Fig. 6: Specular reflectance when transitioning through critical coupling.
From: Emergent scattering regimes in disordered metasurfaces near critical packing
a Transitioning through critical packing by increasing the metaatom size of particulate metasurfaces and further reducing the disorder correlation of aggregate metasurfaces. The reflected colour transitions from forest green to a dark shade with a hint of grey; at critical packing, it exhibits a scarlet red (it is teal green in transmission). b (i) Specular reflectance spectra \({R}_{s}\) near normal incidence (\({\theta }_{i}=10^\circ\)) for the five metasurfaces shown in (a). (ii) \({R}_{{{\rm{s}}}}/{T}_{{{\rm{s}}}}\) ratio between the specular reflectance and transmission for the three metasurfaces operating around critical packing (the same colours as in (i) are used). (iii) Specular reflectance at critical packing for different incidences, \({\theta }_{i}=10^\circ,30^\circ\) and \({50}^{\circ }\). In (ii) and (iii), the dashed curves represent computational results for an equivalent 145 nm-thick Si film on glass. The nominal metaatom density for all metasurfaces is \(10\,{{\mu}}{{{\rm{m}}}}^{-2}\).
