Spin Hall Effect under Arbitrarily Polarized or Unpolarized Light,Laser & Photonics Reviews

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Spin Hall Effect under Arbitrarily Polarized or Unpolarized Light
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2021-06-04 , DOI: 10.1002/lpor.202100138
Minkyung Kim ₁ , Dasol Lee ₁ , Junsuk Rho _{1,

2}

Affiliation

The spin Hall effect of light (SHEL), which refers to a spin-dependent and transverse splitting of refraction and reflection phenomena, inherently depends on the polarization states of incidence. Most previous research has focused on horizontally or vertically polarized incidence, in which the analytic expressions of the shift are well-formulated and the SHEL appears symmetrically in both shift and intensity. However, the SHEL under arbitrarily polarized or unpolarized incidence has remained largely unexplored. Here, it is proved analytically and numerically that the SHEL is independent of the incident polarization and is symmetrical in shift if the two linear polarization states have the same Fresnel coefficients. Moreover, under an unpolarized incidence composed of a large number of completely random polarization states, the reflected beam is split in half into two circularly polarized components that undergo the same amount of splitting but in opposite directions. This result demonstrates that under unpolarized incidence, the SHEL occurs exactly as it does under horizontally or vertically polarized incidence. It is believed that the incident-polarization-independent SHEL can broaden the applicability of the SHEL to cover optical systems in which the polarization is unspecified.

中文翻译：

任意偏振或非偏振光下的自旋霍尔效应

光的自旋霍尔效应 (SHEL) 是指折射和反射现象的自旋相关和横向分裂，本质上取决于入射的偏振态。以前的大多数研究都集中在水平或垂直极化入射上，其中偏移的解析表达式得到了很好的表述，并且 SHEL 在偏移和强度上对称出现。然而，在任意极化或非极化入射下的 SHEL 在很大程度上仍未得到探索。在这里，通过分析和数值证明，如果两个线性偏振态具有相同的菲涅耳系数，则 SHEL 与入射偏振无关，并且在位移上是对称的。而且，在由大量完全随机偏振态组成的非偏振入射下，反射光束被分成两半，分成两个圆偏振分量，这些分量经历相同的分裂量，但方向相反。该结果表明，在非偏振入射下，SHEL 的发生与在水平或垂直偏振入射下发生的情况完全相同。据信，与入射偏振无关的 SHEL 可以扩大 SHEL 的适用性，以涵盖未指定偏振的光学系统。

更新日期：2021-07-08

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