Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 23: Plasmonics and Nanooptics: Structure, Fabrication and Characterization

O 23.10: Vortrag

Dienstag, 17. März 2015, 12:45–13:00, MA 043

Strongly Coupled Plasmonic Modes of Self-Assembled Particles Lines in the Context of Ensemble-Averaging and Disorder — •Christian Kuttner, Christoph Hanske, Moritz Tebbe, Tobias König, and Andreas Fery — Physical Chemistry II, University of Bayreuth, 95447 Bayreuth, Germany

We present ensembles of gold nanoparticle arranged in single and double lines on solid substrates.[1] These linear assemblies were formed by template-assisted self-assembly[2,3] of monodisperse protein-coated gold nanoparticles in wrinkle templates. The substrates exhibit high structural regularity on centimeter-squared areas which allow for characterization of their extinction cross-sections by conventional UV/vis/NIR spectroscopy.

Modeling based on electrodynamic simulations shows a clear signature of strong plasmonic coupling with an interparticle spacing of 1-2 nm. We find evidence for well-defined plasmonic modes of quasi-infinite chains.[1] Beyond elementary simulations on the individual chain level, we introduce an advanced model taking parameters like the chain length distribution, ensemble-averaging, as well as interchain disorder into account.[1]

[1] C. Hanske et al. Nano Lett. 2014, in press.

[2] C. Lu et al. Soft Matter, 2007, 3, 1530-1536.

[3] N. Pazos-Perez et al. Chem. Sci., 2010, 1, 174-178.