Tunable composite nanoparticle for plasmonics.
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.
Lévêque
Gaëtan
G
Nanaophotonics and Metrology Laboratory, Ecole Polytechique Féderale de Lausanne, Switzerland. gaetan.leveque@epfl.ch
Martin
Olivier J F
OJ