Double absorptions in aggregate-roughened silver surfaces

Abstract
The reflectivity from Ag surfaces, formed by overcoating Ag‐aggregated films deposited on heated substrates, shows interesting double absorptions. They appear in two distinct regions, near and beyond 1 μm and at ∼0.35 μm. The former is discussed in terms of a dipole model of the rough surfaces within the Maxwell‐Garnett aprroximation and the latter is proposed to be surface plasmon excitation.