A stepped graphene metamaterial terahertz absorber is proposed to achieve wideband absorption characteristics. By etching the rectangular groove on the surface of graphene and dynamically adjusting the length and the width of the rectangular groove, we improved the absorptivity up to 0.9475 and obtained a broadband absorption band of 5.885 THz. In addition, the absorber has the characteristics of electrical tunability, polarization independence, and large angle absorption, which improve the utilization of light waves. The graphene metamaterial absorbers proposed in this paper have potential applications in the fields of stealth and photoelectric conversion.

中文翻译：

---

基于石墨烯超材料的太赫兹阶梯式宽带吸收器

提出了一种阶梯形石墨烯超材料太赫兹吸收器，以实现宽带吸收特性。通过蚀刻石墨烯表面上的矩形凹槽并动态调整矩形凹槽的长度和宽度，我们将吸收率提高到0.9475，并获得了5.885 THz的宽带吸收带。另外，该吸收器具有电可调性，偏振独立性和大角度吸收的特性，从而提高了光波的利用率。本文提出的石墨烯超材料吸收剂在隐身和光电转换领域具有潜在的应用。