High degree simplification and tunable absorption features of terahertz metamaterial absorber

Abstract

Abstract This work demonstrated to attain quad-band absorption in the terahertz frequency region with simple structure of single sized resonator. The design model composed of an H type resonator placed above on a middle layer (dielectric medium) and a metallic layer at the bottom. The single sized resonator strongly interacts with incident electromagnetic wave resulting four near perfect absorption peaks. The proposed design has the advantage to achieve not only quad-band absorption but also has high degree of simplification which is different from the previous work reported. Moreover, actively adjustable absorption properties could be further noticed by interpolate vanadium dioxide (VO2) with conductivity flexibility into the design structure due to which the quad-band absorption spectra showing a switchable function by variation in the state phase of VO2 from insulator to metallic phase. The adjustment property of VO2 from insulated to metal phase is the essential aspect to acquire the adjustment of absorption properties. Therefore, the design structure could have wide range of potential THz technology related field applications.