title: Hybridization in Three Dimensions: A Novel Route toward Plasmonic Metamolecules.
abstract: Plasmonic metamolecules have received much interest in the last years because they can produce a wide spectrum of different hybrid optical resonances. Most of the configurations presented so far, however, considered planar resonators lying on a dielectric substrate. This typically yields high damping and radiative losses, which severely limit the performance of the system. Here we show that these limits can be overcome by considering a 3D arrangement made from slanted nanorod dimers extruding from a silver baseplate. This configuration mimics an out-of-plane split ring resonator capable of a strong near-field interaction at the terminations and a strong diffractive coupling with nearby nanostructures. Compared to the corresponding planar counterparts, higher values of electric and magnetic fields are found (about a factor 10 and a factor 3, respectively). High-quality-factor resonances (Q ≈ 390) are produced in the mid-IR as a result of the efficient excitation of collective modes in dimer arrays.
authors.affiliation: †Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy.
authors.forename: Pierfrancesco
authors.initials: P
authors.lastname: Zilio
authors.affiliation: †Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy.
authors.forename: Mario
authors.initials: M
authors.lastname: Malerba
authors.affiliation: †Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy.
authors.forename: Andrea
authors.initials: A
authors.lastname: Toma
authors.affiliation: †Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy.
authors.forename: Remo Proietti
authors.initials: RP
authors.lastname: Zaccaria
authors.affiliation: †Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy.|‡Università degli studi di Genova, Via Balbi 5, 16126 Genova, Italy.
authors.forename: Andrea
authors.initials: A
authors.lastname: Jacassi
authors.affiliation: †Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy.
authors.forename: Francesco
authors.initials: F
authors.lastname: De Angelis
keywords: 3D metamolecule; 3D split ring; Fano lattice resonance; electromagnetic field enhancement; hollow nanoantenna; plasmon hybridization