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O: Oberflächenphysik
O 17: Zeitaufgelöste Spektroskopie I
O 17.8: Talk
Tuesday, March 25, 2003, 13:00–13:15, FOE/ORG
Radiation damping of Mie-Plasmons in silver nano-particles — •C. Wiemann1, M. Wessendorf1, R. Porath1, M. Bauer1, M. Aeschlimann1, F.R. Aussenegg2, and H. Ditlbacher2 — 1Dep. of Physics, University Kaiserslautern, D-67663 Kaiserslautern — 2Institute for Experimental Physics , Karl-Franzens University, A-8010 Graz
In metal particles of nanometer size it is possible to excite localized collective excitations of the electron gas, so-called Mie-plasmons. In a recent publication, A. Liebsch predicts that under certain conditions the plasmon dephasing time at off-resonance excitation can be longer than on resonance due to the wavelength dependence of radiation damping [1]. Using time-resolved 2PPE we investigated these kinds of excitations in elliptically shaped silver nano-particles under resonant and off-resonant conditions. First results confirming Liebsch’s theory will be shown.
[1] M. Scharte, R. Porath, T. Ohms, M. Aeschlimann, J.R. Krenn, H. Ditlbacher, F.R. Aussenegg, A. Liebsch: Appl Phys B 73, 305-310 (2001)