Abstract
Surface-enhanced Raman scattering (SERS) describes the huge enhancement of the Raman intensity by plasmonic near-fields. The authors investigate SERS caused by a localized surface plasmon by coupling a plasmonic gold nanodimer with the nonresonant Raman scatterer graphene. They perform comprehensive Raman scattering experiments on the coupled system to understand polarization and wavelength dependence of plasmonic enhancement. Remarkably, the near-field resonance from Raman scattering differs by almost 0.2 eV from the far-field resonance measured by dark-field spectroscopy, which is well beyond the expected difference. Graphene is an excellent material to fundamentally study the effects and interactions that give rise to SERS.
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