Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 74: Plasmonics and nanooptics IV
O 74.6: Vortrag
Donnerstag, 29. März 2012, 17:15–17:30, MA 005
Surface plasmon near-field intensity switching using spectral intensity variation combined with photoemission electron microscopy — •Christian Schneider1, Martin Piecuch1, Daniela Bayer1, Alexander Fischer1, Pascal Melchior1, Christoph Lemke2, Michael Bauer2, and Martin Aeschlimann1 — 1Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, 67663 Kaiserslautern — 2Institut für Experimentelle und Angewandte Physik, Universität Kiel, 24118 Kiel
The physical effects at interfaces between metallic and dielectric media attract more and more attention due to the possibility to generate collective electron density oscillations. These propagating surface plasmon polaritons (SPPs) open the opportunity to guide the electrical field energy. By tailoring a gold microstructure in an appropriate manner, we are able to focus the electrical field energy at a given point of the structure. In addition, based on the coherence between the SPP and the light pulse the field concentration can be switched on and off by alternating the laser pulse spectrum. Applying photoemission electron microscopy (PEEM) as a near field probe and our fast and effective algorithm based on Huygens principle, we can experimentally and theoretially show that by altering the spectral intensity of a 30 fs laser pulse at 800 nm using a Mach-Zehnder-interferometer, we are able to shift the electrical field energy in a controlled manner. First consistent results comparing simulated and measured data of a Fresnel type focusing device show a very good agreement.