title: Effects of plasmon energetics on light emission induced by scanning tunneling microscopy.
abstract: A theoretical model of plasmon and molecular luminescence induced by scanning tunneling microscopy using a molecule-covered tip on clean metal surfaces is developed. The effects of coupling between molecular exciton and interface plasmon on the luminescence spectra are investigated for variable energy of plasmon modes by means of the nonequilibrium Green's function method. It is found that spectral features arising from interference between the processes of energy absorption by the molecule and interface plasmons appear near the energy of the excitonic mode. For the energy of plasmon above (below) the energy of excitonic mode, an additional peak structure appears in the energy range slightly below (above) the energy of the excitonic mode. Prominent peak and dip structures observed in recent luminescence experiments are interpreted by the developed theory whereby its utility in the fields of plasmonics and nanophotonics is demonstrated.
authors.affiliation: Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Miwa
authors.forename: M
authors.initials: M
authors.lastname: Sakaue
authors.forename: B
authors.initials: B
authors.lastname: Gumhalter
authors.forename: H
authors.initials: H
authors.lastname: Kasai
mesh_terms: D003198:Computer Simulation; D004735:Energy Transfer / Q000528:radiation effects; D008027:Light; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000528:radiation effects* / Q000648:ultrastructure; D016252:Microscopy, Scanning Tunneling / Q000379:methods*; D008956:Models, Chemical; D012542:Scattering, Radiation; D020349:Surface Plasmon Resonance / Q000379:methods*; D013499:Surface Properties / Q000528:radiation effects