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We present free-electron imaging of sub-cycle spatio-temporal dynamics of 2D polariton wavepackets, demonstrating the first simultaneous time-, space-, and phase-resolved measurement of such phenomena, and resolving their novel features like vortex-anti-vortex singularities for record-low intensities.
Christophe Moser, Antoine Vincent Boniface, María Isabel Álvarez Castaño, Buse Ünlü
Martinus Adela Maria Gijs, Raphaël Etienne Jean Trouillon, Hui Yang, Gergely Huszka