多层介质中的光自旋霍尔效应研究

Spin Hall effect of light in a multilayer-medium structure

本文研究了光束通过多层介质分界面的光自旋霍尔效应.以三层介质为例,建立了光束通过棱镜-空气-棱镜结构的传输模型,揭示了横移与空气介质的厚度、折射率梯度以及入射角等因素的定性关系.发现对某一特定的圆偏振光束,改变两棱镜之间的折射率梯度可以调控横移,反射场与传输场的横移方向取决于折射率梯度.相对于两层介质来说,高斯光束通过三层介质能明显地增强光自旋霍尔效应.研究多层介质中光自旋霍尔效应横移的影响因素可为调控和增强光自旋霍尔效应提供理论依据.

In this paper, we study the spin Hall effect （SHE） of light in a multilayer-medium. By taking three-layer medium for example, the three-dimensional transmission model of beams passing through a prim-air-prim barrier is build. The various factors in SHE of light, such as thickness of the air gap, refractive index gradient, and incidence angle are investigated. For a certain circularly polarized component, the transverse shift can be modulated by Changing the refractive index gradient associated with the two prisms： whether the transverse shift of reflection and transmission fields is positive or negative depends on the refractive index gradient. Compared with the SHE in the two-layer medium, the SHE in the Gaussian beam refraction can be evidently enhanced via three-layer medium. Based on the theory of SHE of light,the theoretical basis for regulating and enhancing optical spin Hall effect is obtained.