Fig. 1. Schematic of model structure

Fig. 2. (a) Absorption spectrum of the graphene metamaterial slab; (b) absorptance of graphene metamaterial slab versus d2; (c) absorptance of graphene metamaterial slab versus Ef; (d) absorptance of graphene metamaterial slab versus ε2

Fig. 3. Absorption spectrum of the compound structure on special parameters

Fig. 4. Absorption spectra of the compound structure with different W2

Fig. 5. Absorption spectra of the compound structure with different Fermi energies

Fig. 6. Absorption spectra of the compound structure with different d2

Fig. 7. Absorption spectra of the compound structure with different ε2

Fig. 8. Absorption spectra of the compound structure with different W1

Fig. 9. Absorption spectra of the compound structure with different d2 and incident angles

Fig. 10. Contour plot of absorption with different wavelengths and incident angles