ultra-compact spatial terahertz switch based on graphene plasmonic-coupled waveguide

We are proposing graphene (g)-based multilayered plasmonic spatial switch, operating at 10 thz. it is composed of hbn/ag/hbn/g/hbn/g/hbn/sio2/p+-si multilayers. when a 10-thz transverse magnetic (tm)-polarized signal is normally incident upon the structure top surface, the nanoaperture devised in the ag nanolayer, acting as a grating, excites surface plasmons at the top graphene micro-ribbons/hbn interface. these surface plasmons depending on the graphenes chemical potentials can be coupled to the lower-right or left graphene micro-ribbons and continue to propagate laterally towards the corresponding output port. numerical simulations show that a change of ∆vg ≈ ± 2.7 v in the voltage, applied to the gated micro-ribbons, can modulate their chemical potentials sufficiently to switch the right (left) output port from on (off) to off(on) and vice versa. besides its low power consumption, the switch ultra-small dimensions make it a potential spatial router suitable for thz-integrated circuit applications.