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Calculated normal-incidence optical extinction (one minus the calculated intensity transmission) spectra for x-polarized light (left axis, continuous lines), as well as the calculated SHG intensity (right axis, connected data points) for an array of bare gold nanoantennas (dark yellow) and an array of nanoantennas with dielectric nanoparticles (blue). The SHG intensity spectra are normalized to the maxima of the corresponding bare gold nanoantenna arrays.
