Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 74: Plasmonics and nanooptics IV

O 74.8: Vortrag

Donnerstag, 29. März 2012, 17:45–18:00, MA 005

Time-Resolved PEEM Investigation of the Interaction of Surface Plasmons with Hot Spots — •Martin Wiesenmayer, Alexander Fischer, Pascal Melchior, Christian Schneider, Daniela Bayer, and Martin Aeschlimann — University of Kaiserslautern, Department of Physics, 67663 Kaiserslautern, Germany

In our talk we present a spatially and time-resolved investigation of a rough, polycrystalline silver surface. The acquisition of phase resolved autocorrelation traces (hν = 1.55 eV and 3.1 eV, p- and s-polarized) enables a detailed analysis of such data, especially with respect to the interference fringes. The interaction of the laser induced surface plasmons with local hot spots on the silver surface is the focus of our work. We observe a significant broadening of the autocorrelations which exceeds the dephasing times of a smooth metal surface. Using photoemission electron microscopy (PEEM) allows for a parallel detection in the micron regime (field of view below 20 µm) which is crucial for the interpretation of the observed broadening effects. Our investigations contribute to a deeper understanding of the time dependent evolution of the local near field enhancement on rough silver surfaces, as used in surface enhanced Raman scattering (SERS).