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Quantum dot selective area intermixing for broadband light sources.

K J Zhou1, Q Jiang, Z Y Zhang

  • 1Department of Electronic and Electrical Engineering, University of Sheffield, Centre for Nano-Science and Technology, Broad Lane, Sheffield, UK. k.zhou@shef.ac.uk

Optics Express
|November 29, 2012
PubMed
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Different capping materials significantly alter quantum dot optical properties during annealing. Selective area intermixing enables multi-section quantum dot devices with enhanced spectral bandwidth and improved axial resolution for optical coherence tomography.

Area of Science:

  • Semiconductor Physics
  • Materials Science
  • Optoelectronics

Background:

  • Quantum dots (QDs) are crucial for optoelectronic devices.
  • Controlling QD properties through capping materials is essential for device performance.
  • Selective area intermixing offers a pathway for integrating multiple QD functionalities.

Purpose of the Study:

  • To compare the effects of various capping materials on InAs/In(Ga)As quantum dot intermixing.
  • To demonstrate the lateral integration of multiple quantum dot light-emitting devices using selective area intermixing.
  • To assess the spectral bandwidth and axial resolution achievable with multi-section QD devices.

Main Methods:

  • Investigated the influence of different capping materials on quantum dot optical properties during annealing.

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  • Employed selective area intermixing to fabricate laterally integrated multi-section quantum dot devices.
  • Calculated spectral bandwidth, point spread function, and applied Rayleigh criteria to determine axial resolution.

    • Main Results:

    • Significant differences in optical properties were observed based on capping materials during annealing.
    • Achieved a spectral bandwidth of 240nm centered at 1188nm in a two-section device.
    • A three-section device yielded a spectral bandwidth of 310nm centered at 1145nm.
    • Deduced axial resolutions of 3.5μm and 2.4μm for two- and three-section devices, respectively.

    Conclusions:

    • Capping material choice critically impacts quantum dot intermixing and optical properties.
    • Selective area intermixing is a viable technique for creating advanced, multi-functional quantum dot devices.
    • The demonstrated axial resolutions are highly promising for applications in optical coherence tomography and other coherence-based systems.