Broadband optically transparent absorber and multi-band stealth based on organic metasurface

Optically transparent microwave absorbers and multi-band stealth have extensive potential applications in military defense and wireless communication fields, and thus have attracted considerable attention. So far, most related work is based on inorganic transparent conductive metasurfaces. In this paper, we proposed and experimentally demonstrated a flexible, broadband and optically transparent microwave absorber using organic metasurface. The metasurface absorber is composed of a sandwich structure, in which electric resonances and magnetic resonances are induced resulting in broadband absorption. A spraying process is developed to prepare this metasurface absorber. Both simulation and experiment show that this metasurface has broadband microwave absorption and good optical transparency. We further found that by using a multi-layer structure, visible, radar, and infrared stealth (multi-band stealth) can be achieved simultaneously. With the advantages of good foldability and low cost, the proposed metasurfaces may have applications in military and wireless communication fields.