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Strong spin–orbit interaction of photonic skyrmions at the general optical interface
Nanophotonics ( IF 7.5 ) Pub Date : 2020-09-17 , DOI: 10.1515/nanoph-2020-0430
Peng Shi 1 , Luping Du 1 , Xiaocong Yuan 1
Affiliation  

Abstract Photonic skyrmions have applications in many areas, including the vectorial and chiral optics, optical manipulation, deep-subwavelength imaging and nanometrology. Much effort has been focused on the experimental characterization of photonic skyrmions. Here, we give an insight into the spin and orbital features of photonic skyrmions constructed by the p-polarized and s-polarized surface waves at an interface with various electric and magnetic properties by analyzing the continuity of chirality, energy flow and momentum densities through the electric and magnetic interface. The continuity of chirality density indicates that the photonic skyrmion has a property of the optical transverse spin. Most importantly, the continuity of energy flow and momentum densities results in four spin–orbit interaction quantities, which indicate the gradient of electric polarizability or permeability governs the spin–orbit interaction of photonic skyrmions and leads to the discontinuity and even the reversal of spin orientation through the optical interface. Our investigations on the spin–orbit properties of photonic skyrmions, which can give rise to the spin-dependent force and topological unidirectional transportation, is thorough and can be extended to other classical wave, such as acoustic and fluid waves. The findings help in understanding the spin–orbit feature of photonic topological texture and in constructing further optical manipulation, sensing, quantum and topological techniques.

中文翻译:

光子斯格明子在一般光学界面的强自旋轨道相互作用

摘要 光子斯格明子在许多领域都有应用,包括矢量和手性光学、光学操纵、深亚波长成像和纳米计量学。许多努力都集中在光子斯格明子的实验表征上。在这里,我们通过分析手性、能量流和动量密度的连续性,深入了解由 p 极化和 s 极化表面波在具有各种电和磁特性的界面处构建的光子斯格明子的自旋和轨道特征。电和磁接口。手性密度的连续性表明光子斯格明子具有光学横向自旋的特性。最重要的是,能量流和动量密度的连续性导致四个自旋轨道相互作用量,这表明极化率或渗透率的梯度控制着光子斯格明子的自旋轨道相互作用,并导致通过光学界面的自旋方向的不连续性甚至反转。我们对光子斯格明子的自旋轨道特性的研究是彻底的,可以扩展到其他经典波,例如声波和流体波,它可以产生与自旋相关的力和拓扑单向传输。这些发现有助于理解光子拓扑结构的自旋轨道特征,并有助于构建进一步的光学操纵、传感、量子和拓扑技术。
更新日期:2020-09-17
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