Dresden 2011 – scientific programme

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DS: Fachverband Dünne Schichten

DS 26: Plasmonics and Nanophotonics O-III (jointly with HL and O)

DS 26.3: Talk

Tuesday, March 15, 2011, 11:45–12:00, WIL A317

Surface-Plasmon-Polariton interation with gratings — •Andreas Englisch, Stefan Griesing, Uwe Schmitt, and Uwe Hartmann — Institute of Experimental Physics, Saarland University, Postfach 151150, D-66041,

Surface-Plasmon-Polaritons (SPP) couple with light through suitable periodical structures. In the case of SPP-excitation a typical decrease of the intensity in the diffracted orders can be observed. Two different kinds of gratings are investigated: periodically corrugated metal surfaces on the one hand and structured dielectric layers on flat metal surfaces on the other hand. The intensities of the diffracted orders as well as the near-field intensities are measured in dependence of the grating profile. The near-field is characterized with respect to the amplitude and the phase by the use of a phase-sensitive scanning near-field optical microscope (SNOM. Numerical modeling based on finite element simulations in Fourier space as well as in real space were performed and compared with the measurements.