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Tuning Lasing Emission toward Long Wavelengths in GaAs-(In,Al)GaAs Core-Multishell Nanowires.

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Summary
This summary is machine-generated.

Researchers developed tunable semiconductor nanowire (NW) lasers using core-shell structures with multiple InGaAs quantum wells (QWs). These NW lasers emit light from the near-infrared to telecommunications wavelengths, crucial for optical communication and sensing applications.

Keywords:
InGaAsNanowire lasersmolecular beam epitaxymonolithic III/V integration on Siphotoluminescencequantum wellsscanning transmission electron microscopy

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Semiconductor nanowire (NW) lasers are promising for on-chip optical communication and sensing.
  • Tuning emission across near-infrared to telecommunications wavelengths from NWs is challenging.
  • Requires low-dimensional gain regions with adjustable band gaps and quantum confinement.

Purpose of the Study:

  • Demonstrate tunable lasing from GaAs-(InGaAs/AlGaAs) core-shell NWs.
  • Investigate the interplay between quantum well (QW) design, growth kinetics, and InGaAs composition for wavelength tuning.
  • Provide guidelines for III-V NW laser development.

Main Methods:

  • Fabrication of GaAs-(InGaAs/AlGaAs) core-shell NWs with multiple InGaAs QWs.
  • Optical pumping for lasing characterization.
  • Scanning transmission electron microscopy (STEM), atom probe tomography (APT), and confocal photoluminescence (PL) spectroscopy for material analysis.

Main Results:

  • Achieved tunable lasing from approximately 0.8 to 1.1 μm.
  • Demonstrated high In molar fractions (up to ~25%) without strain relaxation or alloy intermixing using low shell growth temperature and GaAs interlayers.
  • Correlated microscopic properties with optically pumped lasing characteristics.

Conclusions:

  • Successful demonstration of tunable lasing in core-shell NWs with multiple QWs.
  • Identified critical factors for controlling InGaAs composition and achieving wavelength tunability.
  • Provided insights into the structure-property relationships for III-V NW lasers.