title: Radiation damping in metal nanoparticle pairs.
abstract: The radiation damping rate of plasmon resonances in pairs of spherical gold nanoparticles is calculated. The radiative line width of the plasmon resonance indicates significant far-field coupling between the nanoparticles over distances many times the particle diameter. The radiation damping of the coupled particle-plasmon mode alternates between superradiant and subradiant behavior when the particle spacing is varied. At small particle spacings where near-field coupling occurs, the radiation damping rate lies far below that of an isolated particle.
authors.affiliation: Institute of Physics (IA), RWTH Aachen University, D-52056 Aachen, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Dahmen
authors.forename: Benjamin
authors.initials: B
authors.lastname: Schmidt
authors.forename: Gero
authors.initials: G
authors.lastname: von Plessen