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Regensburg 2016 – scientific programme

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O: Fachverband Oberflächenphysik

O 69: Nanostructures at Surfaces: Dots, Particles, Clusters

O 69.2: Poster

Wednesday, March 9, 2016, 18:15–20:30, Poster A

Plasmonically enhanced oriented fluorescence emission in metal-insulator-metal cavities — •Fabian Goßler1, Matthias Stöter2, Thorsten Schumacher3, Markus Lippitz3, Josef Breu2, Andreas Fery1, and Tobias A.F. König11) Institute of Physical Chemistry and Polymer Physics, Leibniz Institute of Polymer Research (IPF), Hohe Str. 6, 01069 Dresden — 2Dept. of Inorganic Chemistry 1, University of Bayreuth, Universitätsstr. 30, 95440 Bayreuth — 3Dept. of Experimental Physics 3, University of Bayreuth, Universitätsstr. 30, 95440 Bayreuth

For implementation of nanophotonic devices, a short life-time and an enhancement of the spontaneous emission is necessary. We fabricate a gold film coupled anisotropic silver nanocube cavity to systematically study the fluorescence enhancement of an oriented fluorophore. For a rational design, the plasmonic properties of the silver nanocubes are designed to match with the emission spectrum of a selected fluorophore. Silicate bilayers with intercalated fluorophores are used as emitting spacer due to their regular height of 4 nm on large scales and orientation of the dye molecules. Finite-difference time-domain (FDTD) simulations, atomic force microscopy (AFM), dark field spectroscopy, confocal and time-resolved photoluminescence measurements have been used to characterize the tailormade nanocavity. Threefold emission enhancement and significantly shorter life-times are observed inside the nanocavity. Electromagnetic simulations support the results and demonstrate the potential of this cavity enhancement as building block for application in plasmonic lasers and gain-loss metamaterials.

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