Plasmon-Enhanced Spectroscopy: Fundamentals and Applications

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  • ITOH Tamitake
    Health Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
  • YAMAMOTO Yuko S.
    School of Materials Science, Japan Advanced Institute of Science and Technology (JAIST)

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  • プラズモン共鳴を用いた増強分光：基礎とその展開
  • プラズモン キョウメイ オ モチイタ ゾウキョウ ブンコウ : キソ ト ソノ テンカイ

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<p>Metallic gold and silver nanoparticles (NPs) with diameters of several tens of nanometers exhibit brilliant colors, reflecting their size and shapes. The origin of coloring is resonance between collective oscillation of metal conduction electrons and light, and is called plasmon resonance. Due to plasmon resonance, such NP surfaces are covered with strong localized light. Electromagnetic interaction between the localized light and molecules on the NPs greatly enhances optical molecular responses including absorption, scattering, etc. The spectroscopy utilizing the enhancement is called plasmon-enhanced spectroscopy. In this review, we explain the enhancement mechanism using surface-enhanced Raman scattering (SERS), which is one type of plasmon-enhanced spectroscopy. Then we report SERS observation of molecular structural changes under the single level. We also report the advantages of plasmonic nanowires instead of NPs for plasmon-enhanced spectroscopy. Finally, we introduce interesting phenomena that occur beyond the limit of the enhancement mechanism.</p>

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