In this paper, a broadband metamaterial absorber (MA) operated in the visible light band with ultra wide-angle and polarization-insensitive characteristics which consists of a four-layer periodic structure is presented and analyzed, materials of the structure are tungsten, silicon dioxide, silicon nitride and silicon, respectively. According to numerical calculation analysis from finite-difference time-domain method, an absorptivity more than 96% and an average absorptivity of 99.1% are exhibited on this proposed MA. Furthermore, the MA shows not only preferably polarization-independent property through adjusting polarization angle from 0° to 90°, but also better wide-angle characteristics for both TE and TM modes. The MA's physical absorption mechanism which is generated by the coupling of dipole resonance and surface plasmon polaritons is analyzed by the electric and magnetic field distributions on the section plane. The influence for absorption from structure parameters is also investigated and construed. Finally, the equivalent circuit is drawn at the end of this article. The presented absorber has the potential to be applied in solar energy collection, light-to-heat conversion and other applications.

本文提出并分析了一种工作在可见光波段的超广角超材料吸收体（MA），该吸收体由四层周期结构组成，结构材料为钨、二氧化硅。 、氮化硅和硅。根据时域有限差分法的数值计算分析，该MA的吸收率超过96%，平均吸收率达到99.1%。此外，通过将偏振角从 0° 调整到 90°，MA 不仅表现出较好的偏振无关特性，而且对 TE 和 TM 模式都有更好的广角特性。马' 通过截面上的电场和磁场分布分析偶极共振和表面等离子体激元耦合产生的物理吸收机制。还研究和解释了结构参数对吸收的影响。最后，在本文末尾绘制了等效电路。所提出的吸收器具有应用于太阳能收集、光热转换和其他应用的潜力。