive detection. This study reveals how plasmon-nanostructure interactions influence SEIRA spectral lineshapes, impacting chemical analysis.
Area of Science:
- Nanophotonics
- Spectroscopy
- Chemical Sensing
Background:
- Surface-enhanced infrared absorption (SEIRA) spectroscopy utilizes nanostructures for ultrasensitive chemical detection.
- Plasmon-molecule interactions in SEIRA can distort spectral lineshapes, complicating data interpretation.
- Understanding these distortions is crucial for accurate quantitative analysis in SEIRA.
Purpose of the Study:
- To investigate Fano interference between molecular vibrations and plasmons in nanostructure-based SEIRA.
- To elucidate the factors influencing SEIRA spectral lineshapes.
- To provide insights for controlling nanoscale Fano interference.
Main Methods:
- Exact electrodynamic simulations.
- Theoretical modeling of plasmon-molecule interactions.
- Analysis of molecule-nanostructure distance-dependent effects.
Main Results:
- Fano interference significantly impacts SEIRA lineshapes.
- Molecule-nanostructure distance, intermolecular interactions, and plasmon decay rates affect spectral distortions.
- Even with resonant energies, lineshape complexity arises from these factors.
Conclusions:
- Controllable Fano interference at the nanoscale is achievable.
- This work enhances the understanding of SEIRA spectral interpretation.
- Opens avenues for studying plasmon-dressed molecular states.
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