In this paper, a dynamically tunable terahertz absorber is proposed. The absorber consists of a gold thin film, TOPAS and a graphene patterned structure. The absorption properties of the structure was investigated theoretically by using Time-Domain Finite-Difference (FDTD) method. The results show that the absorber can achieve a broadband and a narrowband absorption. Additionally, the amplitude of the two absorption bands can be adjusted. By adjusting the Fermi Energy (EF) of graphene from 0.1 eV to 1.2 eV, the absorbance of broadband absorption can change from 72% to 95%, and the absorbance of narrowband absorption changes from 40% to 97%. The design provides a new avenue for the development of terahertz absorption and modulation devices.
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