title: Surface Plasmon Polariton Graphene Photodetectors.
abstract: The combination of plasmonic nanoparticles and graphene enhances the responsivity and spectral selectivity of graphene-based photodetectors. However, the small area of the metal-graphene junction, where the induced electron-hole pairs separate, limits the photoactive region to submicron length scales. Here, we couple graphene with a plasmonic grating and exploit the resulting surface plasmon polaritons to deliver the collected photons to the junction region of a metal-graphene-metal photodetector. This gives a 400% enhancement of responsivity and a 1000% increase in photoactive length, combined with tunable spectral selectivity. The interference between surface plasmon polaritons and the incident wave introduces new functionalities, such as light flux attraction or repulsion from the contact edges, enabling the tailored design of the photodetector's spectral response. This architecture can also be used for surface plasmon biosensing with direct-electric-redout, eliminating the need of bulky optics.
authors.affiliation: Cambridge Graphene Centre, University of Cambridge , Cambridge CB3 0FA, United Kingdom.|School of Electrical & Electronic Engineering, University of Manchester , Manchester M13 9PL, United Kingdom.
authors.forename: T J
authors.initials: TJ
authors.lastname: Echtermeyer
authors.affiliation: Cambridge Graphene Centre, University of Cambridge , Cambridge CB3 0FA, United Kingdom.
authors.forename: S
authors.initials: S
authors.lastname: Milana
authors.affiliation: Cambridge Graphene Centre, University of Cambridge , Cambridge CB3 0FA, United Kingdom.
authors.forename: U
authors.initials: U
authors.lastname: Sassi
authors.affiliation: Cambridge Graphene Centre, University of Cambridge , Cambridge CB3 0FA, United Kingdom.
authors.forename: A
authors.initials: A
authors.lastname: Eiden
authors.affiliation: Cambridge Graphene Centre, University of Cambridge , Cambridge CB3 0FA, United Kingdom.
authors.forename: M
authors.initials: M
authors.lastname: Wu
authors.affiliation: Department of Materials Science & Engineering, University of Ioannina , Ioannina 45110, Greece.
authors.forename: E
authors.initials: E
authors.lastname: Lidorikis
authors.affiliation: Cambridge Graphene Centre, University of Cambridge , Cambridge CB3 0FA, United Kingdom.
authors.forename: A C
authors.initials: AC
authors.lastname: Ferrari
mesh_terms: D015374:Biosensing Techniques; D006108:Graphite / Q000737:chemistry*; D008027:Light; D008670:Metals / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods; D017785:Photons; D020349:Surface Plasmon Resonance
chemical_list: D008670:Metals; D006108:Graphite
keywords: graphene; photodetection; plasmonics; sensor; surface plasmon polariton