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Surface enhanced Raman scattering arising from multipolar plasmon excitation
G Laurent1, N Félidj, J Aubard
1Laboratoire ITODYS, Université Paris 7-Denis Diderot, CNRS UMR 7086, 1 rue Guy de la Brosse, F-75005 Paris, France.
The Journal of Chemical Physics
|January 11, 2005
Summary
High multipolar plasmon resonances in gold nanorods generate significant surface-enhanced Raman scattering (SERS) signals. This finding offers new possibilities for sensitive molecular detection and spectroscopy.
Area of Science:
- Plasmonics
- Nanophotonics
- Spectroscopy
Background:
- Gold nanorods support plasmon resonances, which are collective oscillations of conduction electrons.
- Surface-enhanced Raman scattering (SERS) is a technique that dramatically amplifies Raman signals of molecules near plasmonic nanostructures.
Purpose of the Study:
- To investigate the plasmon resonances in regular arrays of gold nanorods.
- To determine the contribution of high multipolar plasmon resonances to SERS.
Main Methods:
- Fabrication of regular arrays of gold nanorods.
- Measurement of visible and near-infrared extinction spectra.
- Analysis of surface-enhanced Raman scattering (SERS) spectra.
Main Results:
- Observed several bands in extinction spectra assigned to high multipolar order plasmon resonances (up to ninth order).
- Achieved SERS enhancement factors of approximately 5 x 10(4) due to these multipolar resonances.
- Demonstrated that multipolar resonances provide SERS enhancement comparable to dipolar excitations.
Conclusions:
- High multipolar plasmon resonances in gold nanorod arrays are significant contributors to SERS.
- These findings expand the understanding of plasmonic behavior in nanostructures.
- The observed SERS enhancement opens avenues for advanced sensing applications.
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