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O: Fachverband Oberflächenphysik
O 23: Symposium: Ultrafast Nanooptics III
O 23.1: Vortrag
Dienstag, 27. März 2007, 11:15–11:30, H38
Mapping the Plasmon Dynamics in Silver Nano-particles using Phase-Resolved PEEM — Jörg Lange1, Martin Rohmer1, Daniela Bayer1, Christian Schneider1, Carsten Wiemann1, Martin Aeschlimann1, and •MIchael Bauer2 — 1Fachbereich Physik, TU Kaiserslautern, 67663 Kaiserslautern — 2Institut für Experimentelle und Angewandte Physik, CAU Kiel, 24098 Kiel
Phase-resolved Two-Photon Photoemission (PR-2PPE) in combination with Photoemission Electron Microscopy (PEEM) is used to locally address the femtosecond dynamics associated with localized surface plasmon excitations (LSP) in well-defined silver nano-particles. At a lateral resolution in the sub-50 nm regime we are able to map the phase evolution of the particle-internal field as governed by the plasmon resonance energy and resonance width with sub-femtosecond accuracy. An illustrative example that will be presented is the observation of the dephasing process of the local field response between two neighbouring particles exhibiting differing plasmon energies. Furthermore we find particle-internal lateral inhomogenities in the dynamical response to the external laser-field, which we assign to the phase propagation of the excited plasmon mode through the particle.