Numerical study of an ultra-broadband, wide-angle, polarization-insensitive absorber in visible and infrared region

An ultra broadband high-performance metamaterials absorber is designed based on the Fabry-Perot resonance effect and hybrid coupling theory. In this paper, we use the numerical method to analyze the absorption characteristics of the absorber under the conditions of wide band, different polarization states and large angle oblique incidence. The results reveal that the absorption band of the absorber is 300 nm–3000 nm, and its average absorption rate exceeds 93%. In addition, the absorptivity of the absorber is less affected by the polarization angle and incident angle of the incident light. The physical mechanism of wide-band high-absorption is analyzed, which is mainly caused by Fabry-Perot resonance, surface plasmon resonance, local surface plasmon resonance and the hybrid coupling among them. The proposed metamaterial absorber is expected to play a role in invisible devices, solar cells and other fields owing to its wide absorption bandwidth, high absorption, independent to polarization and stable at wide-angle of incidence.