a b s t r a c t

The plasmon induced transparency (PIT) effect is investigated in a graphene-based waveguide, which is composedof a graphene bus waveguide side-coupled with a graphene strip directly and a graphene ring indirectly.Conventional numerical simulations based on finite element method (FEM) are used to study the transmissionproperties through optimizing the relevant parameters, and it is proved that the simulation results agree wellwith the analytical results. Then as one of the potential application branches of the PIT-like effect, the propertyof refractive index sensing with a higher sensitivity of 4160 nm/RIU is further studied. The result can help todeepen the understanding of PIT-like effect and nano sensor, and it would be also beneficial for the studies andapplications of nanoscale graphene-based optical devices.