We studied the interference resulting from the superposition of optical lattices, which are non-diffracting fields propagating in free space, and showed a Talbot self-imaging effect. These lattices are formed by spatially Fourier transforming a “quasi”-orbital angular momentum (OAM) state. We experimentally observed that although the Talbot images change, the Talbot length is insensitive to the topological charge of the “quasi”-OAM state. Our findings can be useful for laser-written photonic lattices.

中文翻译：

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带拓扑电荷的光学晶格中的Talbot效应

我们研究了由于光学晶格的叠加而产生的干涉，这些晶格是在自由空间中传播的非衍射场，并显示出Talbot自成像效应。这些晶格是通过空间傅立叶变换“准”轨道角动量（OAM）状态形成的。我们通过实验观察到，尽管塔尔伯特（Talbot）图像发生了变化，但塔尔伯特（Talbot）的长度对“准” -OAM状态的拓扑电荷不敏感。我们的发现对于激光写入的光子晶格可能很有用。