title: Tunable composite nanoparticle for plasmonics.
abstract: We present a numerical study of the tunability properties of a plasmonic subwavelength particle deposited on a metallic slab. The particle is composed of a metallic part, supporting a localized plasmon mode, separated from the slab by a dielectric spacer. It is shown that the position of the resonance wavelength can be modified over a large spectral range by changing either the spacer thickness by a few tens of nanometers or its susceptibility within the range of usual dielectrics. A linear relation is observed between the resonance wavelength and the spacer permittivity.
authors.affiliation: Nanaophotonics and Metrology Laboratory, Ecole Polytechique Féderale de Lausanne, Switzerland. gaetan.leveque@epfl.ch
authors.forename: Gaëtan
authors.initials: G
authors.lastname: Lévêque
authors.forename: Olivier J F
authors.initials: OJ
authors.lastname: Martin