An acoustic wave can induce non-reciprocal light modulation in a silicon waveguide. Now, the acoustic wave has been induced optically in a neighbouring silicon waveguide, opening the way for a silicon-based optical isolator.
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Petrov, A.Y. Non-reciprocal modulation via acousto-optics. Nature Photon 12, 570–571 (2018). https://doi.org/10.1038/s41566-018-0264-7
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DOI: https://doi.org/10.1038/s41566-018-0264-7
