Fig. 1. (a) Structure schematic of the nano-metamaterial absorber; (b) top view of the absorber unit; (c) side view of the absorber unit

Fig. 2. (a) Top view and (b) side view of the dual hexagon unit with Au/Si/Au stack; (c) structure of dipole resonance

Fig. 3. Equivalent circuit model of the dipole resonance structure. (a) Equivalent circuit diagram of magnetic resonance; (b) equivalent circuit diagram of electric resonance

Fig. 4. (a) Transmission spectrum and (b) absorption spectrum of the dual hexagon structure with Au/Si/Au stack

Fig. 5. Absorption spectra. (a) Different structure; (b) different height h of hexagonal pillar

Fig. 6. Absorption spectra. (a) Different ring pillar height h1; (b) different period p

Fig. 7. Absorption spectra. (a) Different polarization angles; (b) different incident angles

Fig. 8. Electric field |Ex| distribution at y=0 plane. (a) λ=400 nm; (b) λ=650 nm; (c) λ=700 nm; (d) λ=1000 nm; (e) λ=1300 nm; (f) λ=1500 nm

Fig. 9. Magnetic field |Hy| distribution at y=0 plane. (a) λ=400 nm; (b) λ=650 nm; (c) λ=700 nm; (d) λ=1000 nm; (e) λ=1300 nm; (f) λ=1500 nm

Fig. 10. Electric field |Ex| distribution at z=960 nm plane. (a) λ=400 nm; (b) λ=650 nm; (c) λ=700 nm; (d) λ=1000 nm; (e) λ=1300 nm; (f) λ=1500 nm