title: Electric and magnetic dipole coupling in near-infrared split-ring metamaterial arrays.
abstract: We present experimental observations of strong electric and magnetic interactions between split ring resonators (SRRs) in metamaterials. We fabricated near-infrared planar metamaterials with different inter-SRR spacings along different directions. Our transmission measurements show blueshifts and redshifts of the magnetic resonance, depending on SRR orientation relative to the lattice. The shifts agree well with simultaneous magnetic and electric near-field dipole coupling. We also find large broadening of the resonance, accompanied by a decrease in effective cross section per SRR with increasing density due to superradiant scattering. Our data shed new light on Lorentz-Lorenz approaches to metamaterials.
authors.affiliation: Center for Nanophotonics, FOM Institute for Atomic and Molecular Physics (AMOLF), Science Park 102, 1098 XG Amsterdam, The Netherlands. i.sersic@amolf.nl
authors.forename: Ivana
authors.initials: I
authors.lastname: Sersic
authors.forename: Martin
authors.initials: M
authors.lastname: Frimmer
authors.forename: Ewold
authors.initials: E
authors.lastname: Verhagen
authors.forename: A Femius
authors.initials: AF
authors.lastname: Koenderink