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arXiv 1807.01036physics.optics
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二维随机矢量波中同电荷极化奇点的空间聚束

Spatial bunching of same-charge polarization singularities in two-dimensional random vector waves

L. De Angelis, F. Alpeggiani, L. Kuipers

摘要:

拓扑奇点在物理学的许多领域都是普遍存在的。偏振奇点是光的偏振椭圆的一个方面变得不确定或退化的位置。在C点处,椭圆的方向变得退化,并且光的电场矢量在时间上描述了一个完美的圆。在3D随机场的2D切片中,C点在空间中的分布使人想起相互作用粒子的分布。通过近场实验,我们发现,当光变成真正的2D时,这对空间中C点的分布有严重的影响。最显著的变化是,在一个消失的距离找到两个C点具有相同的拓扑电荷的概率提高了在一个2D领域。这是一个不寻常的发现,任何系统,表现出拓扑奇异性的同电荷排斥通常观察。我们所有的实验结果都得到了理论的支持,理论和实验之间有很好的一致性。

英文摘要:

Topological singularities are ubiquitous in many areas of physics. Polarization singularities are locations at which an aspect of the polarization ellipse of light becomes undetermined or degenerate. At C points the orientation of the ellipse becomes degenerate and light's electric field vector describes a perfect circle in time. In 2D slices of 3D random fields the distribution in space of the C points is reminiscent of that of interacting particles. With near-field experiments we show that when light becomes truly 2D, this has severe consequences for the distribution of C points in space. The most notable change is that the probability of finding two C points with the same topological charge at a vanishing distance is enhanced in a 2D field. This is an unusual finding for any system which exhibits topological singularities as same-charge repulsion is typically observed. All our experimental findings are supported with theory and excellent agreement is found between theory and experiment.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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