Berlin 2012 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 8: Poster: Nanoparticles and Composite Materials
CPP 8.20: Poster
Monday, March 26, 2012, 17:30–20:00, Poster A
Measuring the range of plasmonic interaction — Mareike Kiel1, Madlen Klötze1, •Steffen Mitzscherling1, and Matias Bargheer1,2 — 1Institute of Physics and Astronomy, University of Potsdam — 2Helmholtz Zentrum Berlin
When gold nanoparticles are covered with nanometric layers of transparent polyelectrolytes, the plasmon absorption spectrum A(λ) increases by a factor of approximately three and shifts to the red. These modifications of dissipative experimental observables stop when the covering layers become thicker than the particle diameter. The spectral modification of dispersive parameters like the reflection R, however, keeps changing with increasing cover layer thickness. The shift of the plasmon resonance caused by two interacting particle layers is studied as a function of the separating distance between the two layers. We discuss these observations in the context of an effective medium theory and conclude that it can only be applied for a layer thickness on the order of the particle diameter.