Plasmon modes in single gold nanodiscs

Kohei Imura, Kosei Ueno, Hiroaki Misawa, Hiromi Okamoto, Duncan McArthur, Benjamin Hourahine, Francesco Papoff

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Optical properties of single gold nanodiscs were studied by scanning near-field optical microscopy. Near-field transmission spectra of a single nanodisc exhibited multiple plasmon resonances in the visible to near-infrared region. Near-field transmission images observed at these resonance wavelengths show wavy spatial features depending on the wavelength of observation. To clarify physical pictures of the images, theoretical simulations based on spatial correlation between electromagnetic fundamental modes inside and outside of the disc were performed. Simulated images reproduced the observed spatial structures excited in the disc. Mode-analysis of the simulated images indicates that the spatial features observed in the transmission images originate mainly from a few fundamental plasmon modes of the disc.
Original languageEnglish
Pages (from-to)12189-12199
Number of pages11
JournalOptics Express
Issue number10
Early online date13 May 2014
Publication statusPublished - 2014


  • optical properties
  • single gold nanodiscs
  • plasmon modes
  • near-field optical microscopy


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