ORCID Profile
0000-0002-4932-1329
Current Organisation
Shandong University
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Publisher: Springer Science and Business Media LLC
Date: 24-11-2020
DOI: 10.1038/S41377-020-00427-Z
Abstract: 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 °C. 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.
Publisher: American Chemical Society (ACS)
Date: 08-03-2018
DOI: 10.1021/JACS.8B01263
Abstract: Two novel noncentrosymmetric alkaline earth fluorooxoborates, M
Publisher: Wiley
Date: 24-01-2022
Abstract: It has always been a hot topic to design an orderly mesoscopic structure in functional materials to tailor the macroscopic properties or realize new functions. The existence of domains in ferroelectric materials has been proven to affect the macroscopic properties, being actively studied in nonlinear optical conversion and piezoelectric effects. However, the high‐efficiency photoelectric conversion capability of ferroelectric crystals has not yet been explored. Here, the authors study the orderly arrangement of ferroelectric order in KTa 1− x Nb x O 3 (KTN) perovskite crystals, and design the “head‐to‐head” domains by tuning the Curie temperature T c , thereby generating abundant charged domain walls and robust conductive channels for electrons and holes. An ultrahigh ultraviolet photoresponsivity is achieved in the KTN crystal under zero bias voltage, being about four orders magnitude higher than that of the well‐known ferroelectric materials. The substantial improvement can be attributed to the judiciously designed ferroelectric order, as demonstrated by the conductive atomic force microscopy. In addition, KTN detector exhibits high stability and reliability after high‐temperature and fatigue treatment. KTN crystal features giant photoresponsivity, high electric–optical coefficient, and large χ (2) nonlinearity concurrently, indicating its great potential for application of all‐optical devices on photonic chips.
No related grants have been discovered for Fei Liang.