Fig. 2: Transmission spectra depicting effects of different physical paramaters of NP meta-grid.

Transmittance spectra, calculated from the theoretical model, depicting the effects of different physical parameters of the hexagonal array of silver nanospheres, such as the radius R, interparticle gap g, and “height” h from the interface between typical semiconductor (n₁=3.5) and encapsulating (n₂=1.6) materials: a variation with g for fixed radius (R=20nm) and height (h=2nm), b variation with h for fixed radius (R=20nm) and gap (g=40nm), and c variation with R for fixed gap (g=40nm) and height (h=2nm). d–f Zoomed-in view of the theory-based (“analytical”) spectra, in the domains highlighted by the red boxes in (a–c) compared with data (colored dotted curves) obtained from full-wave simulations. For all cases, only normally incident light is considered. The dotted horizontal lines indicate transmittance without the nanoparticle layer