Fig. 1. Structure diagram of DSM based metamaterial absorber. (a) Three-dimensional diagram; (b) top view

Fig. 2. Dielectric constant of DSM at different Fermi levels. (a) Real part; (b) imaginary part

Fig. 3. Reflection coefficient and absorption spectra, as well as relative impedance spectra of absorbers. (a) Reflection coefficient and absorption spectra; (b) relative impedance of the absorber

Fig. 4. Electromagnetic field distribution of resonance peak M₁‒M₄. (a)‒(d) magnetic field intensity H_x distributions of y-z plane; (e)‒(h) DSM surface electric field intensity E distribution of x-y plane

Fig. 5. Absorption spectra of three substructure resonators. (a) Rectangular ring resonant structure 1; (b) rectangular ring resonant structure 2; (c) circular resonant structure

Fig. 6. Influence of structural parameters on absorption spectrum. (a) Central circle radius R;(b) open ring outer length L₁; (c) open ring outer width W₁; (d) dielectric layer thickness h₂

Fig. 7. Regulation of Fermi level on absorber. (a) Absorption spectra vary with the Fermi level; (b)(c) absorption rate and resonant frequency of absorption modes M₁‒M₄ at different Fermi levels

Fig. 8. Effect of background refractive index on absorption spectra. (a) Absorption spectra with refractive index 1.00‒1.16; (b) change of center frequency with refractive index

Fig. 9. Absorption spectra in TE and TM polarization modes and at different polarization angles. (a) Absorption spectra under TE and TM incidences; (b) polarization angle dependent absorption spectra