Here, we present a broadband absorber with a periodic nested-cylinder and ring-shaped array structure, comprising a Ti base, an \(A{l_2}{O_3}\) intermediate layer, and a top Ti ring column composite. A borophene layer is strategically inserted between the dielectric and top layers, resulting in a 4.33% enhancement in absorption. The device achieves over 90% absorption across 280–3000 nm, validated through electromagnetic field analysis and impedance matching theory. We systematically investigate the impacts of polarization, incidence angle, and geometric parameters on absorption performance. Under AM 1.5 solar illumination, the absorber demonstrates high efficiency for solar energy harvesting. At 1500 K, its thermal emissivity peak is about 96.75%, positioning it as a versatile platform for solar photovoltaics and thermal radiation applications.
