Journal
PLASMONICS
Volume 14, Issue 6, Pages 1629-1637Publisher
SPRINGER
DOI: 10.1007/s11468-019-00958-1
Keywords
Dispersion relation; Metal nanoparticles; Localized surface plasmons; Open quantum sysytems; Plasmon damping
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Properties of plasmonic materials are associated with surface plasmons-the electromagnetic excitations coupled to coherent electron charge density oscillations on a metal/dielectric interface. Although decay of such oscillations cannot be avoided, there are prospects for controlling plasmon damping dynamics. In spherical metal nanoparticles (MNPs), the basic properties of localized surface plasmons (LSPs) can be controlled with their radius. The present paper handles the link between the sizedependent description of LSP properties derived from the dispersion relation based on Maxwell's equations and the quantum picture in which MNPs are treated as quasi-particles. Such picture, based on the reduced density matrix of quantum open systems ruled by the master equation in the Lindblad form, enables to distinguish between damping processes of populations and coherences of multipolar plasmon oscillatory states and to establish the intrinsic relations between the rates of these processes, independently of the size of MNP. The impact of the radiative and the nonradiative energy dissipation channels is discussed.
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