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首页> 外文期刊>Physical Review X >Magnetic and Electric Transverse Spin Density of Spatially Confined Light
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Magnetic and Electric Transverse Spin Density of Spatially Confined Light

机译：空间狭窄光的磁性电动横向旋转密度

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When a beam of light is laterally confined, its field distribution can exhibit points where the local magnetic and electric field vectors spin in a plane containing the propagation direction of the electromagnetic wave. The phenomenon indicates the presence of a nonzero transverse spin density. Here, we experimentally investigate this transverse spin density of both magnetic and electric fields, occurring in highly confined structured fields of light. Our scheme relies on the utilization of a high-refractive-index nanoparticle as a local field probe, exhibiting magnetic and electric dipole resonances in the visible spectral range. Because of the directional emission of dipole moments that spin around an axis parallel to a nearby dielectric interface, such a probe particle is capable of locally sensing the magnetic and electric transverse spin density of a tightly focused beam impinging under normal incidence with respect to said interface. We exploit the achieved experimental results to emphasize the difference between magnetic and electric transverse spin densities.
机译：当光束横向限制时，其场分布可以在局部磁场矢量旋转在包含电磁波的传播方向的平面中旋转的点。该现象表明存在非零横旋旋转密度。在这里，我们通过高度限制的结构形状的光线研究，实验研究了两个磁场的横向旋转密度。我们的方案依赖于利用高折射率纳米粒子作为局部场探针​​，在可见光谱范围内表现出磁性和电偶极子谐振。由于偶极矩的定向排放围绕平行于附近的介电界面的轴，这种探针颗粒能够局部地感测在正常入射时撞击的紧密聚焦光束的磁性和电横旋旋绒密度相对于所述界面。 。我们利用所实现的实验结果来强调磁性和电横旋旋转密度之间的差异。

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