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Submonolayer quantum dots for high speed surface emitting lasers.

Nn Ledentsov1, D Bimberg, F Hopfer

  • 1VI System GmbH, Berlin, Germany. leden@sol.physik.tu-berlin.de.

Nanoscale Research Letters
|July 29, 2011
PubMed
Summary

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Submonolayer quantum dots (SML QDs) enable high-density arrays for advanced lasers. These SML QDs achieve robust, high-speed performance in vertical-cavity surface-emitting lasers (VCSELs) up to 100°C.

Area of Science:

  • Semiconductor physics
  • Optoelectronics
  • Materials science

Background:

  • Submonolayer (SML) quantum dots (QDs) offer unique properties for optoelectronic devices.
  • Vertical-cavity surface-emitting lasers (VCSELs) are key components in high-speed optical communication.

Purpose of the Study:

  • To investigate the growth and application of SML QDs in high-speed VCSELs.
  • To enhance laser performance through controlled QD arrangement and stacking.
  • To achieve temperature-robust and high-data-rate operation.

Main Methods:

  • Controlled SML deposition for high-density QD array formation.
  • Vertical stacking of SML QDs with ultrathin spacer layers.
  • Engineering QD strain and wavefunction via island arrangement.

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  • Characterization of optical properties and device performance.

    • Main Results:

    • Achieved high density QD arrays with uniform size and shape.
    • Demonstrated ultrahigh modal gain and reduced temperature effects.
    • Realized temperature robustness up to 100°C for 0.98 μm VCSELs.
    • Attained 20 Gb/s open eye operation (BER < 10-12) from 25-85°C.
    • Observed relaxation oscillations up to ~30 GHz.

    Conclusions:

    • SML QDs are highly effective for advanced VCSEL active media.
    • Vertical stacking and arrangement engineering enable significant performance improvements.
    • SML QD-based VCSELs show promise for future high-speed, temperature-stable optical communication.