Regensburg 2010 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 27: [O] Plasmonics and Nanooptics III (Joint Session DS/O/HL)

DS 27.6: Vortrag

Mittwoch, 24. März 2010, 11:45–12:00, H32

Near-field measurements on nanoscopic sphere-on-plane-systems by means of PEEM — •Florian Schertz1, Marcus Schmelzeisen2, Hans-Joachim Elmers1, Gerd Schönhense1, and Max Kreiter21Inst. f. Physik, Johannes Gutenberg-Universität, 55099 Mainz — 2Max-Planck-Inst. f. Polymerforschung, 55128 Mainz

Surface immobilized gold nano-spheres above a gold surface with a gap distance in the order of a nanometer act as sphere-on-plane (SOP) optical resonator systems showing unique optical properties. In the vicinity of a flat metal surface, a second resonance band red-shifted with respect to the isolated particle resonance occurs, understandable on the basis of multipole interactions of the sphere with its own mirror image in the gold film. Several theoretical and optical far-field studies of SOP resonators were performed, investigating the dependence of the resonance wavelength on the resonator geometry and dielectric properties of the spacer material [1]. The optical near-field of the system under fs-laser-radiation causes highly non-linear (n=3-5) photoemission processes strongly varying depending on the particle properties. Photoelectron microscopy turned out to be a valuable tool for the investigation of the optical near-field of individual SOPs (cf.[2]). We present the gap-resonance-induced photoemission characteristics of several SOPs (individually characterized by SEM), excited by fs-laser radiation in the range from 750nm to 850nm. This work was supported by DFG (EL172-16) and MWFZ, Univ. Mainz. [1] A. Rueda et al., J. Phys. Chem. C 112 (2008) 14801, and Refs. therein. [2] M. Cinchetti et al., Phys. Rev. Lett. 95 (2005) 047601

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