Fig. 4: Comparison of light field profiles with theory.

a Simulated electric field distribution excited by a laser beam (wavelength of 1550 nm) that falls onto the input antenna (taken in the plane of the waveguide at the half-height of the waveguide and calculated with the help of Lumerical FDTD solutions). b Simulated electric field distribution in the cross-section of the plasmonic slot waveguide calculated with the help of Comsol software. c The line-scan of the norm of electric field calculated at the graphene position. d Comparison of the simulated field profile in the plasmonic slot waveguide (the red solid line) with the reconstructed profile obtained with a p-n junction moved in graphene by gating (the blue circles).