Darmstadt 2008 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 53: Poster Photonik
Q 53.5: Poster
Thursday, March 13, 2008, 16:30–19:00, Poster C2
Selective excitation of magnetic and electric resonances in single split-ring resonators with polarization tailored light — •Peter Banzer1, Susanne Quabis1, Ulf Peschel1, Gerd Leuchs1, Stefan Linden2, Nils Feth2, and Martin Wegener3 — 1Max Planck Research Group, Institute of Optics, Information and Photonics, Erlangen, Germany — 2Institut für Nanotechnologie, Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft, Karlsruhe, Germany — 3Institut für Angewandte Physik and DFG-Center for Functional Nanostructures, Universität Karlsruhe, Karlsruhe, Germany
Metamaterials consist of building-blocks which can be seen as artificial atoms. Especially the magnetic response of these sub-structures is important if one wants to achieve extraordinary material properties like negative permeability. Therefore we investigate experimentally the pure magnetic coupling to the magnetic resonance of single split-ring resonators (SRR) in the optical regime. Therefor we use strongly focused azimuthally polarized light. It provides an ideal polarization pattern on a sub-wavelength scale for studying the magnetic resonance behaviour of single SRRs. If a SRR is placed in the centre of the focal spot the pure longitudinal magnetic field component points perpendicular to the SRR plane. In the resonant case, the magnetic field can excite a magnetic dipole. By displacing the SRR in the focal spot, one can also couple to magnetic and electric resonances via transversal electric fields (for corresponding wavelengths). In the transmitted light, one can search for fingerprints of the excited magnetic dipole.