Figure 4
From: Broadband absorption using all-graphene grating-coupled nanoparticles on a reflector

(a) Top and (b) side views of graphene-based grating-coupled spherical nanoparticles on top of the metallic mirror. The biasing bridges are not illustrated in these sub-figures. (c) 3D view of our proposed wideband absorber which is biased with the bridges. For better illustration, the supporting dielectric is not shown in this sub-figure.