Fig. 1. Structure of light absorber

Fig. 2. Reflection of DBR and single sheet graphene

Fig. 3. Absorption of device when E_F1=E_F2=0.8 eV. (a) Absorption lines when N₂=10 and N₁ varies; (b) variations of absorptions of three absorption peaks with N₁; (c) absorption lines when N₁=6 and N₂ varies; (d) variations of absorption of three absorption peaks with N₂

Fig. 4. Electric field distributions of three OTSs when N₁=6, N₂=12, E_F1=E_F2=0.8 eV. (a) OTS 1; (b) OTS 2; (c) OTS 3

Fig. 5. Absorption of graphene with Fermi energy changes when N₁=6, N₂=15. (a) Absorption spectrum as a function of E_F1 and wavelength (E_F2=0.8 eV); (b) variations of absorption of three absorption peaks with E_F1(E_F2=0.8 eV); (c) absorption spectrum as a function of E_F2 and wavelength(E_F1=0.8eV); (d) variations of absorption of three absorption peaks with E_F2(E_F1=0.8 eV)

Fig. 6. Variations of electric field distributions of OTS 2 and OTS 3 with different E_F1. (a) E_F1=0.8 eV, OTS 2; (b) E_F1=1.4 eV, OTS 2; (c) E_F1=0.8 eV, OTS 3; (d) E_F1=1.4 eV, OTS 3

Fig. 7. Variations of electric field distributions of OTS 2 and OTS 3 with different E_F2. (a) E_F2=0.8 eV OTS 2; (b) E_F2=1.4 eV, OTS 2; (c) E_F2=0.8 eV, OTS 3; (d) E_F2=1.4 eV, OTS 3

Fig. 8. Absorption spectrum as a function of incident angle and wavelength (N₁=6, N₂=15, E_F1=0.8 eV, E_F2=1.2 eV). (a) Absorption spectrum; (b) variations of absorption of three absorption peaks with incident angle