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Magnetic metamaterials at telecommunication and visible frequencies

C. Enkrich·M. Wegener·S. Linden·S. Burger·L. Zschiedrich·F. Schmidt·J. F. Zhou·Th. Koschny·C. M. Soukoulis
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Abstract

Arrays of gold split-rings with 50-nm minimum feature size and with an LC resonance at 200-THz frequency (1500-nm 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.

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C. Enkrich, M. Wegener, S. Linden, S. Burger, L. Zschiedrich, F. Schmidt, J. F. Zhou, Th. Koschny, C. M. Soukoulis. 2005-11-07. Magnetic metamaterials at telecommunication and visible frequencies. https://doi.org/10.1103/physrevlett.95.203901

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