超材料吸收剂
材料科学
太赫兹辐射
超材料
吸收率
石墨烯
光电子学
光学
宽带
等离子体子
极化(电化学)
可调谐超材料
纳米技术
物理
反射率
物理化学
化学
作者
Xiaojun Huang,Mengyu Cao,Danqi Wang,Xuewen Li,Jingdao Fan,Xiaoyan Li
摘要
Metamaterial absorbers have been widely studied in the past decade and their performances have been incessantly improved in the practical applications. In this paper, we present a broadband terahertz metamaterial absorber based on graphene-polyimide composite structure, and the structure consists of a metal substrate and graphene layers with different sizes separated by two polyimide dielectric layers. The simulation results show that the absorptance of the absorber is greater than 90% in 0.86–3.54 THz with the fractional bandwidth of 121.8%. The absorptance can be adjusted by changing the chemical potential of graphene. In addition, the absorber is insensitive to polarization and still has robust tolerance for the oblique incidence. The equivalent circuit model based on transmission line is introduced to analyze the physics of the designed absorber and the results are in good agreement with the simulations. We believe that the designed absorber is a potential competitive candidate in terahertz energy harvesting and thermal emission.
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