Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 42: Poster Session II (Nanostructures at surfaces: arrays; Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: Other; Nanostructures at surfaces: Wires, tubes; Metal substrates: Adsorption of O and/or H; Metal substrates: Clean surfaces; Metal substrates: Adsorption of organic/bio moledules; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsorption of inorganic molecules; Metal substrates: Epitaxy and growth; Heterogeneous catalysis; Surface chemical reactions; Ab-initio approaches to excitations in condensed matter; Organic, polymeric, biomolecular films– also with adsorbates; Particles and clusters)
O 42.17: Poster
Mittwoch, 25. März 2009, 17:45–20:30, P2
Localized plasmons in defined silver microdisks investigated by PEEM — •Florian Schertz1, Jochen Maul1, Noelia Bocchio2, Andreas Unger2, Gerd Schönhense1, and Max Kreiter2 — 1Institut für Physik, Johannes Gutenberg-Universität, D-55099 Mainz — 2Max-Planck-Institut für Polymerforschung, D-55128 Mainz
Well-defined silver-disks with a diameter of 1micrometer and a height of 40nm deposited on a Si substrate are illuminated by Ti-sapphire femtosecond-laser pulses with a wavelength of 400nm corresponding to a photon energy of 3.1 eV. The emitted electrons are detected by means of a photoelectron emission microscope (PEEM).
As the electric field vector of the photons changes from p- to s-polarization, a bimodal electron emission pattern emerges, indicating the excitation of nanoplasmonic fields in the Ag particles. In addition, we observe a correlation between elliptical deformation of the area of the Ag disks with distinct photoelectron emission and the fraction of the s-polarization of the impinging photons.
Furthermore, the photoemission yield was investigated as a function of laser power revealing different power exponent dependencies for s- and p-polarized light.