Journal
NANO LETTERS
Volume 17, Issue 3, Pages 1775-1781Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b05097
Keywords
Nanowire lasers; dilute nitride; GaAs/GaAsN; core/shell structure
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Funding
- Swedish Energy Agency [P40119-1]
- Swedish Research Council [2015-05532]
- Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University [2009 00971]
- KAKENHI from the Japan Society for the Promotion of Science [16H05970, 23686004]
- Kato Foundation for Promotion of Science
- Kurata Memorial Hitachi Science and Technology Foundation
- Murata Science Foundation
- Swedish Research Council [2015-05532] Funding Source: Swedish Research Council
- Grants-in-Aid for Scientific Research [23686004, 16H05970] Funding Source: KAKEN
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Nanowire (NW) lasers operating in the near infrared spectral range are of significant technological importance for applications in telecommunications, sensing, and medical diagnostics. So far, lasing within this spectral range has been achieved using GaAs/AlGaAs, GaAs/GaAsP, and InGaAs/GaAs core/shell NWs. Another promising III-V material, not yet explored in its lasing capacity, is the dilute nitride GaNAs. In this work, we demonstrate, for the first time, optically pumped lasing from the GaNAs shell of a single GaAs/GaNAs core/shell NW. The characteristic S-shaped pump power dependence of the lasing intensity, with the concomitant line width narrowing, is observed, which yields a threshold gain, g(th), of 3300 cm(-1) and a spontaneous emission coupling factor beta, of 0.045. The dominant lasing peak is identified to arise from the HE21b, cavity mode, as determined from its pronounced emission polarization along the NW axis combined with theoretical calculations of lasing threshold for guided modes inside the nanowire. Even without intentional pas sivation of the NW surface, the lasing emission can be sustained up to 150 K. This is facilitated by the improved surface quality due to nitrogen incorporation, which partly suppresses the surface-related nonradiative recombination centers via nitridation. Our work therefore represents the first step toward development of room-temperature infrared NW lasers based on dilute nitrides with extended tunability in the lasing wavelength.
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