▎ 摘　　要

We experimentally investigated the nonlinear optical response in few-layered graphene/silver nanowires (G/NWs) hybrid films that consist of two-dimensional graphene and network of one-dimensional silver nanowires, and found an enhanced third-order optical nonlinearity based on the open-aperture femtosecond Z-scan measurement. The enhancement of the optical nonlinearity is attributed to interfacial nanowires network on graphene for large local field enhancement and exciton-plasmon-photon conversion channel. In addition, accelerated carrier relaxation times in G/NWs are also observed by optical pump-probe spectroscopy, in which nanowires might supply an additional relaxation channel for graphene. The nanowire-induced defects and the increase of either electrons or holes induced by charge transfer may also contribute to the ultrafast dynamics in G/NWs. Our findings provide a new avenue of modulating the nonlinear optical response of graphene-related materials, and further suggest that G/NWs could be developed as nonlinear optical material in novel tunable laser photonics devices, such as laser mode locker, Q switcher, etc.