Dual-band terahertz metamaterial absorber based on H-shape and double-SRR structure

Composite structures of dual-band metamaterials in the terahertz regime are proposed, which are based on the H shape and double splitting resonator (DSRR) structure. Simulation results show that it can perform absorption peaks at one resonant frequency 0.43 THz with the absorption more than 95%, and at two distinct resonant frequencies 0.84 THz with the absorption more than 85%. Furthermore, the resonance mechanism is studied using equivalent circuits, which is well agree with the simulation results. These models have the advantages of simple structure and strong resonance, which indicate potentially application in the design of multiband terahertz devices.