论文标题
磁光晶体中的拓扑单向大面积波导状态
Topological one-way large-area waveguide states in magnetic photonic crystals
论文作者
论文摘要
我们通过使用由磁性PC的两个结构域之间的普通光子晶体（PC）组成的异质结构，在理论上和实验上实现了大区域的单向传输。非磁性域具有两个正交的单向波导状态，它们的振幅均匀分布在大区域。即使没有磁化媒介，这两个波导状态也支持单向运输。我们在实验上和数字上都表明，这种单向波导状态可用于突然缩小延伸态的梁宽度以浓缩能量。这种扩展的波导模式对于不同种类的缺陷，例如空隙和PEC屏障具有鲁棒性。当引入较大的随机性时，它们也可以免疫Anderson型定位。
We have theoretically and experimentally achieved large-area one-way transport by using heterostructures consisting of a domain of an ordinary photonic crystal (PC) sandwiched between two domains of magnetic PCs. The non-magnetized domain carries two orthogonal one-way waveguide states which have amplitude uniformly distributed over a large-area. These two waveguide states support unidirectional transport even though the medium of propagation is not magnetized. We show both experimentally and numerically that such one-way waveguide states can be utilized to abruptly narrow the beam width of an extended state to concentrate energy. Such extended waveguide modes are robust to different kinds of defects, such as voids and PEC barriers. They are also immune to the Anderson type localization when large randomness is introduced.
