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Fig. 15

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Spectral tolerance of the best candidates in terms of protection (C1, left panel) and invisibility (C2, right panel). The wavelength in abscissa is normalized by λ0, the freespace wavelength targeted for the optimization process. The blue curves correspond to the CTGWO method, the orange ones to T-NSGA-II, the green ones to T-NSGA-II+, the red ones to C-NSGA-II and the purple ones to C-NSGA-II+. The five grey (resp. black) curves in each plot represent the spectral behavior of C1 and C2 for random cloaks obtained by filling each voxel of the design space by an arbitrary integer (resp. real) value in {7, 10, 12} (resp. [7:12]).

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