Focused-Ion-Beam Nanofabrication of Near-Infrared Magnetic Metamaterials


  • We acknowledge the support by the Center for Functional Nanostructures (CFN) of the Deutsche Forschungsgemeinschaft (DFG) within subproject A.1.5. The research of M. W. is further supported by the DFG-Leibniz award 2000 and that of C. M. S. by the Alexander von Humboldt Senior-Scientist Award 2002, by Ames Laboratory (W-7405-Eng-82), by EU-DALHM and DARPA (MDA 972-01-2-0016).


original image

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.