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Enhanced Photon Extraction through Optimized Waveguide Geometry for Zincblende InAsP/InP Nanowire Quantum Dots

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We demonstrate efficient InP waveguides around InAsP quantum dots (QDs) in nanowires (NWs) without complex fabrication. This method enhances QD emission intensity for telecom applications.

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Area of Science:

  • Semiconductor Nanostructures
  • Optoelectronics
  • Materials Science

Background:

  • InAsP quantum dots (QDs) in InP nanowires (NWs) offer controlled growth via Au-catalyzed vapor-liquid-solid (VLS) methods.
  • Integrating QDs with waveguides is crucial for optoelectronic devices, but typically requires complex fabrication like selective-area epitaxy (SAE-VLS).

Purpose of the Study:

  • To develop a simplified method for fabricating InP waveguides around InAsP QDs in NWs.
  • To investigate the relationship between growth parameters, NW-QD geometry, and waveguide morphology.
  • To enhance the emission properties of InAsP QDs within integrated waveguides.

Main Methods:

  • Utilizing Au-catalyzed VLS growth along the <100> direction for InAsP NW-QDs.
  • Balancing axial and radial growth to form InP waveguides without SAE-VLS.
  • Employing finite-difference time-domain (FDTD) simulations for geometric optimization.
  • Conducting microphotoluminescence (µPL) measurements to assess emission properties.

Main Results:

  • Achieved efficient InP waveguide formation around InAsP QDs without prepatterning.
  • Identified optimal NW-QD geometries through FDTD simulations.
  • Observed enhanced QD emission intensity (one order of magnitude) in the telecom range.
  • Demonstrated improved emission properties of the optimized structures.

Conclusions:

  • Simplified fabrication of integrated NW-QD-waveguide structures is achievable by controlling growth parameters.
  • Optimized geometries significantly enhance QD emission intensity, paving the way for efficient telecom-based optoelectronic devices.
  • This approach offers a promising route for scalable production of high-performance nanophotonic devices.