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Phys Rev Lett. 2005 Jan 28;94(3):037402. Epub 2005 Jan 26.

Midinfrared resonant magnetic nanostructures exhibiting a negative permeability.

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Center for High Technology Materials, University of New Mexico, Albuquerque, NM 87106, USA.


We experimentally demonstrate the first midinfrared (mid-IR) resonant magnetic nanostructures exhibiting a strong magnetic response corresponding to a negative permeability. This result is an important step toward the achievement of a negative refractive index in the IR. The possibility of extending negative permeability to higher frequencies is discussed; a structure with a negative effective permeability at a near-IR resonance frequency of 230 THz (1.3 microm) is proposed.

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