Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 27: Poster Session I (Methods: Scanning probe techniques; Methods: Atomic and electronic structure; Methods: Molecular simulations and statistical mechanics; Oxides and Insulators: Clean surfaces; Oxides and Insulators: Adsorption; Oxides and Insulators: Epitaxy and growth; Semiconductor substrates: Clean surfaces; Semiconductor substrates: Epitaxy and growth; Semiconductor substrates: Adsorption; Nano- optics of metallic and semiconducting nanostructures; Electronic structure; Methods: Electronic structure theory; Methods: other (experimental); Methods: other (theory); Solutions on surfaces; Epitaxial Graphene; Surface oder interface magnetism; Phase transitions; Time-resolved spectroscopies)
O 27.67: Poster
Dienstag, 24. März 2009, 18:30–21:00, P2
Near Field Distribution of Nanostructures with Electromagnetic Coupling — •Pascal Melchior1, Martin Rohmer1, Christian Schneider1, Daniela Bayer1, Alexander Fischer1, Mirko Cinchetti1, Daniel Benner2, Johannes Boneberg2, Paul Leiderer2, and Martin Aeschlimann2 — 1Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, 67663 Kaiserslautern, Germany — 2Department of Physics, University of Konstanz, 78457 Konstanz, Germany
Nonlinear photoemission electron microscopy (PEEM) is a powerful tool to directly image the near field distribution of nanostructures. On the other hand, two-photon photoemission (2PPE) spectroscopy allows the investigation of electron dynamics following the excitation with a laser pulse. As follows from Fermi-liquid theory, the electron dynamics strongly depend on the energy.
We combined a PEEM instrument with time-resolved 2PPE and time-of-flight detector (ToF) to simultanously access space, time and energy. This gives the unique possibility to study the electron dynamics at nanostructured sufaces and the influence of near field enhancement on the dynamics not only with highest spatial and temporal resolution but also with the option of spectroscopic analysis of the photoemitted electrons. In particular, we devoted our attention to investigate the influence of coupling effects on the near field distribution of nanostructures with varying dimer distance, the dominant parameter that characterizes the coupling.