Evanescent photons of a hot body at a temperature below 500 K can be efficiently converted into electricity in a near-field thermophotovoltaic device.
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Ben-Abdallah, P. Energy harvesting from lukewarm photons. Nature Nanotech 13, 772–773 (2018). https://doi.org/10.1038/s41565-018-0180-5
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DOI: https://doi.org/10.1038/s41565-018-0180-5
