Fig. 1. Structural schematic of grating-type absorber

Fig. 2. Relationship between dielectric constant of h-BN and wavelength. (a) Relationship between real part of dielectric constant of h-BN and wavelength; (b) relationship between imaginary part of dielectric constant of h-BN and wavelength

Fig. 3. Contour map of absorption versus incident angle and wavelength under optimized structural parameters

Fig. 4. Magnetic field distributions of unit structure at different incident wavelengths under normal incidence of TM. (a) 6.5 μm; (b) 10.5 μm; (c) 12.5 μm; (d) 13.8 μm

Fig. 5. Relative changes of absorption curves when geometrical parameters of the structure are changed and other parameters remain unchanged. (a) L; (b) P; (c) T₁; (d) T₂; (e) W₁; (f) W₂