Ultra-broadband Near-Unity Light Absorption by Disjunct Scattering Resonances of Disordered Nanounits Created with Atomic Scale Shadowing Effect

摘要: Metamaterial perfect absorbers have been the subject of many studies in recent years. Near-unity light harvesting an ultra-broadband frequency range is prime goal applications such as photoconversion systems. While most common designs for achieving this are periodic plasmonic architectures, work reveals unprecedented potential random absorption. A metal-insulator-metal (MIM) structure with a periodically patterned top layer has discrete translational symmetry. The proposed theory, supported by numerical simulations, unveils fact that breaking symmetry introduces multiple resonant units separate spectra, and superposition these resonances broaden overall response. absorber realized using oblique angle deposition-induced atomic scale shadowing effect. Based on experimental results calculations, disorder design can propose unity absorption (> 90%) over spectral from 520 to 1270 nm.