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Related Experiment Videos

Single gallium nitride nanowire lasers.

Justin C Johnson1, Heon-Jin Choi, Kelly P Knutsen

  • 1Department of Chemistry, University of California, Berkeley, California 94720-1460, USA.

Nature Materials
|March 6, 2003
PubMed
Summary

Researchers observed ultraviolet-blue laser action in single gallium nitride (GaN) nanowires at room temperature. This breakthrough advances nanowire-based coherent light sources for future optoelectronic devices.

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Area of Science:

  • Nanotechnology
  • Optoelectronics
  • Materials Science

Background:

  • Semiconductor nanowires offer unique optical properties due to their geometry and quantum confinement.
  • Gallium nitride (GaN) is a key wide-bandgap material for ultraviolet-blue optoelectronic devices.
  • Advancements in microfabrication enable stimulated emission in GaN microstructures.

Purpose of the Study:

  • To report the observation of ultraviolet-blue laser action in single monocrystalline GaN nanowires.
  • To characterize the optical properties and waveguide modes of these nanowires.
  • To investigate the gain mechanism responsible for laser action at room temperature.

Main Methods:

  • Utilized near-field and far-field optical microscopy.
  • Analyzed waveguide mode structure and spectral properties.

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  • Investigated pump power dependence of the emission spectrum.

    • Main Results:

    • Observed ultraviolet-blue laser action in single GaN nanowires at room temperature.
    • Identified axial Fabry-Perot modes (Q ~ 10^3) consistent with cylindrical cavity geometry.
    • Demonstrated a pump power-dependent redshift, indicating an electron-hole plasma gain mechanism.

    Conclusions:

    • Single monocrystalline GaN nanowires can function as ultraviolet-blue lasers.
    • The cylindrical geometry supports Fabry-Perot modes for lasing.
    • Electron-hole plasma gain is the primary mechanism at room temperature, paving the way for nanowire-based coherent light sources.