title: Enlarging the negative-index bandwidth of optical metamaterials by hybridized plasmon resonances.
abstract: By exploiting the concept of internal surface plasmon polariton (I-SPP) resonances, which appear at nonsingle metallic film stacks, we have designed a metamaterial showing a negative effective index within a large frequency bandwidth. The designed structure consists of an arrangement of several fishnet layers. By properly adjusting the lattice and the thickness of the dielectric slab of the fishnet, an I-SPP mode can be excited at a certain frequency, giving rise to a negative permeability. Thus, when combining several fishnet layers, each one configured to excite an I-SPP at a slightly different frequency, the coupling among the fishnet layers will cause a plasmon hybridization effect that enables us to extend the negative-index bandwidth.
authors.affiliation: Nanophotonics Technology Center, Universidad Politécnica de Valencia, 46022 Valencia, Spain. ruormo@ntc.upv.es
authors.forename: R
authors.initials: R
authors.lastname: Ortuño
authors.forename: C
authors.initials: C
authors.lastname: García-Meca
authors.forename: F J
authors.initials: FJ
authors.lastname: Rodríguez-Fortuño
authors.forename: A
authors.initials: A
authors.lastname: Martínez