A Novel Triple-Band Terahertz Metamaterial Absorber Using a Stacked Structure of MoS2 and Graphene

Abstract

A MoS2 and graphene stacked structure is proposed as metamaterials for a triple-band terahertz absorber in this work. The complementary frequency-selective surface of the absorber, consisting of two crossed linear slots and four pairs of concentric circular slots, has three absorptions at 0.6 THz (99.7%), 1.5 THz (95.4%), and 2.5 THz (99.5%). The polarization of the THz absorber is less sensitive to the incident angle within a certain range. By controlling the material properties of MoS2 and graphene, the peak absorption frequency can be tuned within a certain range. The stacked structure of different 2D materials provides new ideas for the design of the THz absorber, which is important for THz in detection, communication, and imaging applications.

Dynamic switching: vanadium dioxide and graphene-based terahertz perfect absorber for tunable broadband absorption and tri-band absorption

“…The proposed absorber system is based on the classical sandwich structure with two additional metasurface structures in the dielectric layer, the top graphene metasurface is a single square graphene ring structure, the bottom graphene metasurface is a single circular graphene ring structure, and the middle metasurface structure is a VO 2 square ring. The absorber used polyethylene cyclic olefin copolymer (Topas) as the dielectric layer, which has a dielectric constant of 2.35 [44] and the loss angle tangent of 0.00007 [45]. Topas has excellent heat resistance and high stability for terahertz band applications.…”

Design of ultra-thin multi-band sub-terahertz metamaterial absorber using three concentric ring resonators with same opening direction

“…For example, a multi-band MMA consisting of symmetrically arranged snowflake-like structures could achieve three absorption peaks [52], however, its second absorption peak is only 79.22%, which may reduce the stability and reliability of the absorber. Afterward, Cai et al proposed an MMA with a complementary surface consisting of two crossed lines and four concentric rings [53], which could realize three high absorption peaks in the 0.2-3.2 THz range, while this multilayer stacking structure not only increases the manufacturing difficulty and cost, but is also susceptible to environmental and usage conditions. Recently, a novel MMA covered by two different graphene arrays has been proposed [54], the design is called Penrose models 1 and 2.…”