Wide-angle infrared plasmonic perfect absorber based on graphene-silica grating

In this paper, wide-angle infrared perfect absorption has been demonstrated by using a double-layer graphene strip grating coupled with silicon dioxide grating. Numerical simulation of the finite-difference time-domain method indicates that can be achieved due to effective impedance matching, and all incident electromagnetic energy is confined in Al 2 O 3 layer between silver substrate Dual-band change width or chemical potential bi-layer It found spectral position peak tuned strip, additionally size proposed absorber. Moreover, absorber shows excellent stability for wide range angle up ±65°. The may find application tunable double band absorbers mid-infrared range.