Dresden 2009 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 16: POSTERS Polyelectrolytes and Biological Systems

CPP 16.21: Poster

Dienstag, 24. März 2009, 14:00–16:30, P3

Ultrafast dynamics in polyelectrolyte/ gold multilayer structures studied by femtosecond pump-probe spectroscopy — •Mareike Kiel1,2, Marc Herzog2, Dirk Kurth1, Wolfram Leitenberger2, Thorsten Sievers1, Helmuth Möhwald1, and Matias Bargheer1,21Max Planck Institute of Colloids and Interfaces, Research Campus Golm, 14476 Potsdam, Germany — 2Institute of Physics, University of Potsdam, 14476 Potsdam, Germany

The dynamic response of hybrid nanolayer systems composed of polyelectrolytes and gold colloids upon optical excitation is studied by ultrafast pump-probe spectroscopy. Relative intensity changes of transient absorption and reflection spectra are measured with light in the visible and near infrared region, providing information on the photoinduced dynamics within the structure. We investigate multilayer structures of gold colloid strata that are separated by several polyelectrolyte layers. The well pronounced Bragg peaks and Kiessig fringes from x-ray reflectivity measurements prove the excellent structural quality of the samples with clear separation of the gold particle layers. We observe intensity modulations due to coherently excited breathing modes in 10nm and 20nm gold particles. From the monitored transmission and reflection data we deduce the time-dependant values of the imaginary and real part of the dielectric function.

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