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This work presents the experimental demonstration of total absorption by ametal-dielectric metasurface. Following the theoretical proposal [A.D\'iaz-Rubio et al. Phys. Rev. B 89, 245123 (2014)], we fabricated ametasurface consisting of a low absorbing dielectric layer (made of FR4)deposited on top of a metallic surface patterned with a square distribution ofcoaxial cavities. For P-polarized waves, it is observed a low frequency peakwith perfect absorption. The behavior of this peak has been experimentallycharacterized for different dielectric layer thicknesses, coaxial cavitylengths and incidence angles. The experimental results are in excellentagreement with numerical simulation and support the previous theoreticalfindings.

Experimental evidence of total absorption by a thin absorbing layer deposited on a patterned metallic surface