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Title: Theoretical design of mid-infrared interband cascade lasers in SiGeSn system
Authors: Li, Yuan
Song, Zhigang
Li, Zeyu
Sun, Greg
Tan, Chuan Seng
Fan, Weijun
Wang, Qi Jie
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2020
Source: Li, Y., Song, Z., Li, Z., Sun, G., Tan, C. S., Fan, W., & Wang, Q. J. (2020). Theoretical design of mid-infrared interband cascade lasers in SiGeSn system. New Journal of Physics, 22. doi:10.1088/1367-2630/ab9c67
Project: NRF-CRP19-2017-01
Journal: New Journal of Physics
Abstract: By carefully analyzing the latest composition-dependent parameters of SiGeSn alloys, we come to realize that this system could provide type-II energy band alignment at direct bandgap condition. The discovery inspires us to explore the mid-infrared interband cascade laser (ICL) in SiGeSn system. Based on the eight-band k ⋅ p model, we theoretically design three schemes of ICL, in which the active region and the carrier injectors are optimized simultaneously. Afterward, the properties of TE-mode optical gain spectrums and differential gain are investigated individually for each scheme. Furthermore, the spontaneous emission spectrums and radiative current density are also calculated. Our theoretical results indicate that the active region composed of double-electron and triple-hole quantum wells has the best gain performance, reaching 660 cm−1 for a single period of the ICL under 7.8 × 1018 cm−3 injected electron density. This work opens up another type of infrared lasers that can be developed from the group-IV system, offering a new pathway to achieving the monolithic integration in Si photonics.
ISSN: 1367-2630
DOI: 10.1088/1367-2630/ab9c67
Rights: © 2020 The Author(s). Published by IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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