Waveguide-integrated colloidal nanocrystal supraparticle lasers

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Abstract

Supraparticle (SP) microlasers fabricated by the self-assembly of colloidal nanocrystals have great potential as coherent optical sources for integrated photonics. However, their deterministic placement for integration with other photonic elements remains an unsolved challenge. In this work, we demonstrate the manipulation and printing of individual SP microlasers, laying the foundation for their use in more complex photonic integrated circuits. We fabricate CdSxSe1−x/ZnS colloidal quantum dot (CQD) SPs with diameters from 4 to 20 μm and Q-factors of approximately 300 via an oil-in-water self-assembly process. Under a subnanosecond-pulse optical excitation at 532 nm, the laser threshold is reached at an average number of excitons per CQD of 2.6, with modes oscillating between 625 and 655 nm. Microtransfer printing is used to pick up individual CQD SPs from an initial substrate and move them to a different one without affecting their capability for lasing. As a proof of concept, a CQD SP is printed on the side of an SU-8 waveguide, and its modes are successfully coupled to the waveguide.
Original languageEnglish
Pages (from-to)1836-1846
Number of pages11
JournalACS Applied Optical Materials
Volume1
Issue number11
Early online date15 Nov 2023
DOIs
Publication statusPublished - 24 Nov 2023

Keywords

  • semiconductor nanocrystals
  • microresonators
  • Whispering Gallery Modes
  • self-assembly
  • supraparticles
  • transfer printing
  • integrated photonics

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