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Max Schnepf1 2 Fabian Goßler1 2 Tobias König1 2

1, Leibniz-Institute for Polymer Research, Dresden, , Germany
2, Cluster of Excellence Center for Advancing Electronics Dresden, TU Dresden, Dresden, , Germany

We present a film-coupled colloidal building-block, comprising of a plasmonic core surrounded by a dielectric shell containing a fluorophore emitter. Due to the small mode volume and the strong loss rate, fluorescent lifetime of the emitter is significantly reduced and the emission rate is enhanced while the energy of the emitted photons remains unaffected.[1] We systematically study the energy transfer mechanism on the single particle level by employing electron microscopy, scattering spectroscopy, fluorescence life-time imaging (FLIM) and time-correlated single photon counting on the same cavity.[2] Moving from single cavities towards periodically arranged gain and loss materials with periodicities close the optical wavelength range, unique properties result from the energetic coupling of those building blocks. In order to investigate the arising properties on a large scale, we fabricated novel quantum dot lattices and coupled them to periodic plasmonic nanostructures using self-assembly of colloidal particles as fabrication method.[2] By combination of the two lattices with different overlap and at different angles, energy transfer of the coupled structures can be studied comprehensively. This will help to fabricate large scale structures featuring optical band gap structures for unique light matter interactions.

[1] Max J Schnepf, et al., Z. Phys. Chem., 2018, 232 (9-11), 1593-1606
[2] Oleksandr Stroyuk, et al, J. Phys. Chem. C, 2018, 12, 25, 13648-13658
[3] Martin Mayer, et al., Adv. Opt. Mater, 2019, 7, 1800564

Acknowledgement: This project was financially supported by the Volkswagen Foundation through a Freigeist Fellowship to Tobias A.F. König. The authors acknowledge the Deutsche Forschungsgemeinschaft (DFG) within the Cluster of Excellence ‘Center for Advancing Electronics Dresden’ (cfaed) for financial
support.

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