电点偶极子诱导自由空间电磁波内能流的近场行为

3区 物理与天体物理 Q1 Materials Science
Hyoung-In Lee
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引用次数: 1

摘要

轨道和自旋能通量都构成了由坡印廷矢量分解的内部流。对于通过无源介质传播的一般电磁波,这些能量通量在场变量中是二次的,因此它们的性质不容易预测。然而,它们的近场行为在纳米光子学中起着重要的作用。对于时间振荡场,我们在两个内部流之间发现了两个迄今为止被忽视的区别。第一个是它们之间的不平等,因为轨道能量通量的涡度与自旋能量通量本身起着相当的作用。第二是关于处理两种内部流的电磁双对称,其中反应螺旋度与电磁螺旋度起着同样重要的作用。根据螺旋守恒,自旋角动量密度可能存在电-磁间输运,而轨道能量通量的电和磁成分只承认各自的电内输运和磁内输运。我们以电偶极子点(线性或圆形)产生的电磁场为例,检验了所有这些说法的有效性。因此,我们不仅在推导内能流的显式形式,而且在揭示隐藏在电点偶极子诱导的电磁波下的磁活动方面作出了新的贡献。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Near-Field Behaviors of Internal Energy Flows of Free-Space Electromagnetic Waves Induced by Electric Point Dipoles
Both orbital and spin energy fluxes constitute the internal flows decomposed from a Poynting vector. For generic electromagnetic waves propagating through source-free media, these energy fluxes are quadratic in field variables so that their properties are not easily predictable. Notwithstanding, their near-field behaviors play important roles in nanoscale photonics. For time-oscillatory fields, we found two hitherto-overlooked distinctions between the two internal flows. The first is an unequal level between them because the vorticity of an orbital energy flux plays a role comparable to a spin energy flux itself. The second is regarding the electric-magnetic dual symmetry in handling the two internal flows, whence the reactive helicity plays a role as important as the electromagnetic helicity. By helicity conservation, an inter-electric-magnetic transport is possible for the spin angular momentum density, while the electric and magnetic constituents of orbital energy fluxes admit only respective intra-electric and intra-magnetic transports. We have tested the validities of all these claims by exemplarily taking the electromagnetic fields induced by an electric point dipole, either a linear or a circular one. We have thus made new contributions not only in deriving explicit forms of the internal energy flows but also in revealing the magnetic activities hidden under the electromagnetic waves induced by electric point dipoles.
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来源期刊
Progress in Optics
Progress in Optics 物理-光学
CiteScore
4.50
自引率
0.00%
发文量
8
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