title: Tuning of surface plasmon polaritons beat length in graphene directional couplers.
abstract: We investigate the tuning of the coupling of surface plasmon polaritons between two spatially separated graphene layers. We demonstrate that by slightly changing the chemical potential, a graphene coupler can switch from the bar to the cross state; as a consequence, the coupling coefficient in such structures can be easily controlled by means of an applied electrical signal.
authors: Aldo
authors: A
authors: Auditore
authors: Costantino
authors: C
authors: de Angelis
authors: Andrea
authors: A
authors: Locatelli
authors: Alejandro B
authors: AB
authors: Aceves