Three-dimensional imaging of ferroaxial domains using circularly polarized second harmonic generation microscopy
Three-dimensional imaging of ferroaxial domains using circularly polarized second harmonic generation microscopy
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DOI：
10.1038/s41535-022-00515-w
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发表时间：
2022-11
影响因子：
5.7
通讯作者：
H. Yokota;T. Hayashida;Dan Kitahara;T. Kimura
中科院分区：
文献类型：
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作者：
H. Yokota;T. Hayashida;Dan Kitahara;T. Kimura
物质的自发对称性破缺是材料物理学中最重要的概念之一，它导致了相转变为有序相并导致畴的形成。所谓的“铁轴有序”是指具有轴向矢量对称性的旋转结构畸变，作为一类新的有序态引起了人们越来越多的兴趣。然而，铁轴畴态，即顺时针和逆时针旋转态的观察并不简单，也很少被研究。在这里，我们建议，在二次谐波产生（CID-SHG）的圆形强度差提供了一个实验技术，通过高阶多极子，如磁偶极子和电四极子的过渡过程中，调查铁轴有序及其畴态。通过使用CID-SHG显微镜，我们成功地可视化三维图像的铁轴畴结构的NiTiO 3。我们的研究结果表明，CID-SHG是铁轴有序的灵敏探针，并打开了铁轴材料在非线性光学操作中使用的可能性。
The spontaneous symmetry breakdown of matter is one of the most important concepts in materials physics and leads to a phase transition into an ordered phase and domain formation in its consequence. The so-called ‘ferroaxial order’ characterized by a rotational structural distortion with an axial vector symmetry has gained growing interest as a new class of ordered state. However, the observation of ferroaxial domain states, that is, clockwise and counterclockwise rotational states, is not straightforward and has been little investigated. Here, we propose that the circular intensity difference in second harmonic generation (CID-SHG) offers an experimental technique to investigate ferroaxial order and its domain states through the transition process of higher-order multipoles such as magnetic-dipole and electric-quadrupole. By using CID-SHG microscopy, we successfully visualize three-dimensional images of ferroaxial domain structures in NiTiO3. Our results indicate that CID-SHG is a sensitive probe of ferroaxial order and opens possibilities for the use of ferroaxial materials in nonlinear optical manipulations.