SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 91: Plasmonics and Nanooptics V: Waveguides and Antennas
O 91.1: Vortrag
Freitag, 31. März 2023, 10:30–10:45, CHE 89
Intermediate-field coupling of single epitaxial quantum dots to plasmonic nanowires — •Michael Seidel1, Yuhui Yang2, Saimon Covre Da Silva3, Thorsten Schumacher1, Armando Rastelli3, Stephan Reitzenstein2, and Markus Lippitz1 — 1Experimental Physics III, University of Bayreuth, Germany — 2Institute of Solid State Physics, TU Berlin, Germany — 3Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, Austria
Integrated plasmonic nanocircuits are highly promising building blocks for future quantum optical applications. In combination with self-assembled epitaxially grown GaAs quantum dots as stable, bright and narrow-band single-photon sources, ultra-compact nanocircuits operating below the diffraction limit can be designed [1]. A crucial aspect is the coupling of the quantum dot emission into plasmonic waveguide modes. Typically, quantum emitters are placed in the optical near-field of a waveguide, imposing high demands on controlled nanofabrication. Furthermore, plasmonic waveguiding is drastically attenuated near high-index dielectrics due to radiative losses. We overcome these challenges by introducing a 100nm thick dieletric spacer layer, which effectively increases the propagation length and preserves acceptable coupling efficiency, resulting in a robust coupling scheme which is difficult to achieve in the near-field. We characterize the nanostructure by low-temperature photoluminescence and cathodoluminescence imaging and find good agreement to numerical simulations.
[1] Wu et al., Nano Lett. 2017, 17, 7, 4291-4296