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

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 degrees to 60 degrees. 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. (C) 2016 Optical Society of America.