Yessenov Murat, Allende Motz Alyssa M, Bhaduri Basanta, Abouraddy Ayman F
J Opt Soc Am A Opt Image Sci Vis. 2021 Oct 1;38(10):1462-1470. doi: 10.1364/JOSAA.430109.
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. A38, 1409 (2021)10.1364/JOSAA.430105]. 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.
时空（ST）波包在非色散、均匀、各向同性电介质的平面界面处的折射展现出迷人的现象，即使在正入射时也是如此。此类折射现象的例子包括界面处群速度不变、反常折射和群速度反转。与正入射时所确立的结果相比，斜入射时会出现关键差异。例如，通过改变入射角就可以简单地调节折射ST波包的群速度。在第三篇论文中，我们给出了ST波包在斜入射时所展现的折射现象的实验验证，这些现象曾在本系列的第一篇论文中有所提及[《美国光学学会志A》38, 1409 (2021)10.1364/JOSAA.430105]。我们还研究了“盲同步”的提议，即相同的ST波包能同时到达不同的接收器，而事先无需知道它们的位置，前提是它们都位于两种介质界面之外的同一深度处。本文给出了这种效应的首个原理验证实验演示。
