Enhancement and modulation of photonic spin Hall effect by defect modes in photonic crystals with graphene
Enhancement and modulation of photonic spin Hall effect by defect modes in photonic crystals with graphene
复制标题
石墨烯光子晶体中缺陷模式增强和调制光子自旋霍尔效应
DOI：
10.1016/j.carbon.2018.03.094
复制
发表时间：
2018
期刊：
影响因子：
10.9
通讯作者：
Yao Jianquan
中科院分区：
文献类型：
--
作者：
Li Jie;Tang Tingting;Luo Li;Yao Jianquan
光子自旋霍尔效应（PSHE）在控制光子自旋方面有着巨大的应用潜力。然而，在特定的光学结构中的PSHE的有效控制仍然难以实现。在本文中，我们报道了在一维光子晶体（1D-PC）中的反射光的增强和磁调谐PSHE与缺陷层。通过在一维光子晶体的缺陷层中插入单层石墨烯，获得了大的偏振旋转和强的光子自旋轨道相互作用。由于缺陷模对光场的限制，在特定入射波长下，反射光的克尔旋转角接近90°，自旋相关分裂约为波长的15倍。另外，当静态垂直磁场从1 T增加到11 T时，对克尔旋转角和自旋相关分裂都有很大的调制作用。这些结果为今后基于自旋的光子器件的设计铺平了道路。
Photonic spin Hall effect (PSHE) holds great potential applications for manipulating photon spins. However, the efficient control of PSHE in a particular optical structure is still difficult to realize. In this paper, we report enhanced and magnetically tunable PSHE of reflected light in one-dimensional photonic crystals (1D-PC) with a defect layer. By inserting monolayer graphene into the defect layer of 1D-PC, large polarization rotation and strong photon spin-orbit interaction of reflected light are obtained. Due to the optical field confinement by defect mode, the Kerr rotation angle of reflected light is near 90° and the spin-dependent splitting is about 15 times the wavelength at a specific incident wavelength. In addition, a static perpendicular magnetic field increasing from 1T to 11T shows greatly modulation effect on Kerr rotation angle and spin-dependent splitting. These results pave the way toward the design of spin-based photonic devices in the future.