In this paper, a broadband and polarization-insensitive metamaterial absorber (MA) operating in the visible light band based on a cascade structure is proposed, and the main structure of MA consists of three metal resonator layers (MRLs), a metal reflector at the bottom, and a dielectric substrate between them. Each MRL consists of four different resonators. The similar resonator is proportional to the size of the top view in the different MRLs. Through the different absorption effects generated by different MRLs, a MA working in the visible light band is obtained, which can cover 490–825 nm. Absorption bandwidth can be expanded by adding different MRLs and placing different resonators near the same layer. The center frequency of the absorption spectrum can be controlled by changing the layer distance between different MRLs. To better understand the physical mechanism of absorption, the electric and magnetic field intensity distributions, the power flows, and the power loss densities also are investigated. We also found that the better permanence can be obtained with the lower incident angle.

本文提出了一种基于级联结构的在可见光波段工作的宽带和偏振不敏感超材料吸收器（MA），其主要结构由三个金属谐振器层（MRL），金属反射器组成。底部，以及它们之间的介电基板。每个MRL包含四个不同的谐振器。在不同的MRL中，相似的谐振器与顶视图的大小成正比。通过不同MRL产生的不同吸收效应，可以获得在可见光波段工作的MA，它可以覆盖490–825 nm。可以通过添加不同的MRL并在同一层附近放置不同的谐振器来扩展吸收带宽。吸收光谱的中心频率可以通过改变不同MRL之间的层距来控制。为了更好地了解吸收的物理机制，还研究了电场和磁场强度分布，功率流和功率损耗密度。我们还发现，入射角越小，永久性越好。