▎ 摘　　要

Terahertz technology is of great significance for the development of science. The research on THz optical devices will enable us to further understand THz technology. In this paper, a High refractive index sensitivity adjustable six band absorber based on dual regulation of embedded Dirac semi metal and active graphene is proposed, which can be divided into three layers, the top layer of bulk Dirac semi metal (DBS) layer, the middle layer of graphene and the bottom layer of gold substrate. The absorber has six absorption modes, which mode I-V is located in the THz band and mode VI is located at the edge of the THz band and in the infrared band. The absorptivity of four absorption modes of the absorber is higher than 0.99, and the relative impedance of the absorber in the working area is indirectly close to the impedance value in free space, which is consistent with the classical theory. After analysis, the absorption of electromagnetic wave by the absorber mainly came from the local surface plasmon resonance caused by the light wave excitation of the plasma on the material surface and the resonance coupling between the BDS layer and the graphene layer. By tuning the physical parameters, the Fermi energy of BDS layer and graphene layer, the absorber shows strong tunability. In the sensor performance test, the absorber has high refractive index sensitivity in most modes. The superior properties of the absorber make it have high application potential in communication, biomedicine and other fields.