Applied Physics B

, Volume 73, Issue 4, pp 305-310

Do Mie plasmons have a longer lifetime on resonance than off resonance?

  • M. ScharteAffiliated withDepartment of Physics, University of Kaiserslautern, 67663 Kaiserslautern, Germany
  • , R. PorathAffiliated withDepartment of Physics, University of Kaiserslautern, 67663 Kaiserslautern, Germany
  • , T. OhmsAffiliated withDepartment of Physics, University of Kaiserslautern, 67663 Kaiserslautern, Germany
  • , M. AeschlimannAffiliated withDepartment of Physics, University of Kaiserslautern, 67663 Kaiserslautern, Germany
  • , J.R. KrennAffiliated withInstitute for Experimental Physics, Karl-Franzens University, 8010 Graz, Austria
  • , H. DitlbacherAffiliated withInstitute for Experimental Physics, Karl-Franzens University, 8010 Graz, Austria
  • , F.R. AusseneggAffiliated withInstitute for Experimental Physics, Karl-Franzens University, 8010 Graz, Austria
  • , A. LiebschAffiliated withInstitut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich, Germany

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Abstract.

The dynamics of laser-excited electrons in elliptically shaped silver nano-particles is studied using time-resolved two-photon photo-emission. By changing the polarization of the laser pulse at a fixed frequency, a different dynamics is observed near and far from resonance. To analyze these data, the effect of radiation damping on Mie plasmons of Ag nano-particles is studied as a function of laser frequency and polarization. It is shown that the off-resonance lifetime can be shorter or longer than the lifetime at resonance, depending on the incidence conditions of the laser light and on the depolarization factors characterizing the optical response of the nano-particles.

PACS: 36.40.Gk; 61.46.+w; 78.47.+p