Limin Ma, Han Xu, Yuhuang Liu, Guili Xu, Wanlin Guo. Broadband Terahertz Absorber Based on Graphene Metamaterial[J]. Acta Optica Sinica, 2022, 42(9): 0923001
- Acta Optica Sinica
- Vol. 42, Issue 9, 0923001 (2022)
Fig. 1. Relationship among surface impedance, chemical potential, and frequency of graphene
Fig. 2. Terahertz absorber based on monolayer graphene metamaterial. (a) Three-dimensional structure diagram; (b) top view of unit
Fig. 3. Absorption spectra of metamaterial absorber under different structural parameters. (a) Outer radius r2 of graphene ring is between 1.0 μm and 1.8 μm; (b) inner radius r1 of graphene ring is between 0.05 μm and 0.45 μm; (c) dielectric thickness t is between 7.6 μm and 9.2 μm
Fig. 4. Electric field intensity distribution of terahertz absorber at 4.48 THz frequency
Fig. 5. Variation curves of absorptivity with frequency under different values of graphene chemical potential μc
Fig. 6. Absorptivity of metamaterial absorbers at different polarization angles
Fig. 7. Absorption spectra of terahertz waves in different modes. (a) TE mode; (b) TM mode
Fig. 8. Structure diagram of absorber based on two-layer graphene metamaterial. (a) Three-dimensional view; (b) unit top view of upper graphene metamaterial; (c) unit top view of lower graphene metamaterial; (d) side view
Fig. 9. Absorptivity curves of terahertz absorber based on two-layer graphene metamaterial
Fig. 10. Electric field intensity distribution of absorber based on bilayer graphene metamaterial. (a) Electric field distribution of G1 layer at 4.75 THz frequency; (b) electric field distribution of G2 layer at 3.05 THz frequency
Fig. 11. Structure diagram of absorber based on three-layer graphene metamaterial. (a) Three-dimensional view; (b) unit top view of upper graphene metamaterial; (c) unit top view of interlayer and lower graphene metamaterial; (d) side view
Fig. 12. Absorptivity curve of terahertz absorber based on three-layer graphene metamaterial
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