Ultralow-threshold plasmonic lasers under continuous-wave pumping at room temperature have been created using lattice plasmonic cavities integrated with gain material consisting of upconverting nanoparticles.
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Ma, RM. Lasing under ultralow pumping. Nat. Mater. 18, 1152–1153 (2019). https://doi.org/10.1038/s41563-019-0513-2
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DOI: https://doi.org/10.1038/s41563-019-0513-2
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