论文标题
在声波中观察两极分化奇异性和拓扑纹理
Observation of polarization singularities and topological textures in sound waves
论文作者
论文摘要
极化奇异性和拓扑极化结构是任何性质不均匀矢量波场的通用特征。但是，他们的实验研究主要仅限于光波。在这里，我们报告了对不均匀声波的3D极化场中极化奇异性，拓扑莫比乌斯 - 串结构和高敏纹理的观察。我们的实验是在超声域中使用由太空变化2D声源产生的非选项域传播场进行的。我们还检索了这些磁场中3D旋转密度的分布。我们的结果为拓扑特征和结构性声波的非平凡3D矢量特性的研究和应用开辟了道路。
Polarization singularities and topological polarization structures are generic features of inhomogeneous vector wave fields of any nature. However, their experimental studies mostly remain restricted to optical waves. Here we report observation of polarization singularities, topological Mobius-strip structures and skyrmionic textures in 3D polarization fields of inhomogeneous sound waves. Our experiments are made in the ultrasonic domain using nonparaxial propagating fields generated by space-variant 2D acoustic sources. We also retrieve distributions of the 3D spin density in these fields. Our results open the avenue to investigations and applications of topological features and nontrivial 3D vector properties of structured sound waves.
