Electron energy-loss spectroscopy on three dimensional plasmonic nanostructures

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In the proposed project, we intend to establish electron energy loss spectroscopy (EELS) as a versatile characterization method for the plasmonic near-field of three dimensional metallic nanostructures. For this purpose, we will perform proof-of-principle studies on a number of different plasmonic systems whose specific properties result from the three-dimensional shape of the structures or depend critically on their thickness. In contrast to most previous experiments, in which the nanostructures have been examined with the electron beam only from a single direction, we will use angular resolved EELS to probe different vector components of the plasmonic near-field. The combination of spatially resolved spectroscopy with EELS and optical far-field spectroscopy will allow us to trace back the optical properties of the three-dimensional plasmonic systems to their specific near-field distributions.