Fig. 1 Schematic of ultra-broadband achromatic metasurfaces designed by bottom-up topology optimization (IMAGE)

Science China Press

Fig. 1 Schematic of ultra-broadband achromatic metasurfaces designed by bottom-up topology optimization

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a, Inverse-designed achromatic metssurfaces; b, Three typical beams; c, Non-dispersive, non-dispersive combined with dispersive features; d, Targeted phases and transmission efficiencies; e, Sketch of a heuristic bottom-up strategy.

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