Tuning of graphene plasmons by ferroelectric superdomain for mid-infrared photodetector with high responsivity

A new strategy is demonstrated for confining graphene plasmons to resonantly enhance light–matter interactions for tunable mid-IR detection. Our devices consist of integrating monolayer graphene without patterning onto a nanoribbon-connected ring-shaped ferroelectric superdomain with alternately up- and down-polarization. The simulations show that our devices have a tunable spectral response from 11.7 to 19.5 μ m by both reconfiguring the ferroelectric superdomain and varying the ferroelectric-gated graphene Fermi level. A highest photoresponsivity of 796–947 A W −1 has been achieved in 10–20 μ m. The proof-of-concept photodetector offers the possibility to simplify the fabrication of plasmonic devices and helps the development of applications of tunable mid-IR detection.