Far-field photons can be coupled to acoustic graphene plasmons with near 100% efficiency and used to acquire infrared spectra of thin, subnanometre-layer samples.
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Autore, M., Hillenbrand, R. What momentum mismatch?. Nat. Nanotechnol. 14, 308–309 (2019). https://doi.org/10.1038/s41565-019-0390-5
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DOI: https://doi.org/10.1038/s41565-019-0390-5
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