Switching the handedness of circularly polarized light requires separately controlling the phases of orthogonal components while maintaining their magnitudes, ideally with gigahertz operation rates. Ultrafast switching has now been realized via all-optical control of birefringent metamaterials.
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Liu, Q., Liu, M. Circular-polarization modulator. Nature Photon 11, 614–616 (2017). https://doi.org/10.1038/s41566-017-0015-1
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DOI: https://doi.org/10.1038/s41566-017-0015-1
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