Abstract
The performance of many optical devices based on frequency conversion critically depends on spatial modulation of the nonlinear optical response of materials. This modulation ensures efficient energy exchange between optical waves at different frequencies via quasi-phase matching1. In general, quasi-phase-matching structures, also known as nonlinear photonic crystals2,3,4, offer a variety of properties and functionalities that cannot be obtained in uniform nonlinear crystals5,6,7,8,9. So far, nonlinear photonic crystals have been restricted to one- or two-dimensional geometries owing to a lack of fabrication technologies capable of three-dimensional (3D) nonlinearity engineering. Here, we provide an experimental example of a 3D nonlinear photonic crystal, fabricated in ferroelectric barium calcium titanate, by applying an ultrafast light domain inversion approach. The resulting full flexibility of 3D nonlinearity modulation enables phase matching of nonlinear processes along an arbitrary direction, thereby removing constraints imposed by low-dimensional structures.
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Acknowledgements
This work was supported by the Australian Research Council and Qatar National Research Fund (grant no. NPRP 8-246-1-060). T.X. acknowledges financial support from the China Scholarship Council in 2016 (no. 201606220151). We acknowledge support from the ANU Centre for Advanced Microscopy.
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Y.S. and W.K. conceived and coordinated the research project. All authors made significant contributions to the experiments, analysis of the data and writing of the manuscript.
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Additional information on ferroelectric barium calcium titanate and the quasi-phase-matched second-harmonic generation process.
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Xu, T., Switkowski, K., Chen, X. et al. Three-dimensional nonlinear photonic crystal in ferroelectric barium calcium titanate. Nature Photon 12, 591–595 (2018). https://doi.org/10.1038/s41566-018-0225-1
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DOI: https://doi.org/10.1038/s41566-018-0225-1
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