Nonreciprocal propagating electromagnetic modes without phase gradients

作者：Guo, Rui-Peng^*; Wu, Li-Ting; Yang, Mu; Guo, Tian-Jing; Cui, Hai-Xu; Cao, Xue-Wei; Chen, Jing

来源：Physical Review A, 2015, 91(2): 023808.

DOI：10.1103/PhysRevA.91.023808

• Destructive interference
• Dielectric interface
• Electromagnetic modes
• Existence conditions
• Field simulation
• Group velocities
• Lateral displacements
• Normal incidence

We introduce a concept of a k-zero mode, an electromagnetic wave with a nonzero group velocity (partial derivative omega/partial derivative k not equal 0) but a null phase gradient (k = 0). Existence conditions of k-zero modes are discussed. We emphasize that the existence of k-zero modes is closely related to the the unique nonzero lateral displacement when reflected from a magneto-optical (MO) medium at normal incidence. Consequently, the waveguide should be suitably designed to avoid a destructive interference between the lateral displacements at different MO-dielectric interfaces. Numerical full-field simulation proves our analysis. The importance of this study is discussed.

• 出版日期2015-2-5
• 单位南开大学