Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 59: Photonics and Nanooptics III: Fabrication and Characterization

O 59.4: Vortrag

Mittwoch, 9. März 2016, 15:45–16:00, S051

Bottom-up synthesis of large area single-crystalline atomically flat gold flakes with single-crystalline silver cubes as single quantum emitter nanoantennas — •Simon Ristok, Bettina Frank, and Harald Gießen — University of Stuttgart, 4th Physics Institute and Research Center SCoPE, Pfaffenwaldring 57, 70569 Stuttgart, Germany

When using quantum emitters such as NV centers in diamond, quantum dots, or dye molecules as effective photon sources, it is often necessary to control certain characteristics of the emitted radiation, i.e., the emission rate and direction. A promising approach is the coupling of the emitters to a plasmonic nanoantenna. In this work, we fabricate plasmonic nanopatch antennas using exclusively bottom-up methods. The antennas consist of silver nanocubes which are positioned over the atomically flat surface of a gold microplatelet. Both Ag nanocubes and Au microplatelets are single-crystalline and are separated by a dielectric polymer spacer layer. The plasmonic resonance of the antennas can be tuned by varying the size of the Ag nanocubes and the thickness of the nm-thick spacer layer. The further steps include the embedding of fluorescent dye molecules into the gap of the nanopatch antenna, followed by fluorescence enhancement and lifetime measurements. Investigating this system can help us understand the prerequisites to expand the range of emitters also to NV centers and quantum dots.