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Phys. Rev. Lett. 95, 203901 (2005) [4 pages]

Magnetic Metamaterials at Telecommunication and Visible Frequencies

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C. Enkrich1, M. Wegener1,2, S. Linden2, S. Burger3, L. Zschiedrich3, F. Schmidt3, J. F. Zhou4, Th. Koschny4, and C.  M. Soukoulis4,5
1Institut für Angewandte Physik, Universität Karlsruhe (TH), D-76131 Karlsruhe, Germany
2Institut für Nanotechnologie, Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft, D-76021 Karlsruhe, Germany
3Zuse Institute Berlin, Takustraße 7, D-14195 Berlin, Germany, and DFG Forschungszentrum Matheon, Straße des 17. Juni 136, 10623 Berlin, Germany
4Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
5Institute of Electronic Structure and Laser, FORTH and Department of Materials Science and Technology, 71110 Heraklion, Crete, Greece

Received 28 April 2005; published 7 November 2005

Arrays of gold split rings with a 50-nm minimum feature size and with an LC resonance at 200 THz frequency (1.5  μm wavelength) are fabricated. For normal-incidence conditions, they exhibit a pronounced fundamental magnetic mode, arising from a coupling via the electric component of the incident light. For oblique incidence, a coupling via the magnetic component is demonstrated as well. Moreover, we identify a novel higher-order magnetic resonance at around 370 THz (800 nm wavelength) that evolves out of the Mie resonance for oblique incidence. Comparison with theory delivers good agreement and also shows that the structures allow for a negative magnetic permeability.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.203901
DOI:
10.1103/PhysRevLett.95.203901
PACS:
42.70.−a, 42.25.−p, 78.20.Ci
 
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