▎ 摘　　要

Based on the critical coupling and guided resonance mechanism, a novel coupling structure of circular cross metal and single-layer graphene was proposed to achieve high-efficiency and perfect absorption in the near infrared. The results show that the absorber structure achieves the absorption efficiency of 99.98 % at 2121.39 nm. The working wavelength can be flexibly adjusted by adjusting the structural parameters of the circular cross metals and the structural period of the absorber, which is of great practical significance for improving the absorption efficiency and selectivity of the single-layer graphene. In addition, the sensing characteristics of the absorber are studied by its sensitivity to the change of the refractive index (RI). Finally, the angle sensitivity of the structure is studied by changing the polarization and the incident angle of the light source. The results show that the high performance perfect absorber designed in this paper can be used in practical optoelectronic devices, such as detectors and sensors.