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Waveguide-Integrated Colloidal Nanocrystal Supraparticle Lasers.

Pedro Urbano Alves1, Benoit J E Guilhabert1, John R McPhillimy1

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Summary
This summary is machine-generated.

Researchers demonstrate printing individual supraparticle (SP) microlasers made from colloidal quantum dots (CQDs). This breakthrough enables precise placement for advanced photonic integrated circuits.

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Area of Science:

  • Photonics
  • Materials Science
  • Nanotechnology

Background:

  • Supraparticle (SP) microlasers from colloidal nanocrystals offer potential for integrated photonics.
  • Deterministic placement of these microlasers for integration is a significant challenge.

Purpose of the Study:

  • To demonstrate the manipulation and printing of individual SP microlasers.
  • To lay the foundation for their integration into complex photonic circuits.

Main Methods:

  • Fabrication of CdSxSe1-x/ZnS colloidal quantum dot (CQD) SPs (4-20 μm diameter) using oil-in-water self-assembly.
  • Optical characterization under 532 nm excitation, revealing laser modes between 625-655 nm.
  • Microtransfer printing for precise pickup and placement of individual CQD SPs.

Main Results:

  • CQD SPs with Q-factors ~300 were fabricated.
  • Lasing threshold achieved at an average of 2.6 excitons per CQD.
  • Individual CQD SPs were successfully printed onto new substrates without impacting lasing.
  • Demonstrated successful coupling of a printed CQD SP's modes to an SU-8 waveguide.

Conclusions:

  • The developed microtransfer printing technique enables deterministic placement of CQD SP microlasers.
  • This method is crucial for fabricating advanced photonic integrated circuits.
  • The results pave the way for on-demand integration of coherent optical sources.