Figure 4.

Chromaticity spectra for different combinations of pitch and width/radius (structure height fixed at 100 nm) for a variety of LT structures: (a) checkerboards, (b) crossed gratings and (c) circular nanopillars in square symmetry. The volume in unit cell increases from pillars, to crossed gratings and to checkerboards. The chromaticity of the cells in planar configuration with a top layer with the equivalent refractive index of the photonic layer (obtained by the Bruggerman approximation) is illustrated below.