Kim Minkyung, Lee Dasol, Kim Yeseul, Rho Junsuk
Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea.
Department of Biomedical Engineering, Yonsei University, Wonju 26493, Republic of Korea.
Nanophotonics. 2022 Jan 26;11(11):2803-2809. doi: 10.1515/nanoph-2021-0794. eCollection 2022 Jun.
The spin Hall effect of light (SHEL) is the microscopic spin-dependent splitting of light at an optical interface. Whereas the spin Hall shift under linearly polarized light is well-formulated, studies on the SHEL under elliptically or circularly polarized light have primarily relied on numerical computation. In this work, an explicit analytic formula for the spin Hall shift is derived under arbitrarily polarized incidence. Furthermore, from this explicit expression, we demonstrate that the spin Hall shift can be enhanced at any incident angle by using polarization degree of freedom and is independent of the Fresnel coefficients of an interface under circularly polarized light. The analytic formula will help us understand the SHEL under general polarization intuitively and realize unprecedented modulation of the SHEL.
光的自旋霍尔效应（SHEL）是光在光学界面处发生的微观自旋相关分裂。虽然线偏振光下的自旋霍尔位移已有完善的理论表述，但椭圆偏振光或圆偏振光下的光自旋霍尔效应研究主要依赖于数值计算。在这项工作中，我们推导出了任意偏振入射下自旋霍尔位移的显式解析公式。此外，从这个显式表达式可以看出，利用偏振自由度，自旋霍尔位移在任何入射角下都可以增强，并且在圆偏振光下与界面的菲涅耳系数无关。该解析公式将有助于我们直观地理解一般偏振下的光自旋霍尔效应，并实现前所未有的光自旋霍尔效应调制。
