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O: Fachverband Oberflächenphysik
O 54: Nano-optics of metallic and semiconducting nanostructures (experiments II)
O 54.11: Vortrag
Donnerstag, 26. März 2009, 17:30–17:45, SCH A216
Spectroscopy of Individual “Artificial Atoms" — •Martin Husnik1, Nils Feth1,2, Matthias Wolfram Klein1, Michael König3, Jens Niegemann3, Kurt Busch2,3, Stefan Linden1,2, and Martin Wegener1,2 — 1Institut für Angewandte Physik, Universität Karlsruhe (TH), 76131 Karlsruhe, Germany — 2Institut für Nanotechnologie, Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft, 76021 Karlsruhe, Germany — 3Institut für Theoretische Festkörperphysik, Universität Karlsruhe (TH), 76131 Karlsruhe, Germany
Metamaterials exhibiting a magnetic response at optical wavelengths have recently attracted much attention [1]. The magnetic response depends on both the design of the individual building blocks (“artificial atoms") and on electromagnetic coupling effects between the “artificial atoms". Thus for future developments, investigation of the individual “artificial atoms" is crucial.
Here, we present absolute extinction cross-section spectra of individual split-ring resonators (SRR) measured by means of a modulation technique [2,3]. The extinction cross-section at the fundamental magnetic resonance is found to be eight times the geometrical area covered by the SRR. The experimental results are in excellent agreement with microscopic calculations and can be understood by a simple electric-circuit model.
[1] V. M. Shalaev et al., Nature Photon. 1, 41 (2007).
[2] A. Arbouet et al., Phys. Rev. Lett. 93, 127401 (2004).
[3] M. Husnik et al., Nature Photon. 2, 614 (2008).