Abstract
Terahertz (THz) absorbers have attracted considerable attention due to their potential applications. However, the limited bandwidth of THz absorbers limits their further applications. In order to achieve ultra-broadband and high absorption characteristics in the THz band, a double truncated pyramid unit structure combining the hybrid planar structure and the few-layers vertical structure is proposed. The double truncated pyramid unit structure composed of five metal layers and five graphene layers has the advantages of ultra-broadband, tunability, polarization-insensitive, wide-angle absorption. The simulation results show that the absorption coefficient of the absorber is greater than 0.9 from 1.49 THz to 12.72 THz, and the absorption bandwidth is 11.23 THz. The ultra-broadband absorption can be attributed to the size effect. The absorption mechanism can be further explained by surface current distribution and impedance matching theory.
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