Narrow-Line Single-Molecule Transducer between Electronic Circuits and Surface Plasmons

A molecular wire containing an emitting molecular center is controllably suspended between the plasmonic electrodes of a cryogenic scanning tunneling microscope. Passing current through this circuit generates an ultranarrow-line emission at an energy of ≈1.5  eV which is assigned to the fluorescence...

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Bibliographic Details
Published in:Physical review letters 2016-01, Vol.116 (3), p.036802-036802
Main Authors: Chong, Michael C, Reecht, Gaël, Bulou, Hervé, Boeglin, Alex, Scheurer, Fabrice, Mathevet, Fabrice, Schull, Guillaume
Format: Article
Language:English
Subjects:
Electric circuits
Electrodes
Emission
Emittance
Fingerprints
Fluorescence
Plasmons
Transducers
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Description
Summary:A molecular wire containing an emitting molecular center is controllably suspended between the plasmonic electrodes of a cryogenic scanning tunneling microscope. Passing current through this circuit generates an ultranarrow-line emission at an energy of ≈1.5  eV which is assigned to the fluorescence of the molecular center. Control over the linewidth is obtained by progressively detaching the emitting unit from the surface. The recorded spectra also reveal several vibronic peaks of low intensities that can be viewed as a fingerprint of the emitter. Surface plasmons localized at the tip-sample interface are shown to play a major role in both excitation and emission of the molecular excitons.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.116.036802