Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 59: Poster Session II (Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: arrays; Nanostructures at surfaces: Wires, tubes; Nanostructures at surfaces: Other; Plasmonics and nanooptics; Metal substrates: Epitaxy and growth; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsoprtion of organic / bio molecules; Metal substrates: Adsoprtion of inorganic molecules; Metal substrates: Adsoprtion of O and/or H; Metal substrates: Clean surfaces; Density functional theory and beyond for real materials)
O 59.54: Poster
Mittwoch, 24. März 2010, 17:45–20:30, Poster B1
Pump-probe apertureless near-field microscopy - a Tool for time resolved Nanooptics — •Marcus Rommel1,2, Stephanie Essig1,3, Ralf Vogelgesang1, and Markus Lippitz1,3 — 1Planck Institute for Solid State Research, Stuttgart, Germany — 2Department of Experimental Physics 5, University of Würzburg, Würzburg, Germany — 34th Physics Institute, University of Stuttgart, Stuttgart, Germany
We develop a pump-probe apertureless scanning near-field optical microscope (PPaSNOM) to analyze plasmonic structures. This setup allows us to detect the temporal and spatial dependence of localized surface plasmon resonances (LSPR) as well as propagating SPRs. One of the first applications of this instrument will be the investigation of acoustic vibrations in single plasmonic particles of different shape.
As LSPR's depend sensitively on the electron density, the changes in volume due to GHz acoustic oscillations can be tracked with time-resolving pump-probe experiments [1]. The optical near-field indirectly contains information on the structure's acoustic oscillation. This allow us to extract nanoscale Chladni figures, i.e., maps of the acoustic vibration amplitude on the particle surface.
[1]M. A. van Dijk, M. Lippitz, M. Orrit, Detection of acoustic oscillations of single gold nanospheres by timeresolved interferometry, Phys. Rev. Lett. 2005, 95, 267 406.