Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 36: Poster Session II (Organic films and electronics, photoorganics; Nanostructures; Plasmonics and nanooptics, Surface chemical reactions and heterogeneous catalysis, Surface dynamics )

O 36.32: Poster

Dienstag, 12. März 2013, 18:15–21:45, Poster B2

Single Molecule Junctions in Strong Optical Fields — •Hai Bi, Yuxiang Gong, Daniel Gerster, Joachim Reichert, and Johannes V. Barth — Physik Department E20, TUM, Garching

In order to advance the development of unimolecular electronic devices, it is mandatory to improve understanding of electron transport in single molecules, integrated in well-dependent environment. In this respect, multi-parameter studies are required to provide more information on such systems. Here we present a method which allows us to investigate single molecule junctions in strong optical fields. The molecules are self-assembled on a planar metal substrate and contacted by a gold-covered glass tip previously introduced for scanning near-field optical microscopy. The molecules are exposed to a photon flux guided through the tetrahedral tip that at the same time provides the electrical contact. The photon flux in the molecular junctions could be determined by photocurrent measurement of single photoactive proteins [1] and reveals significant field enhancements effects at the apex of the apertureless tip. This method can be employed to investigate a variety of nearly unexplored properties in single molecule junctions such as photoconductance and photocurrent generation and allows more over for an optical characterization of the molecular junctions by vibrational spectroscopic means as well.

[1] Daniel Gerster et al., Nature Nanotech. 7, 673-676 (2012)