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We generated arrays of silver wires with a height of one atom and an averagewidth of 11 atoms on the Si(557) surface via self assembly with local$\sqrt{3}\times\sqrt{3}$ order, and investigated the 1D plasmon formation inthem using a combination of high resolution electron loss spectroscopy with lowenergy electron diffraction. As it turned out by a series of thermal desorptionexperiments followed by adding small concentrations of Ag, pure Ag-$\sqrt{3}$ordered arrays of nanowires, separated by (113) facets, are intrinsicallysemi-metallic or semiconducting. Added Ag atoms in the range up to few percentof a monolayer result in 1D plasmon formation without any concentrationthreshold. The quantitative Ag concentration dependence of the plasmonic lossesis clearly non-linear and fully compatible with a $\sqrt{n_e}$ dependence ofthe 1D plasmon. Adsorption of traces of residual gas can have a qualitativelysimilar doping effect.

Tuning of one-dimensional plasmons by Ag-Doping in Ag-$\sqrt{3}$-ordered atomic wires