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Related Experiment Video

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Compact Quantum Dots for Single-molecule Imaging
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Single Quantum Dot with Microlens and 3D-Printed Micro-objective as Integrated Bright Single-Photon Source.

Sarah Fischbach1, Alexander Schlehahn1, Alexander Thoma1

  • 1Institute of Solid State Physics, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin, Germany.

ACS Photonics
|July 4, 2017
PubMed
Summary

We developed a bright single-photon source by integrating a quantum dot microlens with a 3D-printed micro-objective. This quantum device achieves high photon extraction efficiency and low multiphoton emission for quantum communications.

Keywords:
3D direct laser writing3D lithographymicro-objectivesemiconductor quantum dotsingle-photon source

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Area of Science:

  • Quantum optics
  • Nanophotonics
  • Quantum information science

Background:

  • Integrated single-photon sources are crucial for quantum communication technologies.
  • High photon-extraction efficiency and low multiphoton emission are key performance metrics.

Purpose of the Study:

  • To demonstrate a bright single-photon source through on-chip integration.
  • To achieve high photon-extraction efficiency and suppress multiphoton emission.

Main Methods:

  • On-chip integration of a deterministic quantum dot microlens.
  • Fabrication using in situ 3D electron-beam lithography and 3D femtosecond direct laser writing.
  • Creation of a 3D-printed multilens micro-objective.

Main Results:

  • Achieved broadband photon-extraction efficiency of (40 ± 4)%.
  • Demonstrated high suppression of multiphoton emission events with g(2)(τ = 0) < 0.02.
  • Realized a high-quality quantum device with integrated optics.

Conclusions:

  • The integrated device offers a bright and efficient single-photon source.
  • Tailoring optical properties of quantum emitters with integrated optics is feasible.
  • This approach holds significant potential for plug-and-play fiber-coupled single-photon sources.