• 文献标题:   Perfect Absorption of Fan-Shaped Graphene Absorbers with Good Adjustability in the Mid-Infrared
  • 文献类型:   Article
  • 作  者:   REN HY, SHANGGUAN QY, SONG ZJ, ZHAO Y, YI Z, MA GL, ZHANG JG, YANG H, WANG SF, WU PH
  • 作者关键词:   graphene metamaterial, surface plasmon resonance, midinfrared, tunable, finitedifferent timedomain
  • 出版物名称:   COATINGS
  • ISSN:  
  • 通讯作者地址:  
  • 被引频次:   1
  • DOI:   10.3390/coatings12070990
  • 出版年:   2022

▎ 摘  要

This paper presents a graphene metamaterial absorber based on impedance matching. A finite difference in time domain (FDTD) method is used to achieve a theoretically perfect absorption in the mid-infrared band. A basis is created for the multiband stable high absorption of graphene in the mid-infrared. The designed graphene absorber is composed of graphene, a dielectric layer, a gold plane, and a silicon substrate, separately. The incident source of mid-infrared can be utilized to stimulate multiband resonance absorption peaks from 2.55 to 4.15 mu m. The simulation results show that the absorber has three perfect resonance peaks exceeding 99% at lambda(1) = 2.67 mu m, lambda(2) = 2.87 mu m, and lambda(3) = 3.68 mu m, which achieve an absorption efficiency of 99.67%, 99.61%, and 99.40%, respectively. Furthermore, the absorber maintains an excellent performance with a wide incident angle range of 0 degrees-45 degrees, and it also keeps the insensitive characteristic to transverse electric wave (TE) and transverse magnetic wave (TM). The results above indicate that our perfect graphene absorber, with its tunability and wide adaptability, has many potential applications in the fields of biosensing, photodetection, and photocell.