Transparent ultra-broadband absorber based on a tree seedling composite structure

Abstract In this work, we design, analyze and process an ultra-broadband absorption optical transparent metamaterials absorbing device. The simulation results show that within the 13.68–71.6 GHz frequency range, the devicereaches more than 90% absorptivity, and that transverse magnetic waves and transverse waves under a large angle of polarization and incident angle can obtain high absorption performance. Therefore the device has the perfect performance of polarization insensitivity and wide angle of incidence. The absorbing mechanism is analyzed by using the equivalent medium theory, and the theoretical results are in good agreement with the simulation results. Because of its advantages of wideband absorption, high transparency, lightweight, and easy availability, the deive has important application value in practical civil and military fields, such as electromagnetic interference, electromagnetic compatibility, super lens, invisibility cloak, solar cell device design and so on.