School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, United Kingdom.
Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Kowloon, Hong Kong.
Phys Rev Lett. 2015 Mar 13;114(10):103902. doi: 10.1103/PhysRevLett.114.103902. Epub 2015 Mar 10.
By considering gauge transformations on the macroscopic Maxwell's equations, a two-dimensional gauge field, with its pseudomagnetic field in the real space, is identified as tilted anisotropy in the constitutive parameters. We show that the optical spin Hall effect with broadband response and one-way edge states become possible simply by using anisotropic media. The proposed gauge field also allows us to obtain unidirectional propagation for a particular pseudospin based on the Aharonov-Bohm effect. Our approach will be useful in spoof magneto-optics with arbitrary magnetic fields mimicked by metamaterials with subwavelength unit cells. It also serves as a generic way to design polarization-dependent devices.
通过考虑宏观麦克斯韦方程组的规范变换，我们将二维规范场及其在实空间中的赝磁场识别为各向异性的倾斜各向异性。我们表明，通过使用各向异性介质，可以实现具有宽带响应和单向边缘态的光学自旋霍尔效应。所提出的规范场还使我们能够基于 Aharonov-Bohm 效应获得特定赝自旋的单向传播。我们的方法将在利用亚波长单元的超材料模拟任意磁场的仿磁光领域中非常有用。它也是设计偏振相关器件的通用方法。
