Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 21: Poster Monday: Plasmonics and Nanooptics

O 21.2: Poster

Montag, 1. April 2019, 17:45–20:00, Poster F

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

Quantum emitters 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. These concepts rely on the tight electric field confinement, hence an enhanced coupling of quantum emitters to the mode, and the guided radiation in the form of plasmon modes. We report on the fabrication of a hybrid system consisting of colloidal CdSeTe-quantum dots (QDs) and a 100 nm wide slot waveguide milled into a thermally evaporated 50 nm thick gold film. We use standard electron beam lithography in combination with an alignment process to deposit the QDs into the slot. The colloidal QDs are provided with carboxyl surface groups which enable chemical bonding to the sample surface. The QDs can launch guided surface plasmons in the slot which induce scattered photons at the end of the slot. Moreover, QDs deposited in the slot region experience an increase of the local photonic density of states which leads to a lifetime reduction of excited states. We demonstrate the coupling of QDs to the slot mode by imaging the fluorescence of the QDs onto an EMCCD camera and showing a reduction of lifetime.