Department of Physics, Michigan Technological University, Houghton, Michigan 49931, USA.
Opt Lett. 2011 Nov 15;36(22):4359-61. doi: 10.1364/OL.36.004359.
We present an analytical proof of the existence of unidirectional optical Bloch oscillations in a waveguide array system. It is shown that the presence of nonreciprocity in the system allows for a complete normal-mode dephasing in one of the propagation directions, resulting in a unidirectional breakdown in Bloch oscillations. A model system consisting of an array of transversely magnetized asymmetric Si/SiO2 waveguides with a magneto-optic cover layer is presented. Large index contrasts between film and cover are critical for practical realizations.
我们提出了一种在波导阵列系统中存在单向光学布洛赫振荡的解析证明。结果表明，系统中的非互易性允许在一个传播方向上完全正常模式退相，从而导致布洛赫振荡的单向破坏。提出了一个由具有磁光覆盖层的横向磁化非对称 Si/SiO2 波导阵列组成的模型系统。薄膜和覆盖层之间的大折射率对比度对于实际实现至关重要。
