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Ultralow-threshold multiphoton-pumped lasing from colloidal nanoplatelets in solution.

Mingjie Li1, Min Zhi1, Hai Zhu1

  • 1Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore.

Nature Communications
|October 1, 2015
PubMed
Summary
This summary is machine-generated.

Colloidal semiconductor nanoplatelets enable highly photostable, ultralow-threshold multiphoton-pumped lasing in liquid lasers. Optimized nanoplatelet size minimizes threshold, advancing nonlinear optofluidics and biophotonics applications.

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Area of Science:

  • Materials Science
  • Optics
  • Nanotechnology

Background:

  • Organic dyes used in multiphoton-pumped lasers have limitations including small absorption cross-sections and poor photostability.
  • Emerging fields like nonlinear optofluidics and biophotonics require efficient and stable gain media for frequency-upconversion liquid lasers.

Purpose of the Study:

  • To demonstrate multiphoton-pumped biexcitonic lasing using colloidal CdSe/CdS nanoplatelets.
  • To investigate the effect of nanoplatelet size on lasing threshold and photostability.
  • To establish colloidal semiconductor nanoparticles as viable gain media for high-performance liquid lasers.

Main Methods:

  • Fabrication of colloidal CdSe/CdS nanoplatelets.
  • Integration of nanoplatelets into a cuvette-based Fabry-Pérot optical resonator.
  • Characterization of lasing properties including threshold, gain cross-section, and photostability under two-photon and three-photon excitation.

Main Results:

  • Achieved highly photostable, ultralow-threshold multiphoton-pumped biexcitonic lasing.
  • Identified an optimal lateral size for nanoplatelets that minimizes the lasing threshold.
  • Demonstrated large gain cross-sections (7.3 × 10⁻¹⁴ cm²) and ultralow thresholds (1.2-4.3 mJ cm⁻²).
  • Observed no significant photodegradation over 10⁷ laser shots, indicating excellent photostability.

Conclusions:

  • Colloidal CdSe/CdS nanoplatelets offer superior performance compared to traditional organic dyes for multiphoton-pumped liquid lasers.
  • Nanoplatelet size is a critical parameter for optimizing lasing efficiency.
  • These findings highlight the potential of colloidal semiconductor nanoparticles for advanced photonic applications.