Journal
NANO LETTERS
Volume 12, Issue 3, Pages 1660-1667Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl3000453
Keywords
Fano resonance; surface-enhanced Raman scattering (SERS); plastron; hot spot; cluster
Categories
Funding
- National Science Foundation Major Research Instrumentation (MRI) [ECCS-1040478]
- Defense Threat Reduction Agency (DTRA) [HDTRA1-11-1-0040]
- National Security Science and Engineering Faculty Fellowship (NSSEFF) [N00244-09-1-0067]
- Air Force Office of Scientific Research
- Robert A. Welch Foundation [C-1220, C-1222]
- FWO of Flanders
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1040478] Funding Source: National Science Foundation
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While the far field properties of Fano resonances are well-known, clusters of plasmonic nanoparticles also possess Fano resonances with unique and spatially complex near field properties. Here we examine the near field properties of individual Fano resonant plasmonic clusters using surface-enhanced Raman scattering (SEAS) both from molecules distributed randomly on the structure and from dielectric nanoparticles deposited at specific locations within the cluster. Cluster size, geometry, and interparticle spacing all modify the near field properties of the Fano resonance. For molecules, the spatially dependent SERS response obtained from near field calculations correlates well with the relative SERS intensities observed for individual clusters and for specific Stokes modes of a para-mercaptoaniline adsorbate. In all cases, the largest SERS enhancement is found when both the excitation and the Stokes shifted wavelengths overlap the Fano resonances. In contrast, for SERS from carbon nanoparticles we find that the dielectric screening introduced by the nanoparticle can drastically redistribute the field enhancement associated with the Fano resonance and lead to a significantly modified SERS response compared to what would be anticipated from the bare nanocluster.
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