Providing sufficient gain to overcome loss remains a fundamental challenge for light amplification in miniaturized plasmonic devices. Ongoing research gives hope for a cautious but optimistic outlook.
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Oulton, R. Loss and gain. Nature Photon 6, 219–221 (2012). https://doi.org/10.1038/nphoton.2012.72
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DOI: https://doi.org/10.1038/nphoton.2012.72
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