▎ 摘　　要

To solve the problem of incident and controllable characteristics of the multi-band terahertz absorber, a kind of graphene-based metamaterial angle-insensitive and tunable terahertz absorber is proposed. The proposed absorber has single-band and dual-band absorption function, and profile parameters are presented by single-groove and dual-groove arrays, separately. The results show that the absorber has an absorption peak of 99.30% at 16.0 THz. In addition, the absorption of the absorber can reach 94.56% and 99.11% at 11.4 THz and 26.2 THz. Electromagnetic field energy distribution and the real and imaginary parts of the graphene surface conductivity are analyzed by the finite-element method as a function of the Fermi level and the terahertz frequency. Moreover, compared with a reported terahertz absorber, the graphene-based absorber is angle insensitive and tunable by adjusting the Fermi levels of graphene. It is believed that the proposed absorber has great potential in the fields of time-domain spectroscopy technology and imaging technology.