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In this work, we show that an intense enhancement of the magnetic eld can beachieved by placing aluminum nano-hoops periodically distributed and shortly spaced on top ofa substrate. When the structure is illuminated by a plane wave propagating perpendicularly tothe substrate plane, a virtual current loop is induced between adjacent nano-hoops and leads toa plasmonic resonance that provides the strong magnetic enhancement at visible wavelengths.

Plasmonics; Metamaterials;