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Composite metamaterials(CMMs) combining a subwavelength metallic hole array(i.e. one-layer fishnet structure) and an array of split-ring resonators(SRRs)on the same board are fabricated with gold films on silicon wafer. Transmissionmeasurements of the CMMs in the terahertz range have been performed. Dual-bandmagnetic resonances, namely, a LC resonance at 4.40 THz and an additionalmagnetic resonance at 8.64 THz originating from the antiparallel current inwire pairs in the CMMs are observed when the electrical field polarization ofthe incident light is parallel to the gap of the component SRR. The numericalsimulations agree well with the experimental results and further clarify thenature of the dual-band magnetic resonances.

Composite metamaterials with dual-band magnetic resonances in the terahertz frequency regime