title: Plasmon resonance enhanced multicolour photodetection by graphene.
abstract: Graphene has the potential for high-speed, wide-band photodetection, but only with very low external quantum efficiency and no spectral selectivity. Here we report a dramatic enhancement of the overall quantum efficiency and spectral selectivity that enables multicolour photodetection, by coupling graphene with plasmonic nanostructures. We show that metallic plasmonic nanostructures can be integrated with graphene photodetectors to greatly enhance the photocurrent and external quantum efficiency by up to 1,500%. Plasmonic nanostructures of variable resonance frequencies selectively amplify the photoresponse of graphene to light of different wavelengths, enabling highly specific detection of multicolours. Being atomically thin, graphene photodetectors effectively exploit the local plasmonic enhancement effect to achieve a significant enhancement factor not normally possible with traditional planar semiconductor materials.
authors.affiliation: Department of Materials Science and Engineering, University of California, Los Angeles, California 90095, USA.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Liu
authors.forename: Rui
authors.initials: R
authors.lastname: Cheng
authors.forename: Lei
authors.initials: L
authors.lastname: Liao
authors.forename: Hailong
authors.initials: H
authors.lastname: Zhou
authors.forename: Jingwei
authors.initials: J
authors.lastname: Bai
authors.forename: Gang
authors.initials: G
authors.lastname: Liu
authors.forename: Lixin
authors.initials: L
authors.lastname: Liu
authors.forename: Yu
authors.initials: Y
authors.lastname: Huang
authors.forename: Xiangfeng
authors.initials: X
authors.lastname: Duan
mesh_terms: D003116:Color; D004581:Electronics / Q000295:instrumentation / Q000379:methods*; D004867:Equipment Design; D006108:Graphite / Q000737:chemistry*; D008027:Light; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology / Q000295:instrumentation / Q000379:methods*; D055096:Optical Devices; D019904:Polymethyl Methacrylate / Q000737:chemistry; D012666:Semiconductors; D020349:Surface Plasmon Resonance / Q000295:instrumentation / Q000379:methods*
chemical_list: D006108:Graphite; D019904:Polymethyl Methacrylate