Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 50: Poster Session - Plasmonics and Nanooptics: Fabrication and Characterization

O 50.1: Poster

Dienstag, 17. März 2020, 18:15–20:00, P2/EG

Coupling of Quantum Emitters to Plasmonic Slot Waveguides — •Lok-Yee Yan, Mike Prämassing, Yuhao Zhang, Hans-Joachim Schill, and Stefan Linden — Physikalisches Institut, University of Bonn, Nußallee 12, D-53115 Bonn, Germany

Quantum emitters (QEs) coupled to plasmonic systems are considered as promising candidates for building blocks in quantum plasmonic circuits. So far, several plasmonic platforms such as silver nanowires and gold V-grooves have been exploited. The main idea behind those concepts is that one can easily tailor the electromagnetic density of states by shaping the geometry of the underlying metallic nanostructure. Here, we report on the fabrication of hybrid nanostructures consisting of colloidal semiconductor quantum dots or transition metal dichalcogenide (TMDC) monolayers, coupled to 80 nm wide slot waveguides in single-crystalline gold flakes. We use a two-step electron beam lithography process to deposit a controllable number of quantum dots on freely definable sites on the substrate while monolayers of TMDCs are prepared by mechanical exfoliation of the crystal bulk material. A focused ion beam allows us to mill the nanostructures into the gold film. Depending on the relative placement of the QEs and the plasmonic nanostructures, different coupling strengths can be achieved. We demonstrate this by imaging the fluorescence of the QEs onto an EMCCD camera and showing a reduction of lifetime as a result of an increase of the local photonic density of states.