Abstract
Semiconductor nanowire lasers are promising as ultrasmall, highly efficient coherent light emitters in the fields of nanophotonics, nano-optics and nanobiotechnology1,2. Although there have been several demonstrations of nanowire lasers using homogeneous bulk gain materials3,4,5,6,7,8,9,10,11,12,13,14 or multi-quantum-wells/disks15,16,17, it is crucial to incorporate lower-dimensional quantum nanostructures into the nanowire to achieve superior device performance in relation to threshold current, differential gain, modulation bandwidth and temperature sensitivity. The quantum dot is a useful and essential nanostructure that can meet these requirements18. However, difficulties in forming stacks of quantum dots in a single nanowire hamper the realization of lasing operation. Here, we demonstrate room-temperature lasing of a single nanowire containing 50 quantum dots by properly designing the nanowire cavity and tailoring the emission energy of each dot to enhance the optical gain. Our demonstration paves the way toward ultrasmall lasers with extremely low power consumption for integrated photonic systems.
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Acknowledgements
This work was supported by the Project for Developing Innovation Systems of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), the Japan Society for the Promotion of Science (JSPS) through its Funding Program for World-Leading Innovation R&D on Science and Technology (FIRST Program) and the New Energy and Industrial Technology Development Organization (NEDO). The authors thank M. Arita, M. Holmes, M. Nishioka and S. Ishida for discussions and technical support.
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J.T. and Y.A. conceived and designed the experiments. J.T. grew the NWQD samples. J.T., with support from J.H. and S.I., carried out the simulations and analyses. J.T., with assistance from Y.O., performed optical characterization of the NWQDs. J.T., with assistance from J.H. and S.K., carried out device characterization of the NWQD lasers. All authors contributed to interpretation of the data and preparation of the manuscript. J.T. and Y.A. wrote the paper. Y.A. supervised the entire project.
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Tatebayashi, J., Kako, S., Ho, J. et al. Room-temperature lasing in a single nanowire with quantum dots. Nature Photon 9, 501–505 (2015). https://doi.org/10.1038/nphoton.2015.111
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DOI: https://doi.org/10.1038/nphoton.2015.111
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