Implementing non-reciprocal elements with a bandwidth comparable to optical frequencies is a challenge in integrated photonics. Now, a phonon pump has been used to achieve optical non-reciprocity over a large bandwidth.
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Seif, A., Hafezi, M. Broadband optomechanical non-reciprocity. Nature Photon 12, 60–61 (2018). https://doi.org/10.1038/s41566-018-0091-x
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DOI: https://doi.org/10.1038/s41566-018-0091-x
