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The optical properties of thin films of silver deposited on clean and oxidized aluminium are studied. On clean aluminium, silver is growing monolayer after monolayer. The absorption edge is shifted to greater energies for the lowest thicknesses, and reaches the bulk position for coverage of several monolayers. On oxidized aluminium silver atoms form clusters, and we follow the gradual change of the absorption edge. Moreover, two optical absorption bands are observed, and interpreted as electro-magnetic resonances caused by collective electronic oscillations in the clusters

COMPARATIVE STUDY OF THE OPTICAL PROPERTIES OF SILVER CLUSTERS AND SILVER CONTINUOUS OVERLAYERS ON ALUMINIUM SUBSTRATE BY DIFFERENTIAL REFLECTOMETRY