▎ 摘　　要

NOVELTY - The utility model claims a tunable terahertz wave absorber based on graphene plate metamaterial; the wave absorbing device is composed of a graphene layer, a medium layer and a plane metal layer; the graphene layer is composed of single-layer net graphene; the graphene carrier concentration can be changed by the external bias voltage, which can reach the control of the absorption amplitude; The dielectric layer is composed of a first silicon dioxide layer, a silicon layer and a second silicon dioxide layer. when the terahertz wave is incident to the wave absorbing device, the graphene layer makes part of the light wave enter the medium layer; the terahertz wave is reflected in the resonant cavity composed of the medium layer for multiple times until the consumption is exhausted; and the transmission of the incident light wave is blocked by the planar metal layer. The wave absorber has simple structure, easy processing, and it can be applied to optical stealth, sensor, imaging and spectroscopy field.