The strongly temperature-dependent band-edge absorption from gallium arsenide enables an optical thermometer with nanokelvin temperature resolution and microscale spatial resolution.
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Gupta, C., Pauzauskie, P.J. Semiconductor yields sensitive thermometry. Nat. Photon. 16, 407–408 (2022). https://doi.org/10.1038/s41566-022-01012-z
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DOI: https://doi.org/10.1038/s41566-022-01012-z