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  Near-Field Spectral Response of Optically Excited Scanning Tunneling Microscope Junctions Probed by Single-Molecule Action Spectroscopy

Böckmann, H., Müller, M., Hammud, A., Willinger, M. G., Pszona, M., Waluk, J., et al. (2019). Near-Field Spectral Response of Optically Excited Scanning Tunneling Microscope Junctions Probed by Single-Molecule Action Spectroscopy. The Journal of Physical Chemistry Letters, 10, 2068-2074. doi:10.1021/acs.jpclett.9b00822.

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acs.jpclett.9b00822-1.pdf (Publisher version), 4MB
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 Creators:
Böckmann, Hannes1, Author              
Müller, Melanie1, Author              
Hammud, Adnan2, Author              
Willinger, Marc Georg2, Author              
Pszona, Maria3, Author
Waluk, Jacek3, 4, Author
Wolf, Martin1, Author              
Kumagai, Takashi1, 5, Author              
Affiliations:
1Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
2Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
3Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, Warsaw 01-224, Poland, ou_persistent22              
4Faculty of Mathematics and Natural Sciences, College of Science, Cardinal Stefan Wyszyński University, Dewajtis 5, 01-815 Warsaw, Poland, ou_persistent22              
5JST-PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan, ou_persistent22              

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 Abstract: The near-field spectral response of metallic nanocavities is a key characteristic in plasmon-assisted photophysical and photochemical processes. Here, we show that the near-field spectral response of an optically excited plasmonic scanning tunneling microscope (STM) junction can be probed by single-molecule reactions that serve as a nanoscale sensor detecting the local field intensity. Near-field action spectroscopy for the cis ↔ cis tautomerization of porphycene on a Cu(110) surface reveals that the field enhancement in the STM junction largely depends on microscopic structures not only on the tip apex, but also on its shaft. Using nanofabrication of Au tips with focused ion beam, we show that the spectral response is strongly modulated through the interference between the localized surface plasmon in the junction and propagating surface plasmon polariton generated on the shaft. Furthermore, it is demonstrated that the near-field spectral response can be manipulated by precisely shaping the tip shaft.

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Language(s): eng - English
 Dates: 2019-03-222019-04-082019-04-09
 Publication Status: Published online
 Pages: 7
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/acs.jpclett.9b00822
 Degree: -

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Title: The Journal of Physical Chemistry Letters
  Abbreviation : J. Phys. Chem. Lett.
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: 7 Volume / Issue: 10 Sequence Number: - Start / End Page: 2068 - 2074 Identifier: CoNE: https://pure.mpg.de/cone/journals/resource/1948-7185