Dresden 2011 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 26: High Frequency Magnetic Light-Matter Interaction - Invited Talk
MA 26.1: Hauptvortrag
Mittwoch, 16. März 2011, 10:15–10:45, HSZ 04
Magnetic light-matter interaction at highest frequencies — •Tobias Kampfrath1,2,3, Alexander Sell1, Matteo Burresi3, Dries van Oosten3, Manfred Fiebig4, Susumu Noda5, Martin Wolf2, Alfred Leitenstorfer1, Kobus Kuipers3, and Rupert Huber1 — 1University of Konstanz, Germany — 2Fritz Haber Institute, Berlin, Germany — 3AMOLF, Amsterdam, The Netherlands — 4HISKP, Bonn, Germany — 5University of Kyoto, Japan
In light-matter interactions at terahertz or even optical frequencies, the magnetic component of light usually plays a negligible role. Here, we consider two exceptions to this rule.
First, we use intense sub-picosecond electromagnetic pulses at terahertz frequencies to launch and stop a spin precession in the antiferromagnet NiO. The Zeeman coupling between the spins and the magnetic field of the terahertz pulse is enhanced by the spin-wave resonance at 1 THz. This scheme allows for an ultrafast spin control with minimum impact on other degrees of freedom of the solid [see also T. Kampfrath et al., Nature Photon., doi:10.1038/nphoton.2010.259].
Second, we consider an optical analog of electron paramagnetic resonance and study the interaction between a metal ring (diameter 300 nm) and a nano-photonic cavity at telecom frequencies of 200 THz. We observe a blue-shift of the cavity resonance when the ring is above an antinode of the magnetic field of the cavity. This shift allows us to determine the magnetic polarizability of the nano-ring. We discuss how this method could be applied to even smaller objects such as atoms [see also M. Burresi et al., Phys. Rev. Lett. 105, 123901 (2010)].