Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 11: Plasmonics and Nanooptics I

O 11.4: Vortrag

Montag, 14. März 2011, 15:45–16:00, PHY C213

Photoemission Microscopy on Surface Plasmon Polaritons in Ag Islands — Niemma Buckanie, Pierre Kirschbaum, Simon Sindermann, Michael Horn-von Hoegen, and •Frank Meyer zu Heringdorf — Universität Duisburg-Essen, Fakultät für Physik and Center for Nanointegration (CeNIDE), Lotharstrasse 1, 47057 Duisburg, Germany

The interaction of frequency doubled femtosecond laser pulses with Silver islands on Si in a photoemission electron microscope provides a fantastic toolbox to study the interaction of light with surface plasmon polaritons (SPP) in small Ag islands. In two photon photoemission microscopy (2PPE PEEM), SPPs are imaged as a time-integrated superposition of the electric field of the propagating SPP wave with the electric field of the exciting laser pulse that hits the surface under grazing incidence. A quantitative analysis of the experimentally observed moiré pattern allows studying of the SPP field strength and a determination of the propagation direction of the SPP. At the rear edge of the island the SPP wave can be converted back into light. The resulting superposition of the converted light with the incident laser pulse is manifested in an enhanced photoemission yield behind the island.