Photonic Spin Hall Effect at Metasurfaces
Photonic Spin Hall Effect at Metasurfaces
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DOI：
10.1126/science.1231758
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发表时间：
2013-03-22
期刊：
影响因子：
56.9
通讯作者：
Zhang, Xiang
中科院分区：
文献类型：
--
作者：
Yin, Xiaobo;Ye, Ziliang;Zhang, Xiang
光的自旋霍尔效应（SHE）由于光子动量极小和自旋轨道相互作用而非常微弱。在这里，我们报告了一个强大的光子SHE导致测量大分裂的偏振光在超颖表面。沿超颖表面沿着快速变化的相位不连续性，打破了系统的轴对称性，使得能够直接观察圆偏振光的大的横向运动，即使在垂直入射下。强烈的自旋-轨道相互作用使偏振光偏离了普通费马原理所规定的轨道。这种强的宽带光子SHE可以为利用光的自旋和轨道角动量进行信息处理和通信提供途径。
The spin Hall effect (SHE) of light is very weak because of the extremely small photon momentum and spin-orbit interaction. Here, we report a strong photonic SHE resulting in a measured large splitting of polarized light at metasurfaces. The rapidly varying phase discontinuities along a metasurface, breaking the axial symmetry of the system, enable the direct observation of large transverse motion of circularly polarized light, even at normal incidence. The strong spin-orbit interaction deviates the polarized light from the trajectory prescribed by the ordinary Fermat principle. Such a strong and broadband photonic SHE may provide a route for exploiting the spin and orbit angular momentum of light for information processing and communication.