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Title: Probing electron transport in plasmonic molecular junctions with two-photon luminescence spectroscopy
Authors: Zhang, Q
Liu, D 
Ren, Q
Panoiu, NC
Lin, L
Ye, J
Huang, Y
Liu, SD
Leung, CW 
Lei, D
Issue Date: Jul-2021
Source: Nanophotonics, July 2021, v. 10, no. 9, p. 2467-2479
Abstract: Plasmonic core-molecule-shell (CMS) nanojunctions provide a versatile platform for studying electron transport through conductive molecules under light excitation. In general, the impact of electron transport on the near-field response of CMS nanojunctions is more prominent than on the far-field property. In this work, we use two-photon luminescence (TPL) spectroscopy to probe the effect of electron transport on the plasmonic properties of gold CMS nanojunctions. Theoretical calculations show that the TPL response of such nanojunctions is closely related to the near-field enhancement inside the metal regions, and can be strongly affected by the electron transport through the embedded molecules. TPL excitation spectroscopy results for three CMS nanojunctions (0.7, 0.9 and 1.5 nm junction widths) reveal no perceivable contribution from their low-energy plasmon modes. This observation can be well explained by a quantum-corrected model, assuming significant conductance for the molecular layers and thus efficient charge transport through the junctions. Furthermore, we explore the charge transport mechanism by investigating the junction width dependent TPL intensity under a given excitation wavelength. Our study contributes to the field of molecular electronic plasmonics through opening up a new avenue for studying quantum charge transport in molecular junctions by non-linear optical spectroscopy.
Keywords: Electron transport
Molecular electronic plasmonics
Molecular junctions
Two-photon luminescence spectroscopy
Publisher: De Gruyter
Journal: Nanophotonics 
ISSN: 2192-8606
EISSN: 2192-8614
DOI: 10.1515/nanoph-2021-0116
Rights: © 2021 Qiang Zhang et al., published by De Gruyter, Berlin/Boston
This work is licensed under the Creative Commons Attribution 4.0 nternational License (
The following publication Zhang, Q., Liu, D., Ren, Q., Panoiu, N., Lin, L., Ye, J., Huang, Y., Liu, S., Leung, C. & Lei, D. (2021). Probing electron transport in plasmonic molecular junctions with two-photon luminescence spectroscopy: . Nanophotonics, 10(9), 2467-2479 is available at
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