In this paper, tunable and efficient absorbers are proposed based on graphene–metal nano structures. The designed structures are consisted of multi layers of graphene (ring- and plate-shaped) and gold (5*5 cells) on the background of silica. By introducing different ring-shaped graphene layers (one, two or three), the near unity absorption coefficient can be achieved. The effects of different parameters like the distance, radius and chemical potential (h₁, R_in1, E_fR1, h₂, R_in2, E_fR2, h₃, R_in3, E_fR3) on the absorption spectrum (wavelength and value) are also considered. The best resonant peak (near unity) is obtained for the structure with three ring-shaped graphene layers. The final proposed structure (with three rings) can be utilized as an effective sensor for detecting materials with different refractive indices (from 1. to 1.5) with sensitivity of 100 (nm/RIU). The designed structure can be applied as a strong absorber or sensitive sensor in nano-optical systems.

在本文中，基于石墨烯-金属纳米结构提出了可调且高效的吸收器。设计的结构由二氧化硅背景上的多层石墨烯（环状和板状）和金（5 * 5单元）组成。通过引入不同的环形石墨烯层（一层、两层或三层），可以实现接近统一的吸收系数。像的距离，半径和化学势（不同参数的影响ħ ₁，R _IN1，E _{f R1时}，H ₂，R _IN2，E _FR2，H ₃，R_立方英寸，E _FR3) 的吸收光谱（波长和值）也被考虑在内。对于具有三个环形石墨烯层的结构，获得了最佳共振峰（接近统一）。最终提出的结构（具有三个环）可用作检测具有不同折射率（从 1. 到 1.5）的材料的有效传感器，灵敏度为 100 (nm/RIU)。所设计的结构可用作纳米光学系统中的强吸收体或敏感传感器。