Waitz, Reimar

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Lateral and Temporal Dependence of the Transport through an Atomic Gold Contact under Light Irradiation : Signature of Propagating Surface Plasmon Polaritons

2014, Benner, Daniel, Boneberg, Johannes, Nürnberger, Philipp, Waitz, Reimar, Leiderer, Paul, Scheer, Elke

Metallic point contacts (MPCs) with dimensions comparable to the Fermi wavelength of conduction electrons act as electronic waveguides and might operate as plasmon transmitters. Here we present a correlated study of optical and conductance response of MPCs under irradiation with laser light. For elucidating the role of surface plasmon polaritons (SPPs), we integrate line gratings into the leads that increase the SPP excitation efficiency. By analyzing spatial, polarization, and time dependence, we identify two SPP contributions that we attribute to transmitted and decaying SPPs, respectively. The results demonstrate the role of SPPs for optically controlling the transport in metallic nanostructures and are important for designing opto-nanoelectronic devices.

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Characterization and applications of plasmon fields in metal nanostructures

2011-12-23, Kolloch, Andreas, Benner, Daniel, Bädicker, Matthias, Waitz, Reimar, Geldhauser, Tobias, Boneberg, Johannes, Leiderer, Paul, Scheer, Elke

The excitation of plasmons in metallic nanostructures by light can give rise to pronounced local optical field enhancement with respect to the incident electromagnetic field. The details of these optical near fields depend sensitively on the properties of the nanostructures (material, size and shape), on the light wavelength and polarization, and also on the substrate. In this article we discuss several of these aspects influencing the near-field distribution for a given object and the resulting surface ablation by optical near fields. To this end we use both experimental and simulation techniques. Additionally we will present first results of experiments investigating the light emitted during nanoscale ablation. Finally, we will present an example how plasmon-mediated near-field effects act on the conductance of atomic-size contacts.