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O: Fachverband Oberflächenphysik

O 59: Plasmonics and Nanooptics

O 59.20: Poster

Dienstag, 21. März 2017, 18:30–20:30, P2-OG1

Fourier Analysis of Overlapping Surface Plasmon Polaritons with Different Propagation Directions — •Pascal Dreher, Pierre Kirschbaum, David Janoschka, Amran Al-Ashouri, Martin Paul Geller, Michael Horn-von Hoegen, and Frank Meyer zu Heringdorf — Faculty of Physics and Center for Nanointegration (CENIDE), Duisburg, Germany

In the past, photoemission electron microscopy (PEEM) has been proven to be an excellent tool for studying surface plasmon polaritons (SPPs). Plasmonic contrast in the real space PEEM images is generated by two photon photoemission. Using femtosecond laser pulses in a pump-probe fashion, time resolution can be achieved. The combination of PEEM and time resolved techniques provides for the spatio-temporal observation of propagating SPPs. Using normal incidence geometry, the result is a direct conceptual visualization of the SPPs.

The estimation of ratios of electric field amplitudes of overlapping SPPs with different propagation directions is a cumbersome and erroneous task, if attempted from real space PEEM images. We present a novel approach based on an FFT analysis that allows the separation of several overlapping SPPs in Fourier space. Using this approach, it was possible to extract the coefficients of transmission and reflection of plasmonic Bragg reflectors as a function of the number of reflector grooves.