Fig. 1. Schematics of graphene–black phosphorus heterostructure. (a) Schematic of monolayer BP atom structure with armchair direction along x axis and zigzag direction along y axis. Schematic of the periodic structure consisting of GB nanoribbons along armchair direction (b) and zigzag direction (c).

Fig. 2. Simulated spectra of absorption when graphene (a), monolayer BP (b), and GB (c) nanoribbons along armchair and zigzag directions. The insets are the schematic of the cross sections of these structures.

Fig. 3. Absorption map of GB nanoribbons along (a), (c) armchair direction and (b), (d) zigzag direction with various widths.

Fig. 4. Absorption map of GB nanoribbons along (a), (c) armchair direction and (b), (d) zigzag direction with various periods.

Fig. 5. Absorption spectra for various Fermi energy of graphene for GB nanoribbons along armchair direction (a) and zigzag direction (b).

Fig. 6. Absorption spectra when nanoribbons along armchair and ziagzag directions. The distance between the graphene nanoribbons and the BP nanoribbons varies from t = 0 to 20 nm (a)–(d). Schematic of the cross section of the proposed structure is shown in the inset of (a). The insets are the side view electric field profile of the vertical component E_z at the resonance frequency for nanoribbons along armchair direction (the black rectangle is the inserting dielectric layer).