Design of bi-tunable triple-band metamaterial absorber based on Dirac semimetal and vanadium dioxide

Abstract

A bi-tunable triple-band metamaterial absorber based on Dirac semimetal films (DSFs) and vanadium dioxide (VO 2 ) is presented. When VO 2 is in the fully metallic state, the proposed absorber presents three distinctive absorption peaks in the terahertz range with absorptance 97%. Because the conductivity of VO 2 changes from 100000 to 10 S/m, the reflectance and absorptance intensities achieve dynamic tunability at the three absorption peaks, and the proposed triple-band absorber exhibits a switchable function by the insulation-to-metal transition of VO 2 . Moreover, the frequencies of the three absorption peaks can also be tuned by varying the Fermi energies of the DSFs.