Zhao Xue, Haiting Zhang, Maosheng Yang, Xiaoxian Song, Jingjing Zhang, Yunxia Ye, Yunpeng Ren, Xudong Ren, Jianquan Yao. Tunable Broad-Spectral Terahertz Absorber Based on Graphic Graphene[J]. Laser & Optoelectronics Progress, 2022, 59(5): 0530002
- Laser & Optoelectronics Progress
- Vol. 59, Issue 5, 0530002 (2022)
Fig. 1. Schematic of absorber structure. (a) Schematic of graphene broadband tunable absorber; (b) absorber profile; (c) structural drawing of absorber surface
Fig. 2. Absorption spectrum of graphene terahertz broadband absorber
Fig. 3. Absorption versus thickness of the dielectric layer
Fig. 4. Absorption curve of Fermi energy level of 0.1‒0.4 eV in graphene
Fig. 5. Absorption curve of Fermi energy level of 0.4‒1.6 eV in graphene
Fig. 6. Electric field distribution of broadband terahertz absorber at 1.53 THz. (a) Fermi energy level of graphene is 0.4 eV; (b) Fermi energy level of graphene is 1.6 eV
Fig. 7. Current distribution on upper and lower surfaces of terahertz tunable broadband absorber at 1.53 THz frequency point when the Fermi energy level of graphene is 0.4 eV. (a) Upper surface; (b) lower surface
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Table 1. Structural dimensions of graphene-based terahertz absorbers
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