Department of Physics, Wesleyan University, Middletown, Connecticut 06459, USA.
Phys Rev Lett. 2012 Jul 20;109(3):033902. doi: 10.1103/PhysRevLett.109.033902.
We show that complex PT-symmetric photonic lattices can lead to a new class of self-imaging Talbot effects. For this to occur, we find that the input field pattern has to respect specific periodicities dictated by the symmetries of the system. While at the spontaneous PT-symmetry breaking point the image revivals occur at Talbot lengths governed by the characteristics of the passive lattice, at the exact phase it depends on the gain and loss parameter, thus allowing one to control the imaging process.
我们表明，复杂的 PT 对称光子晶格可以导致一类新的自成像塔尔博特效应。要发生这种情况，我们发现输入场模式必须尊重系统对称性规定的特定周期性。虽然在自发 PT 对称破缺点，像的再现发生在由无源晶格特性决定的塔尔博特长度处，但在精确相位处，它取决于增益和损耗参数，从而允许控制成像过程。
