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The X-waves are propagating packets which preserve their transverse size far across a longer distance than standard Gaussian beam packet. We triggered for the first time the ignition of a X-shaped packet in planar ie two-dimensional polariton fluid thanks to its nonlinear reshaping and observed its propagation during few tens of picosecond.

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This page is a summary of: Superluminal X-waves in a polariton quantum fluid, Light Science & Applications, August 2017, Springer Science + Business Media, DOI: 10.1038/lsa.2017.119.
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