Raman spectroscopy enhanced by a nearby structured surface, commonly through local plasmonic fields and adsorbate-specific electronic interactions. Enhancement of a signal per molecule does not alone determine a detection limit.
A change in Raman response from adsorption-induced electronic coupling or charge-transfer resonance, distinct from enhancement of the external optical field alone.
Enhancement of molecular excitation and Raman emission by the local optical response of a nanostructure. Pump and emitted frequencies both enter the enhancement factor.
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Surface-enhanced Raman spectroscopy (SERS) is a powerful analytical technique that enhances the Raman scattering signals of molecules adsorbed on rough metallic surfaces or nanostructures. This technique capitalizes on the properties of surface plasmons—coherent oscillations of electrons at the surface of metals—that significantly increase the intensity of Raman signals.