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Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
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Robust Whispering-Gallery-Mode Microbubble Lasers from Colloidal Quantum Dots.

Yue Wang, Van Duong Ta1, Kheng Swee Leck2

  • 1Department of Physics, King's College London , Strand, London, WC2R 2LS, United Kingdom.

Nano Letters
|March 14, 2017
PubMed
Summary
This summary is machine-generated.

Colloidal quantum dot (CQD) microbubble lasers offer tunable visible emission and over a year of stability. This breakthrough advances CQD microlasers for photonics and optoelectronics applications.

Keywords:
Microlasermicrobubblenanocompositesquantum dotwhispering-gallery-mode

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Area of Science:

  • Photonics and Optoelectronics
  • Materials Science

Background:

  • Colloidal quantum dots (CQDs) are promising optical gain materials for microlasers due to tunable emission and solution processability.
  • Developing cost-effective, high-performance CQD microlasers with long-term stability remains a significant challenge.

Purpose of the Study:

  • To develop a novel, stable, and tunable CQD-based microlaser.
  • To investigate the potential of CQD/PMMA nanocomposites for microbubble laser fabrication.
  • To demonstrate the application of these microlasers in sensing.

Main Methods:

  • Fabrication of hybrid CQD/poly(methyl methacrylate) (PMMA) nanocomposite microbubbles.
  • Analysis of microbubble formation mechanism during droplet drying.
  • Characterization of laser performance and long-term stability.
  • Demonstration of water vapor sensing capability.

Main Results:

  • A unique method for forming stable whispering-gallery-mode (WGM) microbubble lasers from CQD/PMMA nanocomposites.
  • Tunable lasing emission across the visible spectrum by changing CQDs.
  • Exceptional long-term stability exceeding one year.
  • Proof-of-concept demonstration of water vapor sensing.

Conclusions:

  • The developed microbubble lasers offer a stable, tunable, and cost-effective platform for CQD-based microlasers.
  • This approach overcomes critical stability issues, paving the way for practical CQD microlaser applications.
  • The results open new avenues for advanced photonics and optoelectronics, including sensing applications.