Department of Physics, Stanford University, Stanford, California 94305, USA.
Phys Rev Lett. 2013 Nov 15;111(20):203901. doi: 10.1103/PhysRevLett.111.203901. Epub 2013 Nov 11.
We show that the effective gauge field for photons provides a versatile platform for controlling the flow of light. As an example we consider a photonic resonator lattice where the coupling strength between nearest neighbor resonators are harmonically modulated. By choosing different spatial distributions of the modulation phases, and hence imposing different inhomogeneous effective magnetic field configurations, we numerically demonstrate a wide variety of propagation effects including negative refraction, one-way mirror, and on- and off-axis focusing. Since the effective gauge field is imposed dynamically after a structure is constructed, our work points to the importance of the temporal degree of freedom for controlling the spatial flow of light.
我们证明，光子的有效规范场为控制光的传播提供了一个多功能平台。作为一个例子，我们考虑一个光子共振器格子，其中最近邻共振器之间的耦合强度被谐波调制。通过选择不同的调制相位的空间分布，从而施加不同的非均匀有效磁场配置，我们数值地演示了各种各样的传播效应，包括负折射、单向镜和轴上和轴外聚焦。由于有效规范场是在结构构建之后动态施加的，我们的工作指出了控制光的空间传播的时间自由度的重要性。
