Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 30: Plasmonics and Nanooptics III
O 30.5: Vortrag
Dienstag, 12. März 2013, 11:30–11:45, H31
Propagating and localized surface plasmons probed in a counter-propagating photoemission electron microscopy detection scheme — •Christoph Lemke1, Till Leißner1, Alwin Klick1, Jörn Radke1, Stephan Jauernik1, Jacek Fiutowski2, Jakob Kjelstrup-Hansen2, Horst-Günter Rubahn2, and Michael Bauer1 — 1Institute for Experimental and Applied Physics, University of Kiel, D-24118 Kiel — 2Mads Clausen Institute, University of Southern Denmark, DK-6400 Sønderborg
In an interferometric time-resolved photoemission electron microscopy (ITR-PEEM) experiment, the near-field associated with propagating surface plasmon polaritons (SPP) can be locally sensed via interference with ultrashort laser pulses. In this talk, we present ITR-PEEM data of SPP propagation at a gold vacuum interface recorded in a counter-propagating pump-probe geometry. In comparison to former work this approach provides a considerably improved access to the propagation and interaction dynamics of SPP wave packets. The potential of the scheme will be illustrated by two examples: In a first experiment we monitor the propagation of a SPP wave packet along a gold vacuum interface and extract in a rather direct manner characteristic parameters such as phase and group velocity. In a further example the counter-propagating ITR-PEEM scheme is used to investigate the excitation of localized surface plasmons at defined gold nanodots via propagating SPP wave packets. The experiments enable us to directly monitor in detail the interaction dynamics between these two collective modes in time and space.