Regensburg 2007 – scientific programme

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O: Fachverband Oberflächenphysik

O 13: Symposium: Ultrafast Nanooptics II

O 13.9: Talk

Monday, March 26, 2007, 17:30–17:45, H38

Plasmon Enhanced Photoemission Microscopy — •Frank Meyer zu Heringdorf and Liviu Chelaru — Universität Duisburg-Essen, Lotharstrasse 1, 47048 Duisburg

Excitation and propagation of light in metallic nanostructures by means of plasmons is one of the most promising techniques for scaling down photonic devices to their ultimate limit. This perspective has created a tremendous interest in the interaction of light with metallic particles. Two Photon Photoemission Microscopy with femtosecond laser pulses is particularly well suited to study plasmons in small metallic nanostructures, as the existence of a plasmon enhances the nonlinear photoemission yield and provides for direct visualization of the plasmon. We use the self-organization of Ag islands and wires on various Si surfaces to form structures that act as waveguides for surface plasmon polariton waves. Such waves travel along the surface of the wires and form an interference pattern with the exciting light. Pump-Probe Microscopy allows observation of the time-dependent beating pattern of the plasmon wave that is excited by a first laser pulse and probed by a second laser pulse.