
1.State Key Laboratory of Crystal Materials and Institute of Crystal Materials, Shandong University, Jinan 250100, China
2.Advanced Materials Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China
3.Key Laboratory of Optoelectronic Material and Device, Department of Physics, Shanghai Normal University, Shanghai 200234, China
Fei Liang (liangfei@sdu.edu.cn)
Haohai Yu (haohaiyu@sdu.edu.cn)
Published:2020,
Published Online:24 November 2020,
Received:10 July 2020,
Revised:28 October 2020,
Accepted:04 November 2020
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Li, C. et al. Three-dimensional nonlinear photonic crystal in naturally grown potassium–tantalate–niobate perovskite ferroelectrics. Light: Science & Applications, 9, 1966-1973 (2020).
Li, C. et al. Three-dimensional nonlinear photonic crystal in naturally grown potassium–tantalate–niobate perovskite ferroelectrics. Light: Science & Applications, 9, 1966-1973 (2020). DOI: 10.1038/s41377-020-00427-z.
Since quasi-phase-matching of nonlinear optics was proposed in 1962
nonlinear photonic crystals were rapidly developed by ferroelectric domain inversion induced by electric or light poling. The three-dimensional (3D) periodical rotation of ferroelectric domains may add feasible modulation to the nonlinear coefficients and break the rigid requirements for the incident light and polarization direction in traditional quasi-phase-matching media. However
3D rotating ferroelectric domains are difficult to fabricate by the direct external poling technique. Here
we show a natural potassium–tantalate–niobate (KTN) perovskite nonlinear photonic crystal with spontaneous Rubik's cube-like domain structures near the Curie temperature of 40 ℃. The KTN crystal contains 3D ferroelectric polarization distributions corresponding to the reconfigured second-order susceptibilities
which can provide rich reciprocal vectors to compensate for the phase mismatch along an arbitrary direction and polarization of incident light. Bragg diffraction and broadband second-harmonic generation are also presented. This natural nonlinear photonic crystal directly meets the 3D quasi-phase-matching condition without external poling and establishes a promising platform for all-optical nonlinear beam shaping and enables new optoelectronic applications for perovskite ferroelectrics.
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