The refraction of space-time (ST) wave packets at planar interfaces between non-dispersive, homogeneous, isotropic dielectrics exhibits fascinating phenomena, even at normal incidence. Examples of such refractive phenomena include group-velocity invariance across the interface, anomalous refraction, and group-velocity inversion. Crucial differences emerge at oblique incidence with respect to the results established at normal incidence. For example, the group velocity of the refracted ST wave packet can be tuned simply by changing the angle of incidence. In the third paper, we present experimental verification of the refractive phenomena exhibited by ST wave packets at oblique incidence that were in the first paper of this sequence [J. Opt. Soc. Am. A 38, 1409 (2021) [CrossRef] ]. We also examine a proposal for “blind synchronization,” whereby identical ST wave packets arrive simultaneously at different receivers without a priori knowledge of their locations except that they are all located at the same depth beyond an interface between two media. A first proof-of-principle experimental demonstration of this effect is provided.

中文翻译：

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时空波包的折射：III．斜入射实验

时空 (ST) 波包在非色散、均匀、各向同性电介质之间的平面界面处的折射表现出迷人的现象，即使在垂直入射时也是如此。这种折射现象的例子包括跨界面的群速度不变性、反常折射和群速度反转。斜入射与正常入射时的结果存在重大差异。例如，可以简单地通过改变入射角来调整折射 ST 波包的群速度。在第三篇论文中，我们展示了该序列第一篇论文中 ST 波包在斜入射时表现出的折射现象的实验验证 [J. 选择。社会。是。A 38 , 1409 (2021) [CrossRef] ]。我们还研究了“盲同步”的提议，即相同的 ST 波包同时到达不同的接收器，而无需先验地知道它们的位置，只是它们都位于两种媒体之间界面之外的相同深度。提供了这种效果的第一个原理验证实验演示。