KEYWORDS: Absorption, Metals, Iron, 3D modeling, Polarization, Dielectrics, Finite-difference time-domain method, Data modeling, Aluminum, Solar energy
An ultra-broadband, nearly polarization-independent absorber is studied numerically, in which an Fe square- patch is periodically placed on Fe-SiO2 multilayer stacks. Special emphasis is placed on the determination of the patch width, since its optimum width significantly differs from that previously found in a 2D structure. A somewhat wider width leads to a broader bandwidth than that for the 2D structure. Further calculations reveal that the proposed structure operates even for oblique incidence, although the absorption gradually decreases as the angle of incidence is increased. Comparison with a different metal-insulator structure also shows that a comparable performance is obtained for Ti-Al2O3.
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