A Tunable Terahertz Metamaterial Perfect Absorber Based on Vanadium Dioxide

In this paper, a tunable metamaterial perfect absorber based on vanadium dioxide (VO2) is designed in the terahertz frequency range. The proposed structure is simulated by the numerical method of three-dimensional Finite Difference Time Domain (FDTD). Simulation results show that the absorption spectrum of the device in the normal incidence of a plane wave light in the range of 1 THz to 12 THz, has three polarization-insensitive resonance peaks whose amplitude changes for the different conductivities of VO2 and shifts in a certain frequency range. This device also having a tolerance of 6 degrees of incidence angle can provide a relatively stable absorption spectrum.