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We study the plasmonic properties of coupled noble-metal nanochains in thecase of different number of coupled chains and doping by differenttransition-metal (TM) atoms within the time-dependent density-functional theory(TDDFT) approach. We find that as the number of chains in the array increasesthe plasmon peak shifts from the sub-eV towards the visible range. As dopingwith TM atoms increases, the visible absorption band broadens, owing toformation of additional plasmon peaks. The optical response is very sensitiveto the type of doped atoms, their number and position; in particular, theadditional peaks are most pronounced in the case of weak doping when theycorrespond to local plasmon oscillations around the impurity atom. Theseeffects have a potential to be used in various modern technologies, fromsensors to solar cells. Most of the studies of nano-plasmon effects have beenfocused on alkali- and noble-metal systems with extended s-electron states,while it was believed that doping with TM atoms with their more localizedcharge as a rule leads to an attenuation of the plasmon modes. We demonstratethat TM atoms can play a constructive role in plasmon generation in small chainsystems, and that plasmonic modes can emerge even in some pure TM nanochains.

Tuning plasmon excitations in pure and transition metal-doped arrays of noble metal nanochains