手征和运动介质界面异常光自旋霍尔效应  

Anomalous spin Hall effects of light on the interfaces of chiral and moving media

作　　者：曾天海[1] 王海雷[2] 张向东[1,2] 

机构地区：[1]北京理工大学物理学院,北京100081 [2]北京师范大学物理系,北京100878

出　　处：《物理》2012年第6期382-386,共5页Physics

基　　金：国家自然科学基金(批准号:10825416)资助项目

摘　　要：文章讨论了偏振高斯光束在空气-手征介质界面的反射和折射问题,发现了反射和折射光束的异常自旋霍尔效应.在某些特定的角度下,反射高斯光束重心的移动可以达到几十个波长的量级,通过调节手征参数,甚至会出现折射光重心移动方向由正到负的转变.文章还讨论了任意偏振高斯光束在空气-运动介质界面的反射和透射问题,当介质垂直于入射平面运动时,反射和透射光束的横向移动可以达到几个波长的量级,甚至在某些运动速度下可以实现移动方向正负的改变.这些研究对控制光的自旋霍尔效应提供了可能的途径.We discuss the issue of reflection and refraction of a polarized Gaussian beam at the interface between a transparent medium and a chiral metamaterial. Some unusual spin Hall effects of the reflected and transmitted light have been found. It is shown that the spin-dependent displacements of the reflected beam centroid can not only reach several tens of wavelengths at certain incident angles, but also the reverse effect for the transmitted beams can be realized by tuning the chiral parameters. We also discuss the issue of reflection and refraction of a polarized Gaussian beam at the interface between the dielectric medium and the moving medium. The Imbert Fedorov shifts of the reflected and transmitted beams can reach several wavelengths of incident beam at a certain velocity when the slab moves perpendicularly to the incident plane. These findings provide a pathway for controlling the spin Hall effects of light.

关 键 词：自旋霍尔效应 手征介质 运动介质 横向移动 偏振高斯光束 

分 类 号：O469[理学—凝聚态物理] O431[理学—电子物理学]