Dynamically dual-tunable dual-band to four-band metamaterial absorbers based on bulk Dirac semimetal and vanadium dioxide

In this work, we investigate dynamically dual-tunable dual-band, triple-band, and four-band metamaterial absorbers (MAs) based on a bulk Dirac semimetal (BDS) and vanadium dioxide (VO2). Due to the bright-bright mode coupling between BDS rods, the dual-band, triple-band, and four-band MAs can be realized when the VO2 is in a fully metallic state. The average absorptivity of the absorption peaks in the three MAs reaches 97%, 98.6%, and 96.4% respectively. The physical mechanism can be explained by the radiating two-oscillator model. The resonant frequencies and absorptance intensities at absorption peaks in each MA can be dynamically tuned by varying the BDS Fermi energy and the VO2 conductivity. (c) 2022 Optica Publishing Group

Automated summary

In this work, we investigate dynamically dual-tunable dual-band, triple-band, and four-band metamaterial absorbers (MAs) based on a bulk Dirac semimetal (BDS) and vanadium dioxide (VO2). The dual-band, triple-band, and four-band MAs can be realized when the VO2 is in a fully metallic state due to the bright-bright mode coupling between BDS rods. The average absorptivity of the absorption peaks in the three MAs reaches high values. The resonant frequencies and absorptance intensities at absorption peaks in each MA can be dynamically tuned by varying the BDS Fermi energy and the VO2 conductivity.