由于增益/损耗分布的周期性空间调制引起的子衍射和空间滤波
Subdiffraction and spatial filtering due to periodic spatial modulation of the gain/loss profile
摘要：
我们研究了光在横向和纵向都具有周期性调制增益/损耗分布的材料中的传播，即在空间具有二维调制的材料中。我们预测的自准直（无衍射传播）的光束，以及超扩散（空间频率滤波）的光束在依赖于增益/损耗晶格的几何形状的影响，并证明预测的傍轴波传播方程的数值模拟。
英文摘要：
We investigate light propagation through materials with periodically modulated gain/loss profile in both transverse and longitudinal directions, i.e. in material with two-dimensional modulation in space. We predict effects of self-collimation (diffraction-free propagation) of the beams, as well as superdiffusion (spatial frequency filtering) of the beams in depending on the geometry of the gain/loss lattice, and justify the predictions by numerical simulations of the paraxial wave propagation equations.
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