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SYSM: Single Molecule Spectroscopy of Nanoobjects

SYSM 1: Single Molecule Spectroscopy of Nanoobjects I

SYSM 1.2: Hauptvortrag

Donnerstag, 5. März 2009, 11:10–11:50, VMP 8 HS

Ultrafast spectroscopy of nanoplasmonic systems — •Markus Lippitz — 4th Physics Institute, University of Stuttgart, Stuttgart — Max-Planck-Institute for Solid State Research, Stuttgart

The strong interaction of a metal nanoparticle's free electrons with light --the particle plasmon resonance-- allows us ultrafast experiments on single metal nanoobjects. In this talk, some examples of such experiments will be presented.

A pump pulse heats the electron gas in a thin silver film. When being arranged in a Bragg structure, such films make it possible to switch the transmission of a probe pulse on a picosecond timescale.

The pump pulse also triggers mechanical oscillations of the whole metal nanostructure. As the Mie resonance depends on particle size, elastic properties of single nanoparticles can be probed all optical.

Already the presence of a plasmonic nanowire modifies the local optical density of states. This is found back in the luminescence lifetime and intensity of selfassembled GaAs quantum dots depending on the distance to the wire.