4.4 Article

Refraction of space-time wave packets: III. experiments at oblique incidence

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OPTICAL SOC AMER
DOI: 10.1364/JOSAA.430109

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  1. Office of Naval Research [N00014-17-1-2458]

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The refraction of space-time wave packets at planar interfaces between non-dispersive, homogeneous, isotropic dielectrics exhibits fascinating phenomena, even at normal incidence. Crucial differences emerge at oblique incidence with respect to the results established at normal incidence, such as the ability to tune the group velocity simply by changing the angle of incidence. An experimental verification of the refractive phenomena exhibited by ST wave packets at oblique incidence is provided, along with a proposal for blind synchronization, which has been demonstrated experimentally for the first time.
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)]. 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. (C) 2021 Optical Society of America

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