Heterostructure and Q-factor engineering for low-threshold and persistent nanowire lasing
Open Access
- 17 March 2020
- journal article
- research article
- Published by Springer Science and Business Media LLC in Light: Science & Applications
- Vol. 9 (1), 1-10
- https://doi.org/10.1038/s41377-020-0279-y
Abstract
Continuous room temperature nanowire lasing from silicon-integrated optoelectronic elements requires careful optimisation of both the lasing cavity Q-factor and population inversion conditions. We apply time-gated optical interferometry to the lasing emission from high-quality GaAsP/GaAs quantum well nanowire laser structures, revealing high Q-factors of 1250 ± 90 corresponding to end-facet reflectivities of R = 0.73 ± 0.02. By using optimised direct–indirect band alignment in the active region, we demonstrate a well-refilling mechanism providing a quasi-four-level system leading to multi-nanosecond lasing and record low room temperature lasing thresholds (~6 μJ cm−2 pulse−1) for III–V nanowire lasers. Our findings demonstrate a highly promising new route towards continuously operating silicon-integrated nanolaser elements.Keywords
Funding Information
- Royal Society (PI150018)
- RCUK | Engineering and Physical Sciences Research Council (EP/P006973/1, National Epitaxy Facility, EP/P000886/1, EP/P000916/1, EP/P000916/1)
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