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Doping-enhanced radiative efficiency enables lasing in unpassivated GaAs nanowires

Burgess, Tim, Saxena, Dhruv, Mokkapati, Sudha, Li, Zhe, Hall, Christopher R., Davis, Jeffrey A., Wang, Yuda, Smith, Leigh M., Fu, Lan, Caroff, Philippe, Tan, Hark Hoe and Jagadish, Chennupati 2016. Doping-enhanced radiative efficiency enables lasing in unpassivated GaAs nanowires. Nature Communications 7 , 11927. 10.1038/ncomms11927

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Nanolasers hold promise for applications including integrated photonics, on-chip optical interconnects and optical sensing. Key to the realization of current cavity designs is the use of nanomaterials combining high gain with high radiative efficiency. Until now, efforts to enhance the performance of semiconductor nanomaterials have focused on reducing the rate of non-radiative recombination through improvements to material quality and complex passivation schemes. Here we employ controlled impurity doping to increase the rate of radiative recombination. This unique approach enables us to improve the radiative efficiency of unpassivated GaAs nanowires by a factor of several hundred times while also increasing differential gain and reducing the transparency carrier density. In this way, we demonstrate lasing from a nanomaterial that combines high radiative efficiency with a picosecond carrier lifetime ready for high speed applications.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Additional Information: This work is licensed under a Creative Commons Attribution 4.0 International License.
Publisher: Nature Research
ISSN: 2041-1723
Date of First Compliant Deposit: 25 May 2017
Date of Acceptance: 12 May 2016
Last Modified: 29 Apr 2020 17:15

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