SERS signals at the anti Stokes side of the excitation laser in extremely high local optical fields of silver and gold nanoclusters.
Surface-enhanced anti-Stokes Raman scattering from pumped excited vibrational levels and surface-enhanced hyper Raman scattering show a quadratic dependence on the excitation intensity and are discussed as incoherent two-photon excited Raman processes performed in strongly enhanced local optical fields of silver- or gold nanoclusters, where both effects can experience very similar electromagnetic enhancement conditions.
Kneipp
Katrin
K
Wellman Center for Photomedicine, Harvard Medical School, Boston MA, USA. kneipp@usa.net
Kneipp
Harald
H
D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D049329:Nanostructures; D012834:Silver / Q000737:chemistry*; D013059:Spectrum Analysis, Raman / Q000379:methods*; D020349:Surface Plasmon Resonance; D013499:Surface Properties
D012834:Silver; D006046:Gold