Near-Field Optical Microscopy of Localized Surface Plasmons Excited in Noble Metal Nanostructures

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  • IMURA Kohei
    Waseda University Japan Science and Technology Agency
  • OKAMOTO Hiromi
    Institute for Molecular Science The Graduate University for Advanced Studies

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  • 金属ナノ構造における局在プラズモンモードの動的近接場イメージング
  • キンゾク ナノ コウゾウ ニ オケル キョクザイプラズモンモード ノ ドウテキ キンセツジョウ イメージング

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Abstract

Scanning near-field optical microscope is able to achieve a nanometer spatial resolution, and is useful for visualization of elementary excitations in nanomaterials. Combination of the near-field optical microscope with the time-resolved spectroscopy enables us to visualize spatio-temporal behaviors of the excited states. We apply this imaging technique to the studies of static and dynamic optical properties of single gold nanorods. The static near-field image of a single gold nanorod shows a periodic oscillation along the long axis of the nanorod, and is attributed to a plasmon mode resonantly excited. The dynamic near-field image of the nanorod shows a characteristic spatial feature, which is very different from that of the static image. We discuss the origin of the dynamic near-field image, and the image is assigned to variations of plasmon modes induced by the photo-excitation. We also discuss the future prospect of the dynamic near-field microscopy and its applications to fundamental studies on plasmonic materials.

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