Department of Physics, Michigan Technological University, Houghton, Michigan 49931, USA.
Opt Lett. 2010 Sep 15;35(18):3147-9. doi: 10.1364/OL.35.003147.
We show that nonreciprocal optical Bloch-like oscillations can emerge in transversely magnetized waveguide arrays in the presence of an effective index step between the waveguides. Normal modes of the system are shown to acquire different wavenumbers in opposite propagation directions. Significant differences in phase coherence and decoherence between these normal modes are presented and discussed. Nonreciprocity is established by imposing unequal vertical refractive index gradients at the substrate/core and core/cover interfaces in the presence of transverse magnetization.
我们表明，在存在波导之间的有效折射率阶跃的情况下，横向磁化波导阵列中会出现非互易类 Bloch 型振荡。系统的正常模式在相反的传播方向上表现出不同的波数。呈现并讨论了这些正常模式之间的相位相干性和退相干性的显著差异。通过在横向磁化的情况下，在基底/芯和芯/覆盖界面处施加不相等的垂直折射率梯度，可以实现非互易性。
