We report on near-field measurements and calculations of the optical intensity close to rod-shaped gold nanoparticles excited at a multipolar plasmon resonance. Our results reveal a distinct optical near-field pattern and show that multipolar plasmon excitation of single nanoparticles can be imaged in the near-field. The observed optical near-field patterns can be understood in a model of standing plasmon waves.
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Hohenau et al. (2005) studied this question.
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