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