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Excitonic Lasing in Solution-Processed Subwavelength Nanosphere Assemblies.

Kannatassen Appavoo1, Xiaoze Liu2, Vinod Menon2

  • 1Center for Functional Nanomaterials, Brookhaven National Laboratory , Upton, New York 11973, United States.

Nano Letters
|February 4, 2016
PubMed
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Researchers developed low-threshold lasing using ultrathin films of coupled zinc oxide nanospheres. This solution-processed approach enables efficient light localization for advanced optoelectronics.

Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Solution-processed nanomaterials offer potential for low-cost photonic devices.
  • Designing low-threshold lasing devices requires understanding spectral and temporal dynamics.

Purpose of the Study:

  • Demonstrate intrinsic, low-threshold lasing in ultrathin films of coupled, highly crystalline nanospheres.
  • Investigate the spectral and temporal dynamics governing this lasing behavior.

Main Methods:

  • Fabrication of ultrathin films (∼λ/4 thickness) using ∼35 nm zinc oxide nanospheres.
  • Utilized subpicosecond transient spectroscopy to quantify fluence-dependent effects.
  • Performed three-dimensional electromagnetic simulations.
Keywords:
Cavity-freeelectron−phonon couplingnear-field enhancementroom-temperature random lasingsolution-processed filmultrafast dynamics

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Main Results:

  • Achieved excitonic lasing with thresholds an order of magnitude lower than previous UV-blue lasers (<75 μJ/cm(2)).
  • Identified phonon-mediated processes influencing excitonic lasing.
  • Observed an electron-hole plasma mechanism at higher fluences.
  • Demonstrated random lasing despite violation of common criteria (e.g., optical thickness).

Conclusions:

  • Coupled, highly crystalline nanostructures are viable building blocks for high-performance optoelectronics.
  • Low-cost solution-processing methods can yield efficient lasing materials.
  • The findings challenge conventional understanding of random lasing mechanisms.