Journal of Jishou University(Natural Sciences Edition) ›› 2023, Vol. 44 ›› Issue (6): 37-43.DOI: 10.13438/j.cnki.jdzk.2023.06.007

• Functional Metamaterials • Previous Articles     Next Articles

Tunable Dual-Frequency Perfect Absorber with Graphene

ZHAO Jinyun,SHAN Xinyu,GAO Guangbo,HUANG Yonggang   

  1. (College of Physics and Electromechanical Engineering,Jishou University,Jishou 416000,Hunan China)
  • Online:2023-11-25 Published:2023-12-19

Abstract: A tunable dual-frequency perfect absorber consisting of a graphene resonator,a SiOdielectric layer and a metal reflector layer has been designed by utilizing the excellent tunable optical properties of graphene.The effects of graphene chemical potential,polarization angle and size on the absorber absorption performance were systematically investigated,and the electric field pattern at the resonance frequency was analyzed to further explain the principle of absorber absorption.The results show that the absorber has an absorption rate of 99.98% and 99.99% at 6.363 and 8.987,respectively.The absorption peak position of the absorber can be effectively adjusted by changing the chemical potential of graphene,and the peak absorption rate can reach more than the peak absorption rate at any polarization angle in the range of 0°~80°.The thickness of the SiO2 dielectric layer has almost no effect on the resonance peak position of this absorber,but it has some effect on the peak absorption rate,which increases and then decreases with the gradual increase of the thickness,and perfect absorption is achieved near the thickness of 3.1 μm.The high absorption rate of this absorber stems mainly from the electromagnetic resonance effect.

Key words: metamaterials, terahertz, graphene, dual-band absorber

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