2005/01/31 by Peter Johansson, Hongxing Xu, Mikael Käll +1 · 1 citation
Engineering · Materials Science · Physics and Astronomy · #Gold and Silver Nanoparticles Synthesis and Applications #Plasmonic and Surface Plasmon Research #Spectroscopy and Quantum Chemical Studies #cond-mat.other
paper · pdf · doi:10.1103/physrevb.72.035427
published as Phys. Rev. B 72, 035427 (2005). · 18 pages, 14 figures
arxiv created 2005/01/31 · openalex publication_date 2005/07/08 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present a general model study of surface-enhanced resonant Raman scattering and fluorescence, focusing on the interplay between electromagnetic (EM) effects and the molecular dynamics as treated by a density matrix calculation. The model molecule has two electronic levels, is affected by radiative and nonradiative damping mechanisms, and a Franck-Condon mechanism yields electron-vibration coupling. The coupling between the molecule and the electromagnetic field is enhanced by placing it between two Ag nanoparticles. The results show that the Raman scattering cross section can, for realistic parameter values, increase by some 10 orders of magnitude (to \ensuremath∼10^\ensuremath-14\phantom\rule0.3em0excm2) compared with the free-space case. Also the fluorescence cross section grows with increasing EM enhancement, however, at a slower rate, and this increase eventually stalls when nonradiative decay processes become important. Finally, we find that anti-Stokes Raman scattering is possible with strong incident laser intensities \ensuremath∼1\phantom\rule0.3em0exmW∕\ensuremathμm2.