Evidence of ``twofold'' electromagnetic (EM) enhancement in surface-enhanced resonance Raman scattering (SERRS) that exhibits a SERRS enhancement factor of up to 10¹⁴ has been analyzed by comparing SERRS spectra and plasmon resonance Rayleigh scattering spectra. We identified that SERRS spectral variations are induced by selective enhancement of SERRS bands whose maxima are close to plasmon resonance maxima. The correlation between the selective enhancement of SERRS and the plasmon energy demonstrated that the variations in SERRS spectra are induced by second EM enhancement in SERRS as a result of coupling between scattering photons and plasmons.
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Itoh et al. (2007) studied this question.
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