Study of Si-Based GeSn Optically Pumped Lasers With Micro-Disk and Ridge Waveguide Structures
oleh: 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
| Format: | Article |
|---|---|
| Diterbitkan: | Frontiers Media S.A. 2019-10-01 |
Deskripsi
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.