Plasmon-Polariton Properties in Metallic Nanosphere Chains

The propagation of collective wave type plasmonic excitations along infinite chains of metallic nanospheres has been analyzed, including near-, medium- and far-field contributions to the plasmon dipole interaction with all retardation effects taken into account. It is proven that there exist weakly-...

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Bibliographic Details
Published in:Materials 2015-06, Vol.8 (7), p.3910-3937
Main Authors: Jacak, Witold Aleksander, Krasnyj, Jurij, Chepok, Andrej
Format: Article
Language:English
Subjects:
Approximation
Dipole interactions
Excitation
Friction
Gold
Light
Nanoparticles
Nanospheres
Nanostructure
Plasmonics
Plasmons
Propagation
Silver
Wave propagation
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Summary:The propagation of collective wave type plasmonic excitations along infinite chains of metallic nanospheres has been analyzed, including near-, medium- and far-field contributions to the plasmon dipole interaction with all retardation effects taken into account. It is proven that there exist weakly-damped self-modes of plasmon-polaritons in the chain for which the propagation range is limited by relatively small Ohmic losses only. In this regime, the Lorentz friction irradiation losses on each nanosphere in the chain are ideally compensated by the energy income from the rest of the chain. The completely undamped collective waves were identified in the case of the presence of persistent external excitation of some fragment of the chain. The obtained characteristics of these excitations fit the experimental observations well.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma8073910