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(A) Schematic sketch of a SNOM in collection mode; (B) detail of the SNOM probe; (C) Schematic sketch representing the physical description of dark-spot correspondent to AuNSs. The aperture SNOM is operating in collection mode, the laser light wavelength is 780 nm in order to exploit the infrared transparency window. During the scanning, when the SNOM probe is positioned in correspondence of the AuNS, the optical signal is strongly reduced. (Reprinted from [41] with permission).
