The first three-dimensional nonlinear photonic crystals have been constructed thanks to the use of femtosecond laser writing in quadratic nonlinear materials.
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Keren-Zur, S., Ellenbogen, T. A new dimension for nonlinear photonic crystals. Nature Photon 12, 575–577 (2018). https://doi.org/10.1038/s41566-018-0262-9
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DOI: https://doi.org/10.1038/s41566-018-0262-9
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