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A simple metamaterial-based wide-angle plasmonic absorber is introduced,fabricated, and experimentally characterized using angle-resolved infraredspectroscopy. The metamaterials are prepared by nano-imprint lithography, anattractive low-cost technology for making large-area samples. The matching ofthe metamaterial's impedance to that of vacuum is responsible for the observedspectrally selective "perfect" absorption of infrared light. The impedance istheoretically calculated in the single-resonance approximation, and theresponsible resonance is identified as a short-range surface plasmon. Thespectral position of the absorption peak (which is as high as 95%) isexperimentally shown to be controlled by the metamaterial's dimensions. Thepersistence of "perfect" absorption with variable metamaterial parameters istheoretically explained. The wide-angle nature of the absorber can be utilizedfor sub-diffraction-scale infrared pixels exhibiting spectrally selectiveabsorption/emissivity.

Large-area, wide-angle, spectrally selective plasmonic absorber