Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 75: Plasmonics and Nanooptics
O 75.1: Poster
Mittwoch, 18. März 2015, 18:15–21:00, Poster A
Control of light-SPP coupling at step edges by local interference — •Alwin Klick1, Sergio de la Cruz2, Christoph Lemke1, Malte Großmann1, Hauke Beyer1, Jacek Fiutowski3, Jakob Kjelstrup-hansen3, Horst-Günter Rubahn3, Eugenio R. Méndez2, and Michael Bauer1 — 1Institute for Experimental and Applied Physics, University of Kiel, Leibnizstr. 19, 24118 Kiel, Germany — 2División de Física Applicada, Centro de Investigación Científica y de Educación Superior de Ensenada, Carretera Ensenada-Tijuana No. 3918, Ensenada 22860, BC, Mexico — 3Mads Clausen Institute, University of Southern Denmark, NanoSYD Alsion 2, 6400 Sønderborg, Denmark
A combined experimental and theoretical study on the efficiency of laser-induced surface plasmon polariton (SPP) excitation at defined step edges at a gold-vacuum interface as one of the most basic coupling geometries is presented. As a relevant parameter determining the coupling efficiency we identify the ratio between step height h and excitation wavelength λ [1]. For specific values of h/λ a substantial suppression of laser-SPP coupling is observed arising from destructive interference of the laser field reflected at the two step levels, respectively. Experiment and theory show, furthermore, that the interference affects also the phase of the SPP with respect to the exciting laser field.
[1] De la Cruz, S. et al., 2012. Physica Status Solidi (B), 249(6).