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. 2016 Jul 8;6:29429. doi: 10.1038/srep29429

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(a) Design of the unit cell of a broadband absorber. The groove depth decreases linearly from bottom to top. Inset is the three-dimensional schematic of the unit cell. (b) Spatial k-dispersion relations of the spoof SPPs at different frequencies. (c) Photograph of the fabricated sample. (d) Comparison between the simulated and measured absorption spectra. The theoretical bandwidth from 7.5 to 14.7 GHz is highlighted by the gray region.