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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
Published on: July 21, 2018
Quantifying the relationship between electric field enhancement and plasmon-driven electron transfer
MaKenna M Koble1, Renee R Frontiera1
1Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, USA.
The Journal of Chemical Physics
|July 22, 2026
Summary
Hotspots in plasmonic materials enhance light-driven reactions. However, stronger electric fields in hotspots do not necessarily increase charge transfer yields for molecules like buckminsterfullerene (C60).
Area of Science:
- Plasmonics
- Photochemistry
- Materials Science
Background:
- Plasmonic materials generate intense electromagnetic fields ('hotspots') upon light interaction.
- These hotspots can drive chemical reactions by transferring energy and charge carriers to molecules.
- A deeper mechanistic understanding of plasmon-molecule interactions is needed to optimize reaction yields.
Purpose of the Study:
- To investigate the relationship between local electric field enhancement in hotspots and charge transfer reaction yield.
- To understand how the spatial distribution of hotspots impacts plasmon-driven reactions.
- To determine if maximizing electric field enhancement in hotspots improves photoreduction yields.
Main Methods:
- Utilized diffraction-limited surface-enhanced Raman spectroscopy (SERS) microscopy.
- Mapped plasmon-driven charge transfer across ordered plasmonic substrates.
- Tracked plasmon-induced electron transfer to buckminsterfullerene (C60).
Main Results:
- Areas with the highest SERS intensity (indicating strong electric field enhancement) did not correlate with the greatest reduction of C60.
- Greater ensemble-averaged reduction of C60 was not observed in regions with the most intense hotspots.
- This suggests that extremely high electric field enhancement in hotspots does not directly translate to improved charge transfer yields.
Conclusions:
- Optimizing plasmon-driven charge transfer requires more than just creating substrates with highly enhancing hotspots.
- Factors beyond localized electric field enhancement play a crucial role in photoreduction yields.
- Future efforts should consider a holistic approach to designing plasmonic substrates for efficient photocatalysis.
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