Regensburg 2010 – scientific programme

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DS: Fachverband Dünne Schichten

DS 41: [O] Plasmonics and Nanooptics VI (Joint Session DS/O/HL)

DS 41.4: Talk

Thursday, March 25, 2010, 15:45–16:00, H32

Photoemission Microscopy with Surface Plasmon Polaritons — Niemma Buckanie¹, Nicolai Raß^{1, 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.