Regensburg 2010 – scientific programme
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O: Fachverband Oberflächenphysik
O 59: Poster Session II (Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: arrays; Nanostructures at surfaces: Wires, tubes; Nanostructures at surfaces: Other; Plasmonics and nanooptics; Metal substrates: Epitaxy and growth; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsoprtion of organic / bio molecules; Metal substrates: Adsoprtion of inorganic molecules; Metal substrates: Adsoprtion of O and/or H; Metal substrates: Clean surfaces; Density functional theory and beyond for real materials)
O 59.41: Poster
Wednesday, March 24, 2010, 17:45–20:30, Poster B1
Influence of C60-Adsorption on Surface Plasmon Polariton Properties — •Pierre Kirschbaum, Niemma M. Buckanie, Michael Horn-von Hoegen, and Frank-J. Meyer zu Heringdorf — Universität Duisburg-Essen, Fakultät für Physik, Lotharstraße 1, 47057 Duisburg
Surface Plasmon Polaritons (SPP) are collective excitations of the free electron gas in metallic systems that propagate along nanoparticle surfaces. In our experiments, SPPs are optically excited at the edges of Ag-Islands. These SPPs can be imaged by nonlinear Photoemissions Electron Microscopy (PEEM), using ultra short femtosecond laser pulses for illumination. The observed periodic pattern in PEEM relates to a time integrated superposition of the exciting laser pulse and the excited SPP-wave (beating pattern). Defects and adsorbates manipulate the observed pattern.
Here, the influence of C60-adsorption on the properties of surface plasmon polaritons is discussed. Under illumination with femtosecond laser pulses we observe a decrease of the photoemission yield with increasing coverage. Furthermore, the beating pattern wavelength changes because of a modified effective surface dielectric function. Our findings imply that the SPP-wavelength becomes shorter as a result. Finally, we observe a decrease of the intensity of the beating pattern maxima compared with the intensity of the first maximum with increasing C60 coverage. Accordingly the damping becomes stronger, which means the propagation length decreases.