▎ 摘　　要

We demonstrate that the broadband nonlinear optical response of graphene can be resonantly enhanced by more than an order of magnitude through hybridization with a plasmonic metamaterial, while retaining an ultrafast nonlinear response time of similar to 1 ps. Transmission modulation close to similar to 1% is seen at a pump fluence of similar to 30 mu J/cm(2) at the wavelength of similar to 1.6 mu m. This approach allows to engineer and enhance graphene's nonlinearity within a broad wavelength range enabling applications in optical switching, mode-locking, and pulse shaping. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4711044]