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

Alanis, Juan Arturo, Saxena, Dhruv, Mokkapati, Sudha ORCID: https://orcid.org/0000-0003-3260-6560, 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:	01 Dec 2024 22:15
URI:	https://orca.cardiff.ac.uk/id/eprint/102860

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