Zhang Ze-Zheng, Yuan Jia-Qi, Sun Lin-Shan, Zhao Bo, Zhang Yan-Rong, Kang Ming, Chen Jing
Opt Express. 2019 Sep 16;27(19):27385-27395. doi: 10.1364/OE.27.027385.
In a single magneto-optical (MO) waveguide, the dispersion of guided bulk wave is reciprocal in the Voigt configuration. Here we show that the parity-time ( ) phase in two coupled MO waveguides can be nonreciprocal if the waveguides are properly biased. The nonreciprocal phase is closely related to the asymmetric field profile induced by the MO effect that modifies the coupling strength between adjacent waveguides. We show that it is feasible to switch between broken and conserved phases by simply reversing the magnetic bias or the propagating direction of wave. Theoretical analysis and numerical calculation prove our theory. This investigation highlights a flexible method in manipulating the field dynamics of waveguide arrays by using the novel properties of phase especially the exceptional points.
在单个磁光（MO）波导中，导行体波的色散在沃伊特配置下是互易的。在此我们表明，如果对两个耦合的MO波导进行适当偏置，其宇称 - 时间（ ）相位可以是非互易的。非互易 相位与由磁光效应引起的不对称场分布密切相关，该效应会改变相邻波导之间的耦合强度。我们表明，通过简单地反转磁偏置或波的传播方向，在破缺和守恒的 相位之间切换是可行的。理论分析和数值计算证明了我们的理论。这项研究突出了一种利用 相位的新颖特性，特别是例外点，来灵活操纵波导阵列场动力学的方法。
