Enhanced and tunable terahertz spin hall effect of reflected light due to tamm plasmons with topological insulators
Enhanced and tunable terahertz spin hall effect of reflected light due to tamm plasmons with topological insulators
复制标题
由于具有拓扑绝缘体的 tamm 等离子体，反射光的增强和可调太赫兹自旋霍尔效应
DOI：
10.1016/j.rinp.2020.103392
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发表时间：
2020-12-01
影响因子：
5.3
通讯作者：
Dong, Jun
中科院分区：
文献类型：
--
作者：
Jiang, Leyong;Deng, Haiqin;Dong, Jun
本文采用Bi2Se3、间隔层和分布布拉格反射镜组成的多层结构实现了太赫兹（THz）反射光的光子自旋霍尔效应（PSHE）增强。这种增强的自旋霍尔效应（SHE）现象源于Bi2Se3和分布式布拉格反射器结构之间的界面处的光学Tamm态（OTS）的激发。研究发现，通过适当改变拓扑绝缘体的费米能级，可以灵活地控制反射光的PSHE。此外，复合结构的自旋行为也被证明是敏感的入射角和间隔层的色散特性，从而使这种配置的一个有效的候选人开发光子器件的基础上光子PSHE在太赫兹范围。
In this paper, the enhanced photonic spin hall effect (PSHE) of reflected light at terahertz (THz) frequencies is achieved by using a multilayer structure consisting of Bi2Se3, spacer layer, and distributed Bragg reflector structure. This enhanced spin hall effect (SHE) phenomenon originates from the excitation of optical Tamm states (OTSs) at the interface between the Bi2Se3 and distributed Bragg reflector structure. It is found that the PSHE of the reflected light can be flexibly controlled by properly varying the Fermi energy of the topological insulators. Moreover, the spin behavior of the composite structure is also proved sensitive to incidence angle and the dispersion characteristics of the spacer layer, thus making this configuration an effective candidate for developing photonic devices based on photonic PSHE at the terahertz range.