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O: Fachverband Oberflächenphysik
O 20: Nano-optics of metallic and semiconducting nanostructures (time resolved)
O 20.2: Vortrag
Dienstag, 24. März 2009, 10:45–11:00, SCH A216
Dephasing of Optical Magnetism in Magnetic Photonic Crystals — •Michael Geiselmann1,2, Tobias Utikal1,2, Markus Lippitz1,2, and Harald Giessen1 — 14. Physikalisches Institut, Universität Stuttgart, Germany — 2Max Planck Institut für Festkörperforschung, Stuttgart, Germany
We investigate the time dynamics of optical magnetism in a magnetic photonic crystal. The structure consists of gold cut-wire pairs with a magnesium fluoride spacer on top of a HfO2 slab waveguide. In the cut-wire pair structure, a symmetric and an antisymmetric plasmonic mode can be optically excited. The antisymmetric mode is regarded as a magnetic resonance. With the correct grating period the magnetic resonance in the wires can be coupled to the photonic mode, which is excited in the slab waveguide. In the strong coupling regime, a polaritonic system is formed, termed a magnetic plasmon polariton. In the experiment we study its femtosecond time dynamics using a nonlinear third-harmonic autocorrelation technique. We find that due to the coupling to the waveguide mode the dephasing of the system can be drastically prolonged up to 60 fs. To the best of our knowledge, this is the first experimental demonstration of temporally resolved magnetism in a magnetic photonic crystal.