A particular class of focused, pulsed light beams can propagate self-similarly in free space at a fixed group velocity. Now, scientists present a law of refraction that determines how the group velocity of these beams changes as they refract at an interface between two materials.
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Ginis, V. Refracting spacetime wave packets. Nat. Photonics 14, 405–407 (2020). https://doi.org/10.1038/s41566-020-0652-7
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DOI: https://doi.org/10.1038/s41566-020-0652-7
