  Surface plasmons in graphene provide a compelling strategy for advanced
photonic technologies thanks to their tight confinement, fast response and
tunability. Recent advances in the field of all optical generation of graphene
plasmons in planar waveguides offer a promising method for high speed signal
processing in nanoscale integrated optoelectronic devices. Here, we use two
counter propagating frequency combs with temporally synchronized pulses to
demonstrate deterministic all optical generation and electrical control of
multiple plasmon polaritons, excited via difference frequency generation (DFG).
Electrical tuning of a hybrid graphene fibre device offers a precise control
over the DFG phase matching, leading to tunable responses of the graphene
plasmons at different frequencies across a broadband (0 - 50 THz) and provides
a powerful tool for high speed logic operations. Our results offer insights for
plasmonics on hybrid photonic devices based on layered materials and pave the
way to high speed integrated optoelectronic computing circuits.
