Abstract
A bi-tunable triple-band metamaterial absorber based on Dirac semimetal films (DSFs) and vanadium dioxide (VO2) is presented. When VO2 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 VO2 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 VO2. Moreover, the frequencies of the three absorption peaks can also be tuned by varying the Fermi energies of the DSFs.
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