Giant photonic spin Hall effect in momentum space in a structured metamaterial with spatially varying birefringence  

作　　者：Xiaohui Ling Xinxing Zhou Xunong Yi Weixing Shu Yachao Liu Shizhen Chen Hailu Luo Shuangchun Wen Dianyuan Fan 

机构地区：[1]Laboratory for Spin Photonics,School of Physics and Electronics,Hunan University,Changsha 410082,China [2]Department of Physics and Electronic Information Science,Hengyang Normal University,Hengyang 421002,China [3]SZU-NUS Collaborative Innovation Center for Optoelectronic Science&Technology,and Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province,Shenzhen University,Shenzhen 518060,China

出　　处：《Light(Science & Applications)》2015年第1期354-359,共6页光（科学与应用)（英文版）

基　　金：This research was partially supported by the National Natural Science Foundation of China(Grants No.11274106,No.11474089 and No.11447010);the China Postdoctoral Science Foundation(Grant No.2014M562198);the Scientific Research Fund of Hunan Provincial Education Department of China(Grant No.13B003);the Natural Science Foundation of Hunan Province(Grant No.2015JJ3026).

摘　　要：The photonic spin Hall effect(SHE)in the reflection and refraction at an interface is very weak because of the weak spin-orbit interaction.Here,we report the observation of a giant photonic SHE in a dielectric-based metamaterial.The metamaterial is structured to create a coordinate-dependent,geometric Pancharatnam–Berry phase that results in an SHE with a spin-dependent splitting in momentum space.It is unlike the SHE that occurs in real space in the reflection and refraction at an interface,which results from the momentum-dependent gradient of the geometric Rytov–Vladimirskii–Berry phase.We theorize a unified description of the photonic SHE based on the two types of geometric phase gradient,and we experimentally measure the giant spin-dependent shift of the beam centroid produced by the metamaterial at a visible wavelength.Our results suggest that the structured metamaterial offers a potential method of manipulating spin-polarized photons and the orbital angular momentum of light and thus enables applications in spin-controlled nanophotonics.

关 键 词：geometric phase METAMATERIAL photonic spin Hall effect 

分 类 号：O43[机械工程—光学工程]