Erlangen 2022 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 41: Nano-Optics

Q 41.12: Poster

Mittwoch, 16. März 2022, 16:30–18:30, P

High-yield placement of colloidal quantum dot single-photon sources on nanophotonic chips — •Tobias Spiekermann, Alexander Eich, Helge Gehring, Lisa Sommer, Julian Bankwitz, Wolfram Pernice, and Carsten Schuck — Institute of Physics, University of Münster, Germany

Integrated photonics benefits many quantum technology applications because it allows for replicating crucial circuit components with high yield and high reproducibility. While the integration of single-photon sources with nanophotonic devices has recently been achieved [1], extending the approach to larger numbers of independently controllable emitters has remained challenging. Here we introduce an iterative procedure for site-selective placement of individual colloidal quantum dots (CQD) that provides means for embedding single-photon sources with high yield into photonic integrated circuits at wafer-scale. We lithographically pattern arrays of apertures in polymer thin films, apply CQDs in solution to the sample and remove excess emitters in a lift-off process. We assess emitter placement at aperture positions via confocal microscopy and repeat the process with a modified lithography mask that only contains aperture locations which had remained vacant. This iterative procedure quickly converges towards high-yield and we confirm single-photon emission from predefined sites by recording second-order autocorrelation functions. We further passivate CQD-sites employing atomic layer deposition of alumina (Al₂O₃), which benefits the emitters photostability.

[1] Alexander Eich et al., arXiv:2104.11830, (2021)