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MO: Fachverband Molekülphysik
MO 30: Poster: Photochemistry
MO 30.2: Poster
Thursday, March 17, 2011, 16:00–18:00, P1
Metallic Nanoparticles as Non-linear Optical Antennae in Photoactive Polymer Matrices — •Philipp Reichenbach1, Ulrike Georgi2, Thomas Kämpfe1, Stefan Grafström1, Brigitte Voit2, and Lukas M. Eng1 — 1Technische Universität Dresden, Institut für Angewandte Photophysik - IAPP, George-Bähr-Straße 1, 01069 Dresden, Germany — 2Leibniz-Institut für Polymerforschung - IPF, Hohe-Straße 6, 01069 Dresden, Germany
Our work deals with triggering photochemical reactions on the nanometer length scale by using strongly localized optical fields. In previous investigations, UV-based photochemical reaction were induced through fiber-based linear optical near-fields with an optical resolution on the 1 µm length scale. The goal here is to use second-harmonic radiation (SHG) generated at a metallic nanoantenna structure in order to locally induce such photochemical reactions. We use metallic nanoantennae with sharp edges and tips, serving two purposes: firstly to confine the optical field to a nanoscale area, and secondly to enhance the local SHG field considerably. Both effects are needed in order to achieve an optical resolution < 100 nm.
We embed such SHG sources into a photoreactive polymer matrix, which is photosensitive to SHG wavelength at 400 nm, but transparent at the exciting wavenength of 800 nm. Upon irradiation with 800 nm femtosecond pulses, photochemical reactions are induced in the immediate surroundings of the nanoparticle antennae via SHG. This will be proven by both direct optical means as well as topographic inspection.