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. 2020 Mar 17;9:43. doi: 10.1038/s41377-020-0279-y

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© The Author(s) 2020

Open Access 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — Characterisation of a typical NW laser. a Power-dependent emission spectra on a log scale, showing PL clamping at the onset of lasing, followed by narrow single-mode emission. b The light intensity-in vs. intensity-out plot corresponding to the same wire/data in a on a log–log scale (with the output measured within a narrow spectral range of λ_Las) and fit with the indicated threshold position (L_th). Data points are colour matched to the corresponding spectra in a, and the grey data points indicate additional powers not included in a. The two insets show emission images of the same NW, taken (left) just below and (right) above threshold, showing the emergence of spatially coherent emission from the end facets. c A histogram of the lasing thresholds for all 270 wires, with the example NL in a, b indicated by a vertical red dashed line. The inset shows an SEM image of the NWs after MBE growth, with the scale bar representing 5 μm in length. d TEM image of the NW cross-section (right) and schematic illustrating the structure (left)