▎ 摘　　要

NOVELTY - The invention claims a broadband adjustable absorber based on I-shaped hollowed-out graphite. the absorber is designed based on metamaterial, the metamaterial is sequentially of a metal layer from bottom to top, the middle medium layer and the top layer I-shaped hollow graphene pattern are designed according to the fixed unit period, the structure upper layer I-shaped hollow graphene pattern is periodically arranged in the x and y direction, the bottom metal film, the middle medium layer and the top layer I-shaped hollow graphene are jointed with each other. The invention mainly calculates the absorption spectrum of the analogue terahertz wave band absorber through time domain finite difference method, optimizing the absorber structure, realizing a broadband absorption effect in the 2.4THz-4.3THz band, the absorption rate is more than 95 %, the 1.9Thz; bandwidth is The invention as the absorber has the flexible and tunable advantages, the amplitude value and the absorption width of the graphene external voltage can effectively tune the absorption rate. In addition, the invention has simple structure, can be made by conventional method, avoids the complex process, large geometric size and so on.