Frontiers in Physics (Oct 2019)

Study of Si-Based GeSn Optically Pumped Lasers With Micro-Disk and Ridge Waveguide Structures

  • Wei Du,
  • Quang M. Thai,
  • Jeremie Chrétien,
  • Mathieu Bertrand,
  • Lara Casiez,
  • Yiyin Zhou,
  • Joe Margetis,
  • Nicolas Pauc,
  • Alexei Chelnokov,
  • Vincent Reboud,
  • Vincent Calvo,
  • John Tolle,
  • Baohua Li,
  • Shui-Qing Yu

DOI
https://doi.org/10.3389/fphy.2019.00147
Journal volume & issue
Vol. 7

Abstract

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A silicon-based monolithic laser has long been desired. Recent demonstration of lasing from direct bandgap group-IV alloy GeSn has opened up a completely new approach that is different from the traditional III-V integration on Si. In this study, high-quality GeSn samples were grown using a unique spontaneous Sn-enhanced growth recipe with an Sn composition as high as ~20.0%. GeSn lasers based on waveguide Fabry-Pérot and micro-disk cavities were fabricated and characterized. The waveguide features better local heat dissipation, while the micro-disk offers stronger optical confinement plus strain relaxation. The maximum operating temperature of 260 K was achieved from a waveguide laser, and a threshold of 108 kW/cm2 at 15 K was achieved from a micro-disk laser. A peak lasing wavelength of up to 3.5 μm was obtained with a 100-μm-wide ridge waveguide laser.

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