Four peak and high angle tilted insensitive surface plasmon resonance graphene absorber based on circular etching square window

Abstract This article introduces a new type of graphene-based perfect absorber that features tunability across four wave peaks and high sensitivity, consisting of Ag–SiO 2 –graphene. By controlling the Fermi level and relaxation time of graphene, the tunability of the absorber is achieved, and by changing the refractive index of SiO 2 , the selectivity of the resonant wavelength is realized. The results show that the absorber has an average absorption rate of 98.54% at four wavelengths: 2092.24 nm, 2180.67 nm, 2230.08 nm, and 2336.17 nm. The electric field distribution intensity is simulated to verify whether it meets the impedance matching theory, exploring the physical mechanism behind the high absorption…

• NN
  National Natural Science Foundation of China

  Awards: 11604311, 61805278
• SU
  Southwest University of Science and Technology

  Awards: JZ21-052, JZ21-057