Short-wave infrared cavity resonances in a single GeSn nanowire

Youngmin Kim, Simone Assali, Hyo-Jun Joo, Sebastian Koelling, Melvina Chen, Lu Luo, Xuncheng Shi, Daniel Burt, Zoran Ikonic, Donguk Nam () and Oussama Moutanabbir ()
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Youngmin Kim: Nanyang Technological University
Simone Assali: École Polytechnique de Montréal, C.P. 6079, Succ. Centre-Ville
Hyo-Jun Joo: Nanyang Technological University
Sebastian Koelling: École Polytechnique de Montréal, C.P. 6079, Succ. Centre-Ville
Melvina Chen: Nanyang Technological University
Lu Luo: École Polytechnique de Montréal, C.P. 6079, Succ. Centre-Ville
Xuncheng Shi: Nanyang Technological University
Daniel Burt: Nanyang Technological University
Zoran Ikonic: University of Leeds
Donguk Nam: Nanyang Technological University
Oussama Moutanabbir: École Polytechnique de Montréal, C.P. 6079, Succ. Centre-Ville

Nature Communications, 2023, vol. 14, issue 1, 1-7

Abstract: 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).

Date: 2023
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DOI: 10.1038/s41467-023-40140-0

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