title: The origin of magnetic polarizability in metamaterials at optical frequencies - an electrodynamic approach.
abstract: We explain the origin of the electric and particular the magnetic polarizabiltiy of metamaterials employing a fully electromagnetic plasmonic picture. As example we study an U-shaped split-ring resonator based metamaterial at optical frequencies. The relevance of the split-ring resonator orientation relative to the illuminating field for obtaining a strong magnetic response is outlined. We reveal higher-order magnetic resonances and explain their origin on the basis of higher-order plasmonic eigenmodes caused by an appropriate current flow in the split-ring resonator. Finally, the conditions required for obtaining a negative index at optical frequencies in a metamaterial consisting of split-ring resonators and wires are investigated.
authors: Carsten
authors: C
authors: Rockstuhl
authors: Thomas
authors: T
authors: Zentgraf
authors: Ekaterina
authors: E
authors: Pshenay-Severin
authors: Jörg
authors: J
authors: Petschulat
authors: Arkadi
authors: A
authors: Chipouline
authors: Jürgen
authors: J
authors: Kuhl
authors: Thomas
authors: T
authors: Pertsch
authors: Harald
authors: H
authors: Giessen
authors: Falk
authors: F
authors: Lederer