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O: Fachverband Oberflächenphysik

O 30: Plasmonics and Nanooptics III

O 30.1: Vortrag

Dienstag, 12. März 2013, 10:30–10:45, H31

Time-resolved wave packet observation of surface plasmon polaritons provided by normal incidence photoemission electron microscopy — •Philip Kahl¹, Simon Sindermann¹, Christian Schneider², Alexander Fischer², Martin Aeschlimann², Michael Horn-von Hoegen¹, and Frank-J. Meyer zu Heringdorf¹ — ¹Faculty of Physics and Center for Nanointegration Duisburg-Essen (CeNIDE), Universität Duisburg-Essen, 47057 Duisburg — ²Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, 67663 Kaiserslautern

In order to observe surface plasmon polaritons (SPPs) in a photoemission electron microscopy (PEEM) experiment, ultrashort (sub 20 fs) laserpulses of 800 nm wavelength are directed onto a surface with plasmonic Ag or Au nanostructures. In the past, non-linear photoemission under grazing incidence was used to obtain a Moiré type contrast of propagating SPPs waves. The possibility of a light incidence normal to the surface of the sample features the prospect of a direct observation of SPP wave fronts as the observed fringes resemble the SPP wavelength. This enables us to track a surface plasmon wave packet propagating at a metal-vacuum interface directly by using phase stabilized, time-resolved experiments under normal incidence conditions. Additionally, the SPP propagation parameters like group and phase velocity as well as the propagation length are measured.