A tunable broadband terahertz (THz) absorber is designed in this paper, which is composed of graphene, silica medium and phase change material Vanadium dioxide (VO₂). By simultaneously changing the fermi level of graphene and conductivity of VO₂, the dual-controlled absorber can be realized. The results show that the full width at half maximum of the absorption spectrum is 1.03 THz, the bandwidth with the absorptance above 90% is 0.65 THz, and the absorptance is close to 100% at 1.2 THz. Moreover, the absorptance, transmittance and reflectance of the absorber can be dynamically adjusted from 0 to 99%, 0–65%, and 0–74%, respectively. The large tunability allows the proposed absorber to be used as THz tunable filters, sensors, switches and modulators.

本文设计了一种可调谐宽带太赫兹（THz）吸收器，它由石墨烯，二氧化硅介质和相变材料二氧化钒（VO ₂）组成。通过同时改变石墨烯的费米能级和VO _2的电导率，可以实现双控吸收器。结果表明，吸收光谱的半峰全宽为1.03 THz，吸收率大于90％的带宽为0.65 THz，而在1.2 THz处的吸收率接近100％。而且，吸收体的吸收率，透射率和反射率可以分别从0到99％，0-65％和0-74％进行动态调整。大的可调谐性使所提出的吸收器可用作太赫兹可调谐滤波器，传感器，开关和调制器。