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Monolithic electrically injected nanowire array edge-emitting laser on (001) silicon.

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Summary

Researchers developed the first electrically pumped InGaN/GaN green laser on a silicon substrate. This breakthrough enables integrated silicon photonics and diverse applications like solid-state lighting and displays.

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Area of Science:

  • Semiconductor Physics
  • Materials Science
  • Optoelectronics

Background:

  • Achieving electrically pumped silicon-based lasers is a significant scientific and engineering challenge.
  • Integration of optoelectronic devices with silicon platforms is crucial for advanced technologies.

Purpose of the Study:

  • To demonstrate the first edge-emitting InGaN/GaN disk-in-nanowire array laser on a silicon substrate.
  • To characterize the performance and reliability of these novel silicon-based lasers.

Main Methods:

  • Fabrication of InGaN/GaN disk-in-nanowire arrays on (001) silicon substrates.
  • Electrical pumping and continuous wave (CW) operation of the laser devices.
  • Characterization of device performance, including threshold current density, differential gain, T0, and modulation bandwidth.

Main Results:

  • Successful demonstration of an electrically pumped green laser (λ = 533 nm) on a silicon substrate.
  • Excellent DC and dynamic characteristics: threshold current density (1.76 kA/cm²), differential gain (3 × 10⁻¹⁷ cm²), T0 (232 K), and modulation bandwidth (5.8 GHz).
  • Preliminary reliability tests show a lifetime of 7000 hours; emission wavelength tunability achieved by varying alloy composition.

Conclusions:

  • Monolithic nanowire lasers on silicon are feasible and offer high performance.
  • The tunable wavelength and integration potential open doors for applications in solid-state lighting, displays, and silicon photonics.