Magnetic metamaterials at telecommunication and visible frequencies

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.

4 pages, 3 figures

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• Determination of Effective Permittivity and Permeability of Metamaterials from Reflection and Transmission Coefficients
• Electric coupling to the magnetic resonance of split ring resonators
• Impact of the inherent periodic structure on the effective medium description of left-handed and related meta-materials
• Resonant light interaction with plasmonic nanowire systems
• FEM Modelling of 3D Photonic Crystals and Photonic Crystal Waveguides

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