Abstract
A dual-band perfect optical absorber based on the graphene/hexagonal boron nitride van der Waals hybrid structure is proposed in the mid-infrared band. According to the results of the finite-difference time-domain method, dual-band perfect absorption peaks are formed at 7103 nm and 7499 nm, respectively, which also can be separately shifted in a wide wavelength region by varying some key structural parameters. Moreover, our proposed structure manifests polarization sensitivity and can maintain good optical absorption performance for wide angles of incidence.
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