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Steering transport of ultrashort polariton wavepackets is essential forachieving on-chip integrated nanocircuits with tightly confined electromagneticfields towards ultrafast information processing. However, conventional opticaltechniques have struggled to integrate the necessary components fortransferring polariton signals. Here, we address this challenge by electricallygenerating, manipulating, and reading out terahertz graphene plasmon-polaritonwavepackets on-chip. By injecting an electrical pulse into graphene via anohmic contact, we achieve coherent conversion of the pulse into a plasmonwavepacket exhibiting a pulse duration of 1.2 ps and extreme three-dimensionalspatial confinement within a volume of $2.1 \times 10^{-18} m^3$. We reveal thetransport properties of plasmons along graphene ribbons in different dielectricenvironments, providing a basis for designing graphene plasmonic circuits.Furthermore, we find that the conversion efficiency between the electricalpulses and plasmon wavepackets reaches ~30% thanks to the absence of a momentummismatch. With unprecedented controllability, our platform represents asignificant advance in on-chip handling of plasmonic signals in various van derWaals heterostructures.

On-chip transfer of ultrashort graphene plasmon wavepackets using terahertz electronics