Fig. 1. Structure diagram of the absorber unit with silicon dioxide as the dielectric layer. (a) Stereogram of the structure of a graphene absorber with gold as the base and silicon dioxide as the dielectric layer; (b) Top view of the graphene absorber structure

Fig. 2. Reflectivity, absorption, and transmittance of the graphene absorber structure in the 4 THz to 8 THz

Fig. 3. The comparison of the absorption rate when the patterned graphene layer is in the shape of a catenary, semicircle, and rectangle

Fig. 4. Surface electric field intensity distribution corresponding to two absorption peaks of different frequencies of graphene absorber. (a) Surface electric field intensity distribution of 5.57 THz; (b) Surface electric field intensity distribution of 7.11 THz

Fig. 5. Surface current distribution map of the graphene absorber at the absorption peak. (a) Surface current distribution of electromagnetic waves at 5.57 THz on the graphene absorber; (b) Surface current distribution of electromagnetic waves at 7.11 THz on the graphene absorber

Fig. 6. Effect of structural parameters on absorption. (a) Curve of absorption rate at different periods; (b) Curves of absorption rate at different dielectric layer thicknesses of silica; (c) Curves of absorption rate at different catenary widths; (d) Curves of absorption rate under different catenary coefficients

Fig. 7. Influence of relaxation time and Fermi level on the absorption performance of graphene absorbers. (a) Effect of relaxation time on absorption rate; (b) Effect of Fermi energy on absorption rate

Fig. 8. When the incident angle θ of the electromagnetic wave varies from 0° to 60°, the absorption spectrum diagram of the graphene absorber

Fig. 9. Analysis of the azimuthal polarization sensitivity of graphene absorber. (a) Compares the absorption peaks under TE and TM wave modes; (b) The absorption spectrum of the graphene absorber as the azimuth angle varies from 0° to 90°