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Split-ring resonators with a magnetic resonance in the near-infrared have been fabricated using the rapid- prototyping capabilities of focused- ion-beam writing. By varying the design parameters, a continuous transition from a degenerate Mie resonance to a magnetic-dipole response is shown (see Figure). In particular, a negative magnetic permeability at a wavelength of 2.4 μm and a negative magnetic susceptibility at a wavelength of 1.7 μm are demonstrated.
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Enkrich et al. (2005) studied this question.
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