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Title: Short-wave infrared cavity resonances in a single GeSn nanowire
Authors: Kim, Youngmin
Assali, Simone
Joo, Hyo-Jun
Koelling, Sebastian
Chen, Melvina
Luo, Lu
Shi, Xuncheng
Burt, Daniel
Ikonic, Zoran
Nam, Donguk
Moutanabbir, Oussama
Keywords: Engineering::Electrical and electronic engineering::Optics, optoelectronics, photonics
Issue Date: 2023
Source: Kim, Y., Assali, S., Joo, H., Koelling, S., Chen, M., Luo, L., Shi, X., Burt, D., Ikonic, Z., Nam, D. & Moutanabbir, O. (2023). Short-wave infrared cavity resonances in a single GeSn nanowire. Nature Communications, 14(1), 4393-1-4393-7.
Project: 101070700 (MIRAQLS) 
RG 115/21 
MOE2018-T2-2-011 (S) 
Journal: Nature Communications 
Abstract: Nanowires are promising platforms for realizing ultra-compact light sources for photonic integrated circuits. In contrast to impressive progress on light confinement and stimulated emission in III-V and II-VI semiconductor nanowires, there has been no experimental demonstration showing the potential to achieve strong cavity effects in a bottom-up grown single group-IV nanowire, which is a prerequisite for realizing silicon-compatible infrared nanolasers. Herein, we address this limitation and present an experimental observation of cavity-enhanced strong photoluminescence from a single Ge/GeSn core/shell nanowire. A sufficiently large Sn content (~ 10 at%) in the GeSn shell leads to a direct bandgap gain medium, allowing a strong reduction in material loss upon optical pumping. Efficient optical confinement in a single nanowire enables many round trips of emitted photons between two facets of a nanowire, achieving a narrow width of 3.3 nm. Our demonstration opens new possibilities for ultrasmall on-chip light sources towards realizing photonic-integrated circuits in the underexplored range of short-wave infrared (SWIR).
ISSN: 2041-1723
DOI: 10.1038/s41467-023-40140-0
Schools: School of Electrical and Electronic Engineering 
Rights: © 2023 The Author(s). This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit
Fulltext Permission: open
Fulltext Availability: With Fulltext
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