In this study, a novel ultra-broadband absorber is suggested and numerically analyzed to demonstrate that the suggested absorber can attain an average absorbance of 98.6% in the visible to near-infrared wavelength range(496–2100 nm). The structure of the proposed new ultra-wideband absorber consists of five thin films of silicon dioxide (SiO2), iron (Fe), magnesium fluoride (MgF2), chromium (Cr) and aluminium (Al). We have examined the structure’s electromagnetic field intensity distribution at numerous selected optical wavelengths and the influence of various structural parameters on the absorption performance of the absorber to offer a physical mechanism underlying the ultra-broadband absorption effect. Furthermore, in the presence of high-performance absorption, the structure has the effect of stabilizing absorption at large angles of incidence and is polarization independent at vertical angles of incidence. The study also assesses the solar absorption capability of this structure, indicating that the structure has potential applications in solar absorption, like solar energy collection and conversion, solar power generation, and thermal emitters.

In this study, a novel ultra-broadband absorber is suggested and numerically analyzed to demonstrate that the suggested absorber can attain an average absorbance of 98.6% in the visible to near-infrared wavelength range(496–2100 nm). The structure of the proposed new ultra-wideband absorber consists of five thin films of silicon dioxide (SiO2), iron (Fe), magnesium fluoride (MgF2), chromium (Cr) and aluminium (Al). We have examined the structure’s electromagnetic field intensity distribution at numerous selected optical wavelengths and the influence of various structural parameters on the absorption performance of the absorber to offer a physical mechanism underlying the ultra-broadband absorption effect. Furthermore, in the presence of high-performance absorption, the structure has the effect of stabilizing absorption at large angles of incidence and is polarization independent at vertical angles of incidence. The study also assesses the solar absorption capability of this structure, indicating that the structure has potential applications in solar absorption, like solar energy collection and conversion, solar power generation, and thermal emitters.