平面波散射中的横自旋和横动量
Transverse spin and transverse momentum in scattering of plane waves
摘要：
研究了球形散射体散射波的自旋角动量密度和坡印廷矢量的近场到远场演化。结果表明，在近场，SAM密度和坡印廷矢量主要由其横向分量决定。前者（横向SAM）与入射圆偏振态的螺旋度无关，而后者（横向坡印廷矢量）则取决于偏振态。它进一步表明，横向SAM和横向动量分量的幅度和空间范围可以通过利用横向电和横向磁散射模式的干涉可控地增强。
英文摘要：
We study the near field to the far field evolution of spin angular momentum (SAM) density and the Poynting vector of the scattered waves from spherical scatterers. The results show that at the near field, the SAM density and the Poynting vector are dominated by their transverse components. While the former (transverse SAM) is independent of the helicity of the incident circular polarization state, the latter (transverse Poynting vector) depends upon the polarization state. It is further demonstrated that the magnitudes and the spatial extent of the transverse SAM and the transverse momentum components can be controllably enhanced by exploiting the interference of the transverse electric and transverse magnetic scattering modes.
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