Going beyond the conventional approach based on the Faraday effect, scientists have now used acoustic modes optically excited in the core of a photonic crystal fibre to realize a reconfigurable all-optical isolator.
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Yu, Z., Fan, S. A non-magnetic approach. Nature Photon 5, 517–519 (2011). https://doi.org/10.1038/nphoton.2011.216
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DOI: https://doi.org/10.1038/nphoton.2011.216
