By making use of the spin angular momentum of light, rotational frequency shifts of harmonic waves generated by spinning nonlinear media have been observed.
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Brasselet, E. Harmonic angular Doppler effect. Nature Photon 10, 362–364 (2016). https://doi.org/10.1038/nphoton.2016.106
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DOI: https://doi.org/10.1038/nphoton.2016.106
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