In this paper, a graphene-based metamaterial absorber is proposed and investigated numerically, in which the interaction between a split ring resonator (SRR) and graphene results in a high-Q absorption. To make a better understanding of the resonance mechanism, the electric and the magnetic fields, and the surface currents at the resonance frequency are investigated. In order to ease the analysis of the structure, an equivalent circuit model is introduced using the transmission line theory, and the accuracy of the proposed model is verified by the full-wave simulation. Finally, different aspects of the designed metamaterial are discussed as a potential label-free sensor for chemical and biomedical sensing. It is shown that by using this structure, a sensor with a sensitivity of 597 GHz/RIU can be achieved.

在本文中，提出并数值研究了一种基于石墨烯的超材料吸收器，其中裂环谐振器 (SRR) 和石墨烯之间的相互作用导致高 Q 吸收。为了更好地理解谐振机制，研究了谐振频率下的电场和磁场以及表面电流。为了便于结构分析，利用传输线理论引入等效电路模型，并通过全波仿真验证了模型的准确性。最后，讨论了所设计的超材料的不同方面，作为用于化学和生物医学传感的潜在无标记传感器。结果表明，通过使用这种结构，可以实现灵敏度为 597 GHz/ RIU的传感器。