▎ 摘　　要

In this work, we propose a dual-band absorber in the infrared spectral region based on the periodic L-shaped graphene-black phosphorene (BP) structure. Strong and anisotropic plasmonic response were achieved by merging the benefits of isotropic plasmonic response of graphene and the anisotropic one of BP in the wavelength range of 8-22 mu m for both TE and TM polarizations. According to our numerical simulations, for TE-polarization, two absorption peaks are observed in the proposed structure, approaching 98% and 99% at 8.38 mu m and 15.13 mu m, respectively. For TM-polarization, both absorption peaks are located at 8.52 mu m and 15.54 mu m, approaching 99%; a manifestation of redshift compared with TE-polarization. Furthermore, the absorption peaks can be tuned by changing the doping levels of graphene and BP layers, as well as the geometrical parameters of our absorber. This ability is well-matched for wavelength a selective sensing application that uses refractive index variations. The sensitivity of the first and the second absorption peak of our proposed device are obtained as 2.93 (3.27) mu m and 6.18 (6.42) mu m for TE (TM) polarization, respectively. One can conclude that this hybrid graphene-BP based tunable dual-band proposed absorber with its outstanding characterizations possesses potentials applications in sensors and reflective polarizers.