Fig. 1. Structural diagrams of proposed absorber. (a) Structure of array; (b) array period; (c) structure of absorber unit; (d) gear-shaped structure

Fig. 2. Absorption spectra of multi-layer gear-shaped metamaterial absorber and average absorptivity versus layer number. (a) Absorption spectra; (b) average absorptivity versus layer number

Fig. 3. Absorption spectra of multi-layer gear-shaped metamaterial absorber under different conditions. (a) Different polarization angles; (b) different incident angles

Fig. 4. Relative impedances of different structures. (a) Proposed MGMA; (b) absorbers with different layer numbers

Fig. 5. Electric field |E| distributions at different resonance points. (a)(d) λ=500 nm; (b)(e) λ=2340 nm; (c)(f) λ=3600 nm

Fig. 6. Electric field |E| and magnetic field |H| distributions in y=0 plane at different resonance points. (a)(d) λ=500 nm; (b)(e) λ=2340 nm; (c)(f) λ=3600 nm

Fig. 7. Influences of R_o on absorption spectra and average absorptivity. (a) Absorption spectra; (b) average absorptivity

Fig. 8. Influences of p on absorption spectra and average absorptivity. (a) Absorption spectra; (b) average absorptivity

Fig. 9. Influences of S on absorption spectra and average absorptivity. (a) Absorption spectra; (b) average absorptivity