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HL: Fachverband Halbleiterphysik

HL 39: Plasmonics and Nanooptics IV: Light-Matter Interaction

HL 39.4: Vortrag

Dienstag, 21. März 2017, 11:15–11:30, TRE Ma

SPP-Light Interaction in the Space-Time Domain — •David Janoschka, Pierre Kirschbaum, Pascal Dreher, Michael Horn-von Hoegen, and Frank J. Meyer zu Heringdorf — Faculty of Physics and Center for Nanointegration (CENIDE), University of Duisburg-Essen, Duisburg, Germany

Focusing of Surface Plasmon Polaritons (SPPs) with nanooptical elements extends the comprehension of nonlinear phenomena on Au surfaces. We use femtosecond-laser-pulses (<15 fs) to excite SPPs, which can be observed in a direct conceptual visualization in our Photoemission Electron Microscope (PEEM). Focused Ion Beam (FIB) milled structures on Au provide a great control over the shape of the SPP phase fronts. As such, we are able to achieve the formation of a strong SPP-field induced nanofocus with circular shaped excitation structures. This causes highly localized electron emission, exclusively by the SPP-SPP interaction, which was introduced as plasmoemission in previous work.

Here, we investigate the differences between photoemission and plasmoemission. We are in particular interested in the SPP-SPP-interaction in the presence of other nanooptical elements like nanoholes and nanoparticles, especially in the strong field enhancement caused by these nanooptical elements.