Accurate determination of plasmonic fields in molecular junctions by current rectification at optical frequencies

Rani Arielly, Ayelet Ofarim, Gilad Noy, Yoram Selzer*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

78 Scopus citations

Abstract

Current rectification, i.e., induction of dc current by oscillating electromagnetic fields, is demonstrated in molecular junctions at an optical frequency. The magnitude of rectification is used to accurately determine the effective oscillating potentials in the junctions induced by the irradiating laser. Since the gap size of the junctions used in this study is precisely determined by the length of the embedded molecules, the oscillating potential can be used to calculate the plasmonic enhancement of the electromagnetic field in the junctions. With a set of junctions based on alkyl thiolated molecules with identical HOMO-LUMO gap and different lengths, an exponential dependence of the plasmonic field enhancement on gap size is observed.

Original languageEnglish
Pages (from-to)2968-2972
Number of pages5
JournalNano Letters
Volume11
Issue number7
DOIs
StatePublished - 13 Jul 2011

Keywords

  • Molecular junctions
  • photoassisted tunneling
  • plasmons
  • rectification

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