Ting Zhang, Taiming Guo, Junya Yan, Yanan Pei. Design of Tunable Four-Broadband Terahertz Absorber[J]. Acta Optica Sinica, 2024, 44(5): 0523002
- Acta Optica Sinica
- Vol. 44, Issue 5, 0523002 (2024)
Fig. 1. Diagram of broadband absorb structure. (a) Schematic of complete array; (b) top view of unit
Fig. 2. Absorption and real part and imaginary part of the permittivity with different conductivities of VO2. (a) Absorption with different conductivities of VO2; (b) real part of permittivity with different conductivities of VO2; (c) imaginary part of permittivity with different conductivities of VO2
Fig. 3. Absorption curves of without VO2, VO2 is cross, VO2 is four-arm, and entire absorber structure
Fig. 4. Absorption spectra under different thicknesses and tangent losses of SiO2. (a) Absorption spectra under different thicknesses of SiO2; (b) absorption spectra under different tangent losses of SiO2
Fig. 5. Relative impedance at different VO2 conductivities. (a) Real part of relative impedance; (b) imaginary part of relative impedance
Fig. 6. Surface electric field distribution at four absorption peaks. (a) f1=1.44 THz; (b) f2=3.89 THz; (c) f3=6.63 THz; (d) f4=9.03 THz
Fig. 7. Effect of incidence and polarization angles on absorption. (a) Effect of incidence angle in TE mode; (b) effect of incidence angle in TM mode; (c) effect of polarization angle in TE mode
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