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(a) Schematic view showing the working principle of the plasmonic metasurface composed of hydrogen-responsive magnesium metasurfaces interacting with incident unpolarized white light; (b) color palette obtained by stepwise tuning of s and d; (c) color evolutions of the selected color squares upon hydrogen exposure over time ln(t). The grey-dashed lines indicate the color vanishing times in the two cases. All figures are adapted from reference [109].
