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O: Fachverband Oberflächenphysik

O 33: Nanostructures at Surfaces: Metals, Oxides and Semiconductors I

O 33.2: Vortrag

Dienstag, 21. März 2017, 10:45–11:00, REC/PHY C213

Effect of Substrate on Plasmonic Signatures of Silver Nanoparticles studied by Photoemission Electron Microscopy — •Kevin Oldenburg, Hannes Hartmann, Karl-Heinz Meiwes-Broer, Sylvia Speller, and Ingo Barke — University of Rostock, Institute of Physics, 18059 Rostock, Germany

The plasmonic response of metal nanostructures not only depends on material, shape and size but also on coupling phenomena to the environment. By optical excitation close to the resonance wavelength, efficient electron emission can be triggered which is accessible using photoemission electron microscopy (PEEM) with spatial, energetic, and angular resolution [1]. Here the electron emission of individual silver nanoparticles in the size range between 5 and 30 nm is measured using fs laser excitation between 355 nm and 460 nm. The data are correlated to geometric properties obtained by atomic force microscopy (AFM). The clusters were produced in the gas phase and soft-landed onto natively oxidized Si(111) and Si(111)-(7x7) to access the role of cluster-surface interaction.

[1] M. Rohmer et al., Phys. Stat. Sol. B 247, 1132 (2010).