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O: Fachverband Oberflächenphysik
O 36: Poster Session II (Organic films and electronics, photoorganics; Nanostructures; Plasmonics and nanooptics, Surface chemical reactions and heterogeneous catalysis, Surface dynamics )
O 36.41: Poster
Tuesday, March 12, 2013, 18:15–21:45, Poster B2
Multi-photon photoelectron microscopy study of plasmonic silver structures and their interaction with porphyrin molecules — •Klaus Stallberg1,3, Gerhard Lilienkamp1, Herbert Pfnür2,3, and Winfried Daum1,3 — 1Institute of Energy Research and Physical Technologies, TU Clausthal, Leibnizstr. 4, 38678 Clausthal-Zellerfeld — 2Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstr. 2, 30167 Hannover — 3NTH School for Contacts in Nanosystems
Localized surface plasmons (LSPs) in metallic nanostructures provide strong field enhancement upon resonant irradiation with light of appropriate wavelength and thus strongly increase the efficiency of nonlinear optical processes such as multi-photon absorption. Moreover, previous studies in the frequency and time domain showed strong coupling of molecular excitations in light-absorbing molecules with surface plasmons of metallic surfaces and plasmonic nanostructures. In this contribution we apply energy-resolved photoelectron emission microscopy (PEEM) with short laser pulse excitation to study the role of plasmonic enhancement for two-photon photoemission from porphyrin molecular layers (Mg:TPP). As substrates for our experiments we use different silver structures epitaxially grown on Si(111)-(7x7) and Si(100)-(2x1) substrates. Variation of the structure size allows for a tuning of the LSP resonance to match the absorption band of the porphyrin molecules. The effect of plasmonic enhancement in two-photon photoemission from these systems is studied in detail by variation of the photon excitation energy.