Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session G52: Ultrafast Spectroscopy and Optical Techniques
11:30 AM–2:06 PM,
Tuesday, March 7, 2023
Room: Room 308
Sponsoring
Unit:
DLS
Chair: David Reis, Stanford PULSE Institute
Abstract: G52.00013 : Modeling of lasing threshold in GeSn waveguides on silicon*
1:54 PM–2:06 PM
Presenter:
Jay A Mathews
(Department of Physics, University of Dayton, Dayton, OH 45469)
Authors:
Jay A Mathews
(Department of Physics, University of Dayton, Dayton, OH 45469)
Zairui Li
(Department of Physics, Morehouse College, Atlanta, GA 30314)
Imad Agha
(Department of Physics, University of Dayton, Dayton, OH 45469)
In this work, we modeled the lasing threshold based on theoretical and empirical methods, and we explored its dependence on waveguide propagation loss, mirror reflection, Sn content, and recombination lifetime. The lasing threshold can be lowered through a variety of methods including material quality, device design, and fabrication techniques. Our results indicate that increasing the recombination lifetime through reduction of defects, which cause Shockley-Read-Hall nonradiative recombination, from 5 ns to 20 ns leads to a 70% reduction in the lasing threshold power. This indicates that room temperature lasing can be achieved through modest improvements in material quality. Further reductions in lasing threshold can be achieved through surface passivation and mirror design.
*This research was funded by an Air Force Office of Scientific Research (AFOSR) Young Investigator Award, Grant No. FA95501710146.
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