Figure 6.

(a) Circular pillar enhancement simulation and (b) square pillar enhancement simulation. The blue and red peaks show the contribution of excitation and emission eigenmodes, respectively, and the gray area shows the contribution from nanoscale implantation intensity, I₀. A Lorentz curve (green) centered 600 nm with FWHM 200 nm is used as the ultimate fitting to show the enhancement envelop. Eigenmode patterns at maximum enhancement size are illustrated in (c–f). The left column is the 3D view of the eigenmodes, and the right column shows the view of eigenmode patterns from the pillar side, which clearly present the feature of standing waves. Circular pillar size of max excitation: 370 nm, size of max emission: 600 nm. Square pillar size of max excitation: 590 nm, size of max emission: 750 nm.