  Thermal infrared (IR) radiation has attracted considerable attention due to
its applications ranging from radiative cooling to thermal management. In this
paper, we design a multi-band graphene-based metamaterial absorber compatible
with infrared applications and radiative cooling performance. The proposed
structure consists of the single-sized metal-insulator-metal (MIM) grating
deposited on metal/insulator substrate and single-layer graphene. The system
realizes a broadband perfect absorption ranging from 940 nm to 1498 nm and a
narrowband perfect absorption at the resonance wavelength of 5800 nm.
Meanwhile, the absorptivity of the structure is suppressed within the mid-wave
infrared (MWIR) and long-wave infrared (LWIR) ranges. Furthermore, to
demonstrate the tunability of the structure, an external voltage gate is
applied to the single-layer graphene. It is shown that, by varying the chemical
potential of graphene layer from 0 eV to 1 eV , the absorption resonances at
the mid-infrared (MIR) range can shift toward the shorter wavelengths. It is
also observed that the structure can possess an average net cooling power over
18 at the ambient temperature, when is varied from 0 eV to 1 eV. Finally, we
investigate the overall performances of the structure as a function of
temperature to realize thermal infrared applications.
