title: Local plasmon resonances of metal-in-metal core-shells.
abstract: 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.
authors.forename: Matthew
authors.initials: M
authors.lastname: Arnold
authors.forename: Martin
authors.initials: M
authors.lastname: Blaber
authors.forename: Mike
authors.initials: M
authors.lastname: Ford