(color online) Surface plasmon enhanced photodetection of 2D materials. (a) Plasmonic heptamer-antenna enhanced graphene sandwich photodetection.[68] (b) Plasmonic nanostructures enhanced graphene photodetection.[69] (c) Surface plasmon enhanced photodetection based on 2D heterostructure.[70] (d) Hot electron-based near-infrared photodetection of bilayer MoS2.[7]