Graphene is well suited for a number of photonic applications due to its interesting optical and electronic properties.The intrinsic collective excitation in graphene has attracted much attention.Specifically, surface plasmons in graphene are believed to be potential ingredients for infrared and terahertz applications.Recently,graphene plasmons are not only theoretically investigated in structured graphene, such as graphene ribbons,coupled graphene ribbons, graphene ribbon arrays, graphene rings, and graphene disk arrays, but also studied experimentally in microribbon arrays and extended graphene sheets.