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Science 19 November 2004:
Vol. 306. no. 5700, pp. 1351 - 1353
DOI: 10.1126/science.1105371
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Reports

Magnetic Response of Metamaterials at 100 Terahertz

Stefan Linden,1 Christian Enkrich,2 Martin Wegener,1,2 Jiangfeng Zhou,3 Thomas Koschny,3,4 Costas M. Soukoulis3,4*

An array of single nonmagnetic metallic split rings can be used to implement a magnetic resonance, which arises from an inductor-capacitor circuit (LC) resonance, at 100-terahertz frequency. The excitation of the LC resonance in the normal-incidence geometry used in our experiments occurs through the coupling of the electric field of the incident light to the capacitance. The measured optical spectra of the nanofabricated gold structures come very close to the theoretical expectations. Additional numerical simulations show that our structures exhibit a frequency range with negative permeability for a beam configuration in which the magnetic field couples to the LC resonance. Together with an electric response that has negative permittivity, this can lead to materials with a negative index of refraction.

1 Institut für Nanotechnologie, Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft, D-76021 Karlsruhe, Germany.
2 Institut für Angewandte Physik, Universität Karlsruhe (TH), Wolfgang-Gaede-Straße 1, D-76131 Karlsruhe, Germany.
3 Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.
4 Institute of Electronic Structure and Laser (IESL), Foundation for Research and Technology-Hellas (FORTH), 71110 Heraklion, Crete, Greece.

* To whom correspondence should be addressed. E-mail: soukoulis{at}ameslab.gov

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