Broadband plasmonic metamaterial absorber with fish-scale structure at visible frequencies

Abstract

We propose an ultrathin fish-scale metamaterial structure for broadband absorption with an averaged value of higher than 90% over the entire visible spectrum (400-700 nm) under normal incidence. The performance preserves under a wide range of incident angle from 0° to 60°. Light absorption of such a plasmonic metamaterial absorber (PMA) relies on the localized and delocalized surface plasmon resonances of the cascaded fish-scale meta-atoms in the structure. The PMA presents excellent structural tunability for absorption band. This study with rich finding is helpful for light harvesting with metamaterial strategy.