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Intrinsic polarization control in rectangular GaN nanowire lasers.

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Researchers achieved polarized lasing in gallium nitride (GaN) nanowires by controlling their rectangular shape. This method offers inherent polarization control for nanowire lasers without external substrates.

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Gallium nitride (GaN) nanowires are promising for optoelectronic applications.
  • Controlling polarization in nanowire lasers is crucial for device performance.
  • Existing methods for polarization control often require specific substrates or complex fabrication.

Purpose of the Study:

  • To demonstrate intrinsic, linearly polarized lasing from single GaN nanowires.
  • To investigate the effect of cross-sectional shape on laser polarization.
  • To establish a fabrication method for controllable nanowire cross-sections.

Main Methods:

  • A two-step top-down fabrication approach was used to create straight GaN nanowires.
  • Controllable rectangular cross-sections were engineered.
  • Optical pumping was employed to induce and measure lasing properties at room temperature.

Main Results:

  • Achieved lasing with a clear threshold of 444 kW cm(-2) and a narrow spectral line width of 0.16 nm.
  • Demonstrated linearly polarized lasing along the short dimension (y-direction) of the rectangular nanowires.
  • Observed higher transverse confinement factors for y-polarized modes due to the rectangular cross-section.

Conclusions:

  • Cross-sectional shape control provides intrinsic polarization control for GaN nanowire lasers.
  • This approach eliminates the need for external elements like lossy substrates for polarization management.
  • The findings enable the development of advanced, polarization-controlled nanowire-based optoelectronic devices.