Jiang Mengjiang, Lin Hai, Zhuo Linqing, Zhu Wenguo, Guan Heyuan, Yu Jianhui, Lu Huihui, Tan Jieyuan, Chen Zhe
Opt Express. 2018 Mar 19;26(6):6593-6601. doi: 10.1364/OE.26.006593.
The spin Hall effect (SHE) of light beams reflected from an air-chiral interface are investigated systematically. Due to the intrinsic chiral asymmetry of the medium, a horizontally polarized incident Gaussian beam will undergo asymmetric spin splitting, i.e., both the displacements and energies of two spin components of the reflected beam are different. One spin component can undergo large displacement near points of |rpp| = |rsp| (rpp and rsp are the Fresnel reflection coefficients), where the reflected beams are almost in circular polarization states. Moreover, for an incident beam carrying orbital angular momentum (OAM), the two spin components acquire additional OAM dependent shifts, which attribute to the asymmetric spin splitting. Thus, the asymmetric spin splitting of the reflected beam will vary with the incident OAM. These findings provide a deeper insight into the SHE of light, and they may have potential application in precision metrology.
系统地研究了从空气-手性界面反射的光束的自旋霍尔效应（SHE）。由于介质固有的手性不对称性，水平偏振的入射高斯光束将经历不对称的自旋分裂，即反射光束的两个自旋分量的位移和能量都不同。一个自旋分量在|rpp| = |rsp|（rpp和rsp是菲涅耳反射系数）的点附近会发生大位移，此时反射光束几乎处于圆偏振态。此外，对于携带轨道角动量（OAM）的入射光束，两个自旋分量会获得额外的与OAM相关的位移，这归因于不对称的自旋分裂。因此，反射光束的不对称自旋分裂将随入射OAM而变化。这些发现为光的自旋霍尔效应提供了更深入的见解，并且它们可能在精密计量学中有潜在应用。
