Fig. 5: Whitening of diffuse light above critical packing.
From: Emergent scattering regimes in disordered metasurfaces near critical packing
a The BRDF and ping-pong ball images are obtained for a fixed metaatom size \({\ell}=95\,{{\rm{nm}}}\), by increasing the density or decreasing the spatial correlation for an incident angle of 30°. b CIE 1931 chromaticity diagram providing the colour coordinates (dark crosses) of the diffuse light in the direction perpendicular to the metasurfaces. The two blue dots indicate the white points for two standard illuminants, D65 and D50. In Supplementary Note 6, we present the same diffuse colours in the CIELAB 3D colour space, where brightness information (L*) is explicitly included. c Spectrum of \(1-{T}_{{{\rm{s}}}}-{R}_{{{\rm{s}}}}\) for the whitest metasurfaces of the set of 27 metasurfaces and for \({\theta }_{i}=10^\circ\). The brightest one shown with a red colour corresponds to \(p=0.1,\) \({\ell}=170\,{{\rm{nm}}}\) and \(\rho=10\,{{\mu}}{{{\rm{m}}}}^{-2}\) in Fig. 2c.
