Beilstein J. Nanotechnol.2017,8, 956–967, doi:10.3762/bjnano.8.97
scanning near-field optical microscopy.
Keywords: aperture scanning near-field optical microscopy; gold rippled surface; localized hot spots; metal–dielectric−metalnanogaps; surface plasmon resonance; Introduction
Metal nanostructures capable of producing localized surface plasmon polaritons (SPPs) are
, surface plasmons are coupled into the gap to excite a localized QNM [57]. In addition, open nanogaps offer also a unique environment to study SPP propagation. SPP propagation is a conceptually different phenomenon from the localized plasmon resonance [58]. However, if the metal–dielectric–metalnanogaps
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Figure 1:
Schematic of the scattering geometry with the electromagnetic field vectors for linear p- and s- po...