Fig. 1. Structure of the absorber. (a) Three-dimensional view; (b) side view

Fig. 2. Absorption performance of absorber. (a) Absorption, reflection and transmission of the absorber; (b) influence of different polarization angles on the absorption spectrum

Fig. 3. Electric and magnetic field distribution in the x-z plane. (a) Electric field distribution when λ=9.72 μm; (b) electric field distribution when λ=12.04 μm; (c) magnetic field distribution when λ=9.72 μm; (d) magnetic field distribution when λ=12.04 μm

Fig. 4. Structure of the embedded absorber. (a) Three-dimensional view; (b) side view

Fig. 5. Absorption performance of embedded absorber. (a) Absorption, reflection and transmission of the absorbers; (b) influence of different polarization angles on the absorption spectrum

Fig. 6. Distribution of electric and magnetic fields in the x-z plane. (a)--(d) Eectric field distribution when λ is 7.69 μm, 9.10 μm, 10.96 μm, 13.13 μm; (e)--(h) magnetic field distribution when λ is 7.69 μm, 9.10 μm, 10.96 μm, 13.13 μm

Fig. 7. Absorption curves under different physical parameters. (a) d₂₁; (b) d₂₃; (c) d₂₃; (d) w₂₂; (e) w₂₃; (f) P₂

Fig. 8. Absorption curve of the absorber. (a) Different metal materials; (b) different dielectric materials

Fig. 9. Absorption spectra corresponding to different incident angles. (a) TM mode; (b) TE mode