▎ 摘　　要

A dual band perfect tunable graphene absorber in the terahertz range is proposed in this paper. The unit cell of the structure consists of symmetric graphene strips and a silicon layer deposited on a gold film. The structure shows a very high absorbance of 98.3% and 98.7% at 3.54THz and 5.12THz in simulations, respectively. Both the resonance wavelengths of the absorber blue shift with the increase in Fermi level of graphene. Moreover, the surface current distributions on the graphene resonator at the two resonance wavelengths are simulated to deeply understand the physical mechanism of resonance absorption. The absorber offers a new way for the applications in the terahertz range.