Open AccessLocal plasmon resonances of metal-in-metal core-shells
Author(s) -
Matthew D. Arnold,
Martin G. Blaber,
Michael J. Ford
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.003186
Subject(s) - plasmon , optics , surface plasmon , ellipsoid , dipole , core (optical fiber) , cuboid , quasistatic process , materials science , surface plasmon resonance , metal , resonance (particle physics) , molecular physics , physics , atomic physics , geometry , nanotechnology , nanoparticle , mathematics , quantum mechanics , astronomy , metallurgy
We investigate the tunability and strength of the localized surface plasmons of binary metal-in-metal core-shells. Ellipsoids are used as an analytical model to show how the fill factor continuously tunes a hybridized mode between those of the constituents, suggesting the use of metal combinations with widely differing plasma frequencies for broad tunability. A quasistatic eigenmode method is used separate geometric and material parameters to facilitate prediction of hybridized dipole modes in arbitrary shapes. A modified ellipsoid model is found to adequately describe the symmetric dipole-dipole resonance of well-rounded cuboids.