Plasmon-Enhancement and Nano-Cavity Effects in STM Light Emission from Organic Films on Noble Metals

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  • NISHITANI Ryusuke
    Division of Quantum Physics, Department of Basic Sciences, Kyushu Institute of Technology
  • LIU Hongwen
    The Institute of Scientific and Industrial Research, Osaka University WPI-Advanced Institute for Materials Research, Tohoku University
  • IWASAKI Hiroshi
    The Institute of Scientific and Industrial Research, Osaka University

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Other Title
  • 貴金属表面上有機分子膜のＳＴＭ発光におけるプラズモン増強とナノキャビティ効果
  • キキンゾク ヒョウメン ジョウ ユウキ ブンシ マク ノ STM ハッコウ ニ オケル プラズモン ゾウキョウ ト ナノキャビティ コウカ

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Abstract

STM light emission (STML) has been shown to be a promising technique for nanometer scale analyses of electronic states of molecules on metals as the light emission due to the electronic transition between molecular levels is comparably intense with the plasmon induced light emission for noble metals. The energy forbidden light emission in the spectra observed for porphyrin molecules on Au has been discussed on the basis of strong coupling between molecules and plasmon field in STM nano-cavity. The substrate material dependence of plasmon enhancement is well reproduced by an electromagnetic calculation using the effective dielectric constant for the molecular film/substrate material.

Journal

  • Hyomen Kagaku

    Hyomen Kagaku 30 (9), 491-498, 2009

    The Surface Science Society of Japan

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