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Regensburg 2010 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 36: Poster: Nanoparticles and Composite Materials

CPP 36.22: Poster

Wednesday, March 24, 2010, 17:30–19:00, Poster B2

Femtosecond pump-probe spectroscopy of the dielectric function of a polymer matrix with embedded gold nanoparticles — •Mareike Kiel1,2, Peter Gaal1, Marc Herzog1, Wolfram Leitenberger1, Steffen Mitzscherling1, Torsten Sievers2, Helmuth Möhwald2, and Matias Bargheer1,21Universität Potsdam, 14476 Potsdam — 2Max-Planck-Institut für Kolloid- und Grenzflächenforschung, 14476 Potsdam

We investigate a multilayered compound system of polyelectrolytes and gold nanoparticles with femtosecond pump-probe spectroscopy. A 530nm pump beam excites the electronic system of the nanoparticles, which triggers a breathing mode by electron-phonon coupling and causes strong changes in the dielectric function of the compound material. Relative changes of transient absorption and reflection spectra are measured simultaneously with light in the visible and near infrared region. From this we directly obtain the changes in the real and imaginary part of the compound's dielectric function. By comparison of measurements at near infrared and visible probe wavelengths and application of analytical models, we can separate the contributions from interband and intraband absorption. We also decompose the static absorption spectra into its scattering, plasmon absorption and interference components.

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