Near-field optical response of a two-dimensional grating of gold nanoparticles

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Abstract
This article reports on the near-field optical response of a small square grating of gold nanoparticles tailored by electron-beam lithography. The investigation of the grating is aimed at a deepened understanding of electromagnetic interaction among particles due to scattered light fields. Therefore, a photon scanning tunneling microscope is applied to acquire near-field optical images. Two different incident wavelengths are used to characterize the intensity and the spatial localization of the electromagnetic near field both in and out of resonance for the excitation of particle plasmons. Furthermore, the near-field enhancement resulting from the plasmon excitation is evaluated.