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Apertureless near-field scanning optical microscopy is used at 415.4 nm to investigate the normal component of the field scattered by silver and gold nanoparticles. Resonant excitation of the plasmon for silver produces a confined field distribution in the vicinity of the particle. For gold, driven off-resonance, the near-field response shows a pronounced contribution from propagating components to the scattered field. The differing near-field features are analyzed by considering the polarizability of the particles, the spatial evolution of the field as a function of distance from the sample, and the interactions with the near-field probe.
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Wurtz et al. (2003) studied this question.
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