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Large-scale statistics for threshold optimization of optically pumped nanowire lasers

Alanis, Juan Arturo, Saxena, Dhruv, Mokkapati, Sudha, Jiang, Nian, Peng, Kun, Tang, Xiaoyan, Fu, Lan, Tan, Hark Hoe, Jagadish, Chennupati and Parkinson, Patrick 2017. Large-scale statistics for threshold optimization of optically pumped nanowire lasers. Nano Letters 17 (8) , pp. 4960-4865. 10.1021/acs.nanolett.7b01725

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Abstract

Single nanowire lasers based on bottom-up III-V materials have been shown to exhibit room-temperature near-infrared lasing, making them highly promising for use as nanoscale, silicon-integrable and coherent light sources. While lasing behavior is reproducible, small variations in growth conditions across a substrate arising from the use of bottom-up growth techniques can introduce inter-wire disorder, either through geometric or material inhomogeneity. Nanolasers critically depend on both high material quality and tight dimensional tolerances, and as such, lasing threshold is both sensitive to, and a sensitive probe of such inhomogeneity. We present an all-optical characterization technique coupled to statistical analysis to correlate geometrical, and material parameters with lasing threshold. For these multiple-quantum-well nanolasers, it is found that low threshold is closely linked to longer lasing wavelength caused by losses in the core, providing a route to optimized future low-threshold devices. A best-in-group room temperature lasing threshold of 43 uJcm-2 under pulsed excitation was found, and overall device yields in excess of 50% are measured, demonstrating a promising future for the nanolaser architecture.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Publisher: American Chemical Society
ISSN: 1530-6984
Date of First Compliant Deposit: 24 July 2017
Date of Acceptance: 21 July 2017
Last Modified: 21 Jul 2018 03:16
URI: http://orca-mwe.cf.ac.uk/id/eprint/102860

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