PHYS 82 |
| The enhancement of resonance Raman scattering by the plasmon resonance of a metal nanoparticle is developed by treating the molecule-metal interaction as transition dipole coupling between the molecular electronic transition and the much stronger optical transition of the nanoparticle. A density matrix treatment is used to account for coupling of the molecular and nanoparticle transitions to the electromagnetic field, energy transfer between the molecule-excited and nanoparticle-excited states, and dephasing processes that generate the linewidths of both transitions. This fully quantum mechanical approach reproduces the interference effects observed in extinction spectra of J-aggregated dyes adsorbed to metal nanoparticles, and makes testable predictions for surface enhanced resonance Raman profiles in systems of well defined geometry. |
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Spectroscopy, Chemistry, and Imaging through Nanophotonics
1:20 PM-5:20 PM, Sunday, April 6, 2008 Morial Convention Center -- Rm. 340/341, Oral
Division of Physical Chemistry |