Fig. 1. (a) Schematic of the linear array absorber. (b) Schematic of the cross array absorber.

Fig. 2. Absorption spectra of designed structures.

Fig. 3. (a) Temperature field distribution in the cross array absorber for Δh=0.1μm. (b) Absorption spectra of the cross array absorber for different Δh.

Fig. 4. Absorption spectra of the cross array absorber for different offset distances.

Fig. 5. Absorption spectra of the cross array absorber at different polarization angles: (a) at a normal incidence; (b) at an incident angle of 27°.

Fig. 6. Absorption spectra of the cross array absorber at different incident angles: (a) under TM polarization; (b) under TE polarization.

Fig. 7. Three-dimensional (3D) FDTD simulation of the electromagnetic field distribution. (a) The electric field distribution in the x–y plane. (b) The magnetic field distribution in the x–y plane. (c) The electric field distribution in the x–z plane. (d) The magnetic field distribution in the x–z plane.