Ultra-broadband terahertz metamaterial absorber based on flexible wave-absorbing material

Metamaterial absorbers (MA) in terahertz (THz) based bands are receiving much attention for its potential applications. However, the limited bandwidth greatly reduces the further development and wide application of terahertz absorbers. To solve this problem, achieving ultra-broadband and efficient absorption characteristics in the terahertz band, we propose a nickel-based microstructure ultra-broadband MA that operates in the THz band. The proposed MA's electromagnetic wave absorption characteristics and physical absorption mechanism are modeled and numerically simulated. The research demonstrates that MA can achieve ultra-wideband efficient absorption covering the whole THz spectrum (0.1 THz-16 THz) with an overall absorption rate of over 95%. The proposed absorber has polarization-insensitive characteristics and achieves a broad-angle incidence with a range of almost 80°.allows a range of incidence angles up to 80°. The MA consists of only three classical metal-dielectric layer-metal structures, which greatly reduces the application cost. The proposed ultra-thin geometry super-surface scheme uses a flexible absorbing material (ECCOSORB AN-72), and the results show that the overall absorption efficiency are significantly improved after the application of the flexible absorbing material. This design presents a unique and innovative idea for the development and use of ultrawideband terahertz absorbers across various industries including terahertz stealth, sensor technology, imaging, and communication, as well as optoelectronics. The potential applications of this technology are vast and can greatly benefit these industries.