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Figure 2

From: Ultrawideband electromagnetic metamaterial absorber utilizing coherent absorptions and surface plasmon polaritons based on double layer carbon metapatterns

Figure 2

Schematics for designing optimal carbon metapatterns and simulation results of optimized metamaterial absorber. (a) Total structure and simulation setting. The side exterior boundaries of it are set to the periodic boundary condition. (b) Division of frequency domain into overlapping windows including three-points data. Combinations of pixel pairs for (c) top and (d) intermediate metapatterns. (e) Figure of merit vs number of iteration. (f) Simulated reflectances for normal incidence using 2D and 3D metapatterns. (g) Absorptions calculated at each part of the total structure and their total summation for normal incidence using 3D metapattern with \(d_p\) = 200 \(\upmu\)m. (h) Absorptions calculated for horizontal rotations of TE polarization. Absorptions calculated for oblique incidences of (i) TE and (j) TM polarizations.

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