Scatter Plot from Scientific Research

A log–log plot of N m against the resonance density ( ρ m ). Comparative works are marked with numbers: pixelated sensors [1] (ref. 36 ), radial BICs [2] (ref. 58 ), trapped rainbows [3] (ref. 39 ) and spectral-gradient metasurfaces [4] (ref. 40 ). Our work is highlighted with an asterisk (*), showcasing the spectral gradient and the coupling gradient at ρ m = 2.9 × 10 –2 and 2.7 × 10 –2 , respectively. The dual gradient is positioned at the top right, with ρ m = 1.

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