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DPG

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 59.34: Poster

Mittwoch, 24. März 2010, 17:45–20:30, Poster B1

Third harmonic generation from gold nanostructures using a femtosecond laser scanning microscope — •Siegfried Weisenburger1,2, Tobias Utikal1,2, Harald Giessen2, and Markus Lippitz1,21Max Planck Institute for Solid State Research, Stuttgart — 24th Physics Institute, University of Stuttgart

There are different competing mechanisms of third harmonic generation from gold nanostructures on a dielectric substrate: First of all third harmonic light generated at the dielectric-air interface is Rayleigh scattered at the metal structure. Furthermore the strong field enhancement in the vicinity of the plasmonic nanostructure increases the dielectric bulk third harmonic generation. Last but not least there is third harmonic generation from the particle itself due to a nonlinear potential of the metal’s conduction electrons caused by the finite size of the structure. We look into the question, which of these mechanisms dominates in which size regime the third harmonic generation from the nanostructures.

We use a titanium-sapphire laser system producing 8 fs pulses that are strongly focussed onto the samples by a reflective Cassegrain objective. The third harmonic signal at 4.6 eV is collimated by an immersion glycerin quartz objective and detected by an UV photomultiplier. The focussing properties of the Cassegrain objective and the influence of the Cassegrain on the ultrashort laser pulses are investigated experimentally and by numerical simulations. We will show the principle of a femtosecond laser scanning microscope setup as well as first experimental results on the third harmonic generation from gold nanostructures.

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