Effect of transition metal (Fe, Cu, Ni, Rh)-doped small silver chains on optics of plasmon resonances

Abstract

Doping can control and tune the optical properties of current nanoalloys. In this study, the optical generation of plasmon resonance mode in pure-Ag and transition metal (Fe, Cu, Ni, Rh) single-doped Ag chains is investigated using time-dependent density functional theory. Results show that the redshift of plasmon energy appears and intensity of longitudinal mode enhances with increasing the number of Ag atoms in pure silver chains. The Ag chains doped with transition metal (TM) atom create an additional peak with a local plasmon resonance mode which is related to charge redistribution in the chain around TM atom.