A polarization-sensitive broadband plasmonic absorber consists of multiple black phosphorus (BP)/dielectric layers stacking on an Ag reflector has been proposed theoretically and demonstrated numerically for infrared (IR) regime. The optimum geometrical parameters have been achieved by parametric sweep analyses with regard to the fabrication considerations and miniaturization of the absorber structure. So a high absorption (above 85%) with relatively broad bandwidth of 5.24 µm corresponding to the relative bandwidth of 42.12% has been achieved for the designed periodic structure with optimum unit cell dimensions of ${0.5}\;\unicode{x00B5}{\rm m} \times {1.755}\;\unicode{x00B5}{\rm m}$. The electromagnetic loss in the BP material is the foundation of absorption performance in the designed absorber. The proposed anisotropic broadband IR absorber may have great potential in many areas of photonics.

中文翻译：

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基于多层黑磷纳米带的宽带红外吸收剂的设计

偏振敏感宽带等离子体吸收器由堆叠在 Ag 反射器上的多个黑磷 (BP)/介电层组成，已在理论上提出，并在红外 (IR) 范围内进行了数值论证。关于吸收器结构的制造考虑和小型化，已经通过参数化扫描分析获得了最佳几何参数。因此，对于设计的周期结构，其最佳晶胞尺寸为${0.5}\;\unicode{x00B5}{x00B5}{ \rm m} \times {1.755}\;\unicode{x00B5}{\rm m}$. BP 材料中的电磁损耗是设计的吸波器吸收性能的基础。所提出的各向异性宽带红外吸收器在光子学的许多领域可能具有巨大的潜力。