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Abstract
We propose a thin, compact, broadband, polarization and angle insensitive metamaterial absorber based on a tungsten reflector, a silicon spacer, and a top pattern composed of a double square-like ring resonator utilizing nickel (Ni). In such a structure, a high absorption (above 80%) bandwidth ${\sim}{4.8}\;\unicode{x00B5}{\rm m}$ from 3.52 up to 8.32 µm corresponding to the relative bandwidth ${\sim}{81}\%$ can be achieved with deeply subwavelength unit cell dimensions. Here the physical origin of the broadband absorption is associated with low $ Q $-factor dipole modes of the top pattern inner and outer sides functioning as rectangular nanoantennas. Owing to the structural symmetry, the absorber shows a good incidence angle tolerance in the relatively wide range for both transverse electric and transverse magnetic polarizations. The effective parameters of the Ni-based absorber were retrieved using the constitutive effective medium theory, and the absorption characteristics of the effective medium and metamaterial were compared.
© 2020 Optical Society of America
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