Abstract
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 (${{\rm{VO}}_2}$). Due to the bright-bright mode coupling between BDS rods, the dual-band, triple-band, and four-band MAs can be realized when the ${{\rm{VO}}_2}$ 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 ${{\rm{VO}}_2}$ conductivity.
© 2022 Optica Publishing Group
Full Article | PDF ArticleMore Like This
Maoyong Cao, Tongling Wang, Lei Li, Huiyun Zhang, and Yuping Zhang
J. Opt. Soc. Am. A 37(8) 1340-1349 (2020)
Yong Gang Zhang, Rui Zhang, Lan Ju Liang, Hai Yun Yao, Xin Yan, Cheng Cheng Huang, and Ke Hao Ying
Appl. Opt. 62(3) 813-819 (2023)
Zhaoxin Li, Tongling Wang, Lingfei Qu, Huiyun Zhang, Dehua Li, and Yuping Zhang
Opt. Mater. Express 10(8) 1941-1950 (2020)