  Absorbing metamaterials have attracted a widespread interest but suffer from
the metallic ohmic losses that limits their Q-factor to values around 10. In
this paper, we report the engineering and experimental characterization of a
high Q dark-mode in a metasurface resulting from the coupling of several
individual nano-Fabry-Perot structures supporting low-contrast resonances. The
resulting resonance has a Q-factor above 20 and a nearly total absorption.
Moreover, we also demonstrate that several dark-mode resonances can be excited
simultaneously, by exploiting the coupling of various pairs of nano Fabry-Perot
resonators within the same subwavelength period. Finally, the resonance's
Q-factor depends monotonously on the thickness of the metasurface and can reach
values up to 85.
