Plasmon-induced conductance enhancement in single-molecule junctions

Michal Vadai; Nirit Nachman; Matan Ben-Zion; Marius Bürkle; Fabian Pauly; Juan Carlos Cuevas; Yoram Selzer

doi:10.1021/jz4014008

Plasmon-induced conductance enhancement in single-molecule junctions

Michal Vadai, Nirit Nachman, Matan Ben-Zion, Marius Bürkle, Fabian Pauly, Juan Carlos Cuevas, Yoram Selzer^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

The effect of surface plasmons on the conductance of single-molecule junctions is studied using a squeezable break junction setup. We show that the conductance of 2,7-diaminofluorene single-molecule junctions can be enhanced upon laser irradiation. Our experimental approach enables us to show that this enhancement is due to the plasmon-induced oscillating field within the nanoscale metal gap of the junctions. The effective plasmon field enhancement within the gap is calculated to be ∼1000. The experimental procedure presented in this work, which enables one to explore the coupling between plasmons and molecular excitations via transport measurements, could potentially become a valuable tool in the field of plexcitonics.

Original language	English
Pages (from-to)	2811-2816
Number of pages	6
Journal	Journal of Physical Chemistry Letters
Volume	4
Issue number	17
DOIs	https://doi.org/10.1021/jz4014008
State	Published - 5 Sep 2013

Keywords

break junction
photoassisted transport
plasmons
rectification
single molecule

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10.1021/jz4014008

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abstract = "The effect of surface plasmons on the conductance of single-molecule junctions is studied using a squeezable break junction setup. We show that the conductance of 2,7-diaminofluorene single-molecule junctions can be enhanced upon laser irradiation. Our experimental approach enables us to show that this enhancement is due to the plasmon-induced oscillating field within the nanoscale metal gap of the junctions. The effective plasmon field enhancement within the gap is calculated to be ∼1000. The experimental procedure presented in this work, which enables one to explore the coupling between plasmons and molecular excitations via transport measurements, could potentially become a valuable tool in the field of plexcitonics.",

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AU - Vadai, Michal

AU - Nachman, Nirit

AU - Ben-Zion, Matan

AU - Bürkle, Marius

AU - Pauly, Fabian

AU - Cuevas, Juan Carlos

AU - Selzer, Yoram

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AB - The effect of surface plasmons on the conductance of single-molecule junctions is studied using a squeezable break junction setup. We show that the conductance of 2,7-diaminofluorene single-molecule junctions can be enhanced upon laser irradiation. Our experimental approach enables us to show that this enhancement is due to the plasmon-induced oscillating field within the nanoscale metal gap of the junctions. The effective plasmon field enhancement within the gap is calculated to be ∼1000. The experimental procedure presented in this work, which enables one to explore the coupling between plasmons and molecular excitations via transport measurements, could potentially become a valuable tool in the field of plexcitonics.

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Plasmon-induced conductance enhancement in single-molecule junctions

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