Chen, M. orcid.org/0009-0003-3201-9603, Joo, H.-J. orcid.org/0000-0002-4923-9771, Kim, Y. orcid.org/0000-0001-7248-2078 et al. (6 more authors) (2024) Tensile-Strained GeSn Microbridge Lasers with Lithographically Controllable Emission Wavelengths. ACS Photonics. ISSN 2330-4022
Abstract
GeSn alloys are considered a promising solution to long-sought on-chip industry-compatible light sources. Relentless efforts to improve the performance of GeSn lasers include utilizing tensile strain engineering. However, inducing tensile strain in GeSn has been challenging due to residual compressive strain in the GeSn layer, necessitating complex fabrication processes such as multiple deposition of external stressors. Here, we demonstrate tensile-strained GeSn microbridge lasers by harnessing a geometric strain-inversion technique enabled by a single lithography step. Multiple lasers producing different emission wavelengths were fabricated on a single chip by lithographically controlling the tensile strain. Upon the application of tensile strain, the emission wavelength was tuned by more than 45 nm, while the laser threshold was reduced by almost 70%. This work presents a simple, cost-effective way to build a large array of on-chip lasers emitting different colors. This method holds potential for applications such as wavelength division multiplexing with on-chip lasers.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | This is an author produced version of an article accepted for publication in ACS Photonics, made available under the terms of the Creative Commons Attribution License (CC-BY), which permits unrestricted use, distribution and reproduction in any medium, provided the original work is properly cited. |
Keywords: | germanium tin; microlasers; group-IV lasers; strain engineering; tunability; silicon photonics |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Electronic & Electrical Engineering (Leeds) > Pollard Institute (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 08 Nov 2024 12:27 |
Last Modified: | 08 Nov 2024 12:27 |
Status: | Published online |
Publisher: | American Chemical Society |
Identification Number: | 10.1021/acsphotonics.4c01173 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:219358 |