Journal
NANO LETTERS
Volume 11, Issue 7, Pages 2968-2972Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl201517k
Keywords
Molecular junctions; rectification; photoassisted tunneling; plasmons
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Funding
- ISF, ISF-BIKURA
- Wolfson family charitable trust
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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.
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