Regensburg 2007 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 5: Nanostructures at Surfaces I (Wires, Tubes)

O 5.5: Vortrag

Montag, 26. März 2007, 12:15–12:30, H36

Two-dimensional Routing of Surface Plasmon Polaritons — •Liviu Chelaru and Frank Meyer zu Heringdorf — Universität Duisburg-Essen, Lotharstrasse 1, 47048 Duisburg

We investigated the excitation and propagation of Surface Plasmon Polaritons (SPPs) in single-crystalline Ag nanostructures of arbitrary shapes and sizes by photoelectron emission microscopy (PEEM). Here the photoelectrons are generated by femtosecond laser pulses through a nonlinear two-photon photoemission (2PPE) process. Under these conditions the SPP wave is visualized as a result of interference (beat pattern) between the primary laser pulse and the traveling SPP at the sample surface. We will show that the propagation length of the SPP wave depends on the size of the Ag nanostructures, and that it can extend for several micrometers along the surface. By comparing nanostructures of different geometry, we describe the guiding of the SPP wave, and the coupling of the light into and out of the nanostructures. Depending on the incidence angle of the propagating SPP wave on the nanostructure*s boundary, we observe either trapping of the SPP wave inside the metallic nanostructure or a photoemission yield enhancement in the vicinity of the nanostructure caused by the electric field of the SPP wave.