Berlin 2012 – scientific programme

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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 34.38: Poster

Tuesday, March 27, 2012, 18:15–21:45, Poster E

A SPA-LEED Study of Ag Nanowires grown on vicinal Si(557) via self-assembly — •Viktoria Meier, Ulrich Krieg, and Herbert Pfnür — Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstrasse 2, D-30167 Hannover, Germany

To be able to study plasmonic excitations on Ag-nanowires we first must find a reproducible process to prepare uniaxial nanowires of well defined width. In this work we try to measure the averaged width of the nanowires via spot profile analysis LEED (SPA-LEED).

We prepared our samples by evaporation of different amounts of silver (0.2, 0.3 and 0.5 ML) on Si(557). After a precise heating and annealing cycle a single domain system of Ag-nanowires is formed on the surface via self assembly.

Studying the so-prepared sample with SPA-LEED we show that the step-structure of the substrate remains unchanged and the step-edges remain undecorated after the evaporation process. Already at 0.3 as well as 0.5 ML the silver forms a √3 × √3 reconstruction on the (111) terraces.

To access the width of the nanowires we made a (K_∥, K_⊥) plot of the Γ-Point. We compute the terrace width from the angle between the diffraction-rods of the step-train and the (111)-structure.