We present a 2D square loop-shaped nanostructure, which is made of a square loop aluminum array on Al2O3 spacer and Al substrate. High absorption peaks are obtained at 3.5μm and 9μm when the incident wave is vertically. In the design of dual-band or multi-band structure, the two high absorption bands are designed to stimulate the outer magnetic excitation of the first-order and the high-order magnetic resonance wavelength. For structure design with two absorption peaks or multiple absorption peaks, the expectation bands with high absorption would be obtained in the cooperation between first-order and higher-order magnetic resonance due to the outer structure. The main absorption peak due to the inner structure may be coupled the second absorption peak due to the outer structure. Then the absorption bandwidth could be broadened and the dual-band perfect absorption effect could be obtained in this loop-shaped structure.

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