ABSTRACT We propose a method to realize ultra-broadband perfect absorption by using multiple slabs of asymmetric hyperbolic metamaterial (AHM) made of doped silicon nanowire arrays. Our numerical results show that the absorptance of the structure is greater than 0.99 in the wavelength range from to for an incident transverse magnetic (TM) plane wave at an angle of incidence equal to . Moreover, the broadband absorptance can still be above 0.9 when the angle of incidence is in the range from to . The underlying mechanism is elucidated as due to the combination of matching of impedance at the interfaces and enhanced absorption in the AHM slabs of the structure. This work may provide in the design of metamaterial absorbers with some inspiring guidelines for obtaining highly enhanced absorption over an ultra-broadband and in a wide range of angle of incidence.

中文翻译：

---

堆叠非对称双曲超材料板的超宽带完美吸收

摘要 我们提出了一种通过使用由掺杂硅纳米线阵列制成的多片非对称双曲超材料 (AHM) 来实现超宽带完美吸收的方法。我们的数值结果表明，对于入射角等于 的入射横向磁 (TM) 平面波，该结构的吸收率在从 到 的波长范围内大于 0.99。此外，当入射角在 到 的范围内时，宽带吸收率仍然可以在 0.9 以上。由于界面处的阻抗匹配和结构的 AHM 板中增强的吸收相结合，因此阐明了潜在机制。