【摘要】 近年来，利用石墨烯实现电磁波吸收器动态调控的研究引起了人们的广泛关注。利用悬链线设计了图案化石墨烯吸收器，计算结果显示，在TE波模式下，该吸收器在太赫兹频段可在5.57 THz和7.11 THz两个频点处实现双频完美吸收。对石墨烯层表面电场强度和电流分布的分析表明，该双频完美吸收与石墨烯层的局域表面等离激元激发所引起的电偶极子共振有关。在此基础上，对共振吸收频率与吸收器结构的几何参数，外加偏置电压和入射角度的关系的仿真显示该吸收器可有效的实现对吸收的动态调控，同时该结构对于大的入射角范围(0°～40°)也能实现90%以上的吸收率。更多还原

【Abstract】 In recent years, research on the dynamic regulation of electromagnetic wave absorbers using graphene has attracted extensive attention. In this paper, a patterned graphene absorber is designed with a catenary, and the calculated results show that the absorber achieves perfect dual-frequency absorption at 5.57 THz and 7.11 THz in the terahertz frequency band in the TE wave mode. The analysis of the electric field strength and current distribution on the surface of the graphene layer shows that the perfect absorption of the dual frequency is related to the electric dipole resonance caused by the local surface plasmon excitation of the graphene layer. On this basis,the simulation of the relationship between the resonant absorption frequency and the geometric parameters of the absorber structure, the coupled bias voltage and the incident angle shows that the absorber can effectively realize the dynamic control of the absorption, and the structure can also reflect the absorption rate of more than 90% for a large range of incidence angle(0° to 40°).更多还原