ellipses that intersect perpendicularly with a circular hole dug out of the center are used as the top the middle layer is SiO2, and the top layer is gold. Based on interference theory and impedance structure, the middle layer is SiO2, and the top layer is gold. Based on interference theory and matching theory, we obtained a tunable absorber with which two bandwidths of 90% absorption reach impedance matching theory, we obtained a tunable absorber with which two bandwidths of 90% as wide as 2.32 THz from 1.87 to 4.19 THz and 2.03 THz from 8.70 to 10.73 THz under normal incidence. absorption reach as wide as 2.32 THz from 1.87 to 4.19 THz and 2.03 THz from 8.70 to 10.73 THz By changing the conductivity of the VO2, dynamic absorption control from 2% to 94% can be achieved. under normal incidence. By changing the conductivity of the VO2, dynamic absorption control from Moreover, due to the symmetry of the structure, the absorptance is insensitive to the polarization angle. 2% to 94% can be achieved. Moreover, due to the symmetry of the structure, the absorptance is We envision that our high-performance, tunable, dual broadband absorber may have potential in a insensitive to the polarization angle. We envision that our high-performance, tunable, dual vast range of applications in imaging, modulation and stealth technology. broadband absorber may have potential in a vast range of applications in imaging, modulation and stealth technoAuthor Contributions:logy. Conceptualization, X.-F.J.; formal analysis, X.-F.J.; visualization, X.-F.J.; writing, original draft preparation, X.-F.J.; writing, review and editing, X.-F.J., T.L. and Z.-H.Z.; supervision, G.-F.S. and Y.X. All of Author Contributions: Conceptualization, X.-F.J.; formal analysis, X.-F.J.; visualization, X.-F.J.; writing, original published version of the manuscript. draft preparation, X.-F.J.; writing, review and editing, X.-F.J., T.L. and Z.-H.Z.; supervision, G.-F.S. and Y.X. All of the authors discussed the results and commented on the manuscript. All authors have read and agreed to the The Strategic Priority Research Program of the Chinese Academy of Sciences, Grant No. XDB43010000. National Key published version of the manuscript. Research and Development Plan (No.2016YFB0400601). National Basic Research Program of China (973 Program) (No. 2015CB351902). National Science and Technology Major Project (2018ZX01005101-010). National Natural Science Foundation of China (Grant No. 61835011). National Natural Science Foundation of China (Grant No. U1431231). the Strategic Priority Research Program of the Chinese Academy of Sciences, Grant No. XDB43010000. National KBeeyiji nRgesSecaiernchceaanndd DTeecvhenloolpomgyenPtr oPjelacnts ((NGroa.n20t1N6oY.FZB105410100600010)1. 6N15a0ti4o2n).al Basic Research Program of China (973 Program) (No. 2015CB351902). National Science and Technology Major Project (2018ZX01005101-010). National Natural Science Foundation of China (Grant No. 61835011). National Natural Science Foundation of China (Grant No. U1431231). Key Research Projects of the Frontier Science of the Chinese Academy of Sciences (No. QYZDY-SSW-JSC004). Beijing Science and Technology Projects (Grant No. Z151100001615042).
