Experimental demonstration of a conformal optical metamaterial absorber

In this paper, we present the first ever experimental demonstration of a conformal optical metamaterial absorber. This metamaterial absorber, composed of a doubly periodic array of stub-loaded H-shaped nanopatches optimized by a genetic algorithm, has two polarization-insensitive and angularly-independent absorption bands at 3.3μm and 3.9μm with absorption larger than 90% up to an angle of incidence of 50°. The metamaterial structure was fabricated and characterized, showing strong agreement with theoretical predictions. Due to the Au ground plane, the performance of this metamaterial absorber is independent of the surface if covers.