${\cal PT}$对称晶格中波前焦散轨迹的工程化
Engineering wavefront caustics trajectories in ${\cal PT}$-symmetric lattices
摘要：
我们利用焦散理论在${\cal PT}-$对称晶格设计聚焦和弯曲光束动力学。我们表明，在这些系统中的增益和损耗参数提供了一个额外的自由度，允许设计相同的焦散线轨迹与不同的强度分布在各个波导。此外，我们可以在任何近轴距离$z_f$处创建无像差焦点，具有非常大的焦点强度。
英文摘要：
We utilize caustic theory in ${\cal PT}-$symmetric lattices to design focusing and curved beam dynamics. We show that the gain and loss parameter in these systems provides an addition degree of freedom which allows for the design of the same caustics trajectories with different intensity distribution in the individual waveguides. Moreover we can create aberration-free focal points at any paraxial distance $z_f$, with anomalously large focal intensity.
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