Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 23: Plasmonics and Nanooptics: Light-Matter Interaction, Spectroscopy
O 23.20: Poster
Montag, 7. März 2016, 18:15–20:30, Poster E
Tuning the plasmon-exciton resonance of Gold-TDBC core-shell particles via the surrounding medium — •Felix Stete1,2, Wouter Koopman1, and Matias Bargheer1,3 — 1Universität Potsdam, Institut für Physik und Astronomie, 14476 Potsdam, Germany — 2Humboldt-Universität zu Berlin, School of Analytical Sciences Adlershof (SALSA), 10099 Berlin, Germany — 3Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Wilhelm-Conrad-Röntgen Campus, BESSY II, 12489 Berlin, Germany
We present a method to tune the resonance frequencies of a plasmon-exciton system leading to an anti-crossing of the resonance peaks. The investigated plasmon-exciton system is given by gold nanospheres coated with the cyanine dye TDBC. The surrounding medium is gradually changed by a layer-by-layer deposition of polyelectrolytes with alternating charge forming well-defined double layers. We explain the dependence of the core-shell particles' spectrum on the surrounding medium by the shift of the uncoupled plasmon resonance given by the effective dielectric function of the composite particle-air-polyelectrolyte medium. The uncoupled exciton resonance is approximately unchanged by the changing environment. The strong coupling characteristics of the plasmon-exciton system are demonstrated by an anti-crossing behaviour of the resonance peaks.