转换反射中光自旋霍尔效应的自旋堆积方向

魏桂萍; 周新星; 李瑛; 罗海陆; 文双春

doi:doi:10.3788/aos201232.0726003

光学学报, 2012, 32 (7): 0726003, 网络出版: 2012-05-24

转换反射中光自旋霍尔效应的自旋堆积方向

Switching the Directions of Spin Accumulation of Spin Hall Effect of Light in Reflection

论文大纲

魏桂萍 ^*周新星李瑛罗海陆文双春

作者单位

湖南大学信息科学与工程学院微纳光电器件及应用教育部重点实验室, 湖南长沙 410082

物理光学光自旋霍尔效应自旋堆积弱测量自旋角动量 physical optics spin Hall effect of light spin accumulation weak measurements spin angular momentum

摘要

从理论上和实验上研究了转换反射中光自旋霍尔效应的自旋堆积方向的方法，建立了描述光束在空气棱镜界面反射的自旋堆积模型，揭示了横移与光束入射偏振角的定性关系。研究发现，当入射角小于布儒斯特角时，随着入射偏振角的逐渐增大，自旋堆积的方向发生反转。而当入射角大于布儒斯特角时，自旋堆积的方向不再随入射偏振角的变化而反转。结果表明，在光束入射角为确定值且小于布儒斯特角的情况下，可以通过调控光束的入射偏振角转换自旋堆积的方向。转换自旋堆积方向的研究为有效调控光自旋霍尔效应提供了新的途径。

Abstract

The method on switching the direction of spin accumulation of spin Hall effect of light in reflection is studied theoretically and experimentally. A model describing spin accumulation of reflected light at the interface between air and prism is established. And the qualitative relation between traverse shift and the polarization angle of incident beam is revealed. The direction of spin accumulation will reverse with the increase of the polarization angle of incident light on condition that the incident angle is fixed and less than Brewster angle. But the direction of spin accumulation won′t flip with polarization angle if the incident angle is bigger than Brewster angle. The results show that the direction of spin accumulation can be switched by adjusting the polarization angle of incident light while the incident angle is fixed and less than Brewster angle. The study about the direction of spin accumulation provides a new pathway for modulating the spin Hall effect of light.

参考文献

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魏桂萍, 周新星, 李瑛, 罗海陆, 文双春. 转换反射中光自旋霍尔效应的自旋堆积方向[J]. 光学学报, 2012, 32(7): 0726003. Wei Guiping, Zhou Xinxing, Li Ying, Luo Hailu, Wen Shuangchun. Switching the Directions of Spin Accumulation of Spin Hall Effect of Light in Reflection[J]. Acta Optica Sinica, 2012, 32(7): 0726003.

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