Fig. 1. Diagram of broadband absorb structure. (a) Schematic of complete array; (b) top view of unit

Fig. 2. Absorption and real part and imaginary part of the permittivity with different conductivities of VO₂. (a) Absorption with different conductivities of VO₂; (b) real part of permittivity with different conductivities of VO₂; (c) imaginary part of permittivity with different conductivities of VO₂

Fig. 3. Absorption curves of without VO₂, VO₂ is cross, VO₂ is four-arm, and entire absorber structure

Fig. 4. Absorption spectra under different thicknesses and tangent losses of SiO₂. (a) Absorption spectra under different thicknesses of SiO₂; (b) absorption spectra under different tangent losses of SiO₂

Fig. 5. Relative impedance at different VO₂ conductivities. (a) Real part of relative impedance; (b) imaginary part of relative impedance

Fig. 6. Surface electric field distribution at four absorption peaks. (a) f₁=1.44 THz; (b) f₂=3.89 THz; (c) f₃=6.63 THz; (d) f₄=9.03 THz

Fig. 7. Effect of incidence and polarization angles on absorption. (a) Effect of incidence angle in TE mode; (b) effect of incidence angle in TM mode; (c) effect of polarization angle in TE mode