Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 34: Poster Session I (Graphene; Plasmonics and nanooptics; Coherence and coherent control in nanophotonics and plasmonics)

O 34.28: Poster

Dienstag, 27. März 2012, 18:15–21:45, Poster E

Plasmons in Ag-Nanowires Grown on Si (557) — •Yu Zhang, Ulrich Krieg, Christian Brand, Herbert Pfnür, and Christoph Tegenkamp — Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstrasse 2, D-30167 Hannover, Germany

We present electron energy loss spectroscopy data of wire like Ag-structures grown via self assembly of on vicinal Si(557) at a coverage of 0.3 monolayers.

Using an instrument with both high energy and high momentum resolution (ELS-LEED) we observed a linearly dispersing plasmon loss parallel to the step-edges and a plasmon loss without dispersion in perpendicular direction.

Spot profile analysis LEED (SPA-LEED) and STM measurements show that the step-structure remains unchanged and the step-edges are still undecorated after the evaporation and annealing process. Both results are strong indications for well separated nanowires with a defined width resulting in a confinement of the plasmon to the individual nanowire.

Further effects of finite wire width and of residual coupling between the wires are discussed.