Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 72: Plasmonics and Nanooptics VI
O 72.4: Vortrag
Donnerstag, 25. März 2010, 15:45–16:00, H32
Photoemission Microscopy with Surface Plasmon Polaritons — Niemma Buckanie1, Nicolai Raß1, 2, Pierre Kirschbaum1, Michael Horn-von Hoegen1, and •Frank-J. Meyer zu Heringdorf1 — 1Universität Duisburg-Essen, Fakultät für Physik and Center for Nanointegration (CeNIDE), Lotharstrasse 1, 47057 Duisburg, Germany — 2present address: E.ON Gastransport GmbH, 45141 Essen, Germany
The interaction of frequency doubled femtosecond laser pulses with Silver provides a fantastic opportunity to study surface plasmon polariton (SPP) phenomena in Ag nanostructures. In two photon photoemission microscopy (2PPE PEEM) using femtosecond laser pulses, SPPs are imaged as a superposition of the electric field of the travelling SPP wave with the electric field of the laser pulse that hits the surface under grazing incidence. As the SPP and the fs laser pulse travel at different speeds, a moiré pattern is formed across the island that can be directly imaged in 2PPE PEEM. The period and orientation of the moiré pattern are influenced by the angle between the propagation direction of the SPP wave and the projection of the direction of incidence of the laser pulse into the surface plane. In a pump-probe experiment, where two coherent fs laser pulses are mutually time-delayed, it is possible to shift the moiré pattern across the island, to visualize the propagation of the SPP, and to control the location of maximum intensity behind the particle.
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