Plasmon-enhanced molecular fluorescence from an organic film in a tunnel junction

Hongwen Liu, Yutaka Ie, Tatsuo Yoshinobu, Yoshio Aso, Hiroshi Iwasaki, Ryusuke Nishitani

Research output: Contribution to journalReview articlepeer-review

40 Citations (Scopus)


Scanning tunneling microscope (STM)-excited molecular fluorescence from H2 TBP porphyrin (H2 TBPP) thin films on Au (111), Ag, highly oriented pyrolytic graphite (HOPG), and indium tin oxide (ITO) surfaces has been investigated in air. Molecular fluorescence was observed from the H2 TBPP films on Au and Ag, but it was extremely weak or undetectable from films on HOPG and ITO. The maximum intensity of molecular fluorescence from H2 TBPPAg is at least 100 times stronger than that from H2 TBPPHOPG. Strong enhancement of molecular excitation by substrate surface plasmons is suggested for the STM-excited molecular fluorescence from H2 TBPP only on the noble metal substrates.

Original languageEnglish
Article number061901
JournalApplied Physics Letters
Issue number6
Publication statusPublished - 2006 Feb


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