Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 46: Time-resolved spectroscopies I
O 46.9: Vortrag
Donnerstag, 26. März 2009, 12:30–12:45, SCH A315
Observation of Surface Plasmon Propagation with Attosecond Accuracy — •Niemma Mohamadie Buckanie1, Nicolai Raß1, and Frank-Joachim Meyer zu Heringdorf1,2 — 1Universität Duisburg-Essen, Institut für Experimentelle Physik, Lotharstraße 1, 47057 Duisburg — 2Center for Nano Integration Duisburg-Essen (CeNIDE), 47057 Duisburg
Surface Plasmon Polaritons (SPP) are collective oscillations of the electron gas in metallic systems that propagate along nano-particle surfaces. SPPs can be imaged by Photoemission Electron Microscopy (PEEM), using ultra short femtosecond laser pulses [1]. For the observation of the SPP wave propagation, time resolved techniques, i.e., pump-probe techniques must be applied, where delay times of attosecond accuracy between the pump and the probe pulse are required. The necessary interferometer to generate the time delay must then be stable in the attosecond time regime for the duration of the experiments, i.e., over several hours. To achieve these requirements, we designed and built an actively stabilized Mach-Zehnder-Interferometer (MZI) that has the ability to control time delays between the pump and the probe pulse in the attosecond time regime and that has a long-time stability of 15 as. With this MZI the SPP propagation in Ag islands on Si(111) is directly observed.
[1] L.I. Chelaru and F.-J. Meyer zu Heringdorf, Surf. Sci. 601 (2007) 4541–4545