title: Shifting of surface plasmon resonance due to electromagnetic coupling between graphene and Au nanoparticles.
abstract: Shifting of the surface plasmon resonance wavelength induced by the variation of the thickness of insulating spacer between single layer graphene and Au nanoparticles is studied. The system demonstrates a blue-shift of 29 nm as the thickness of the spacer layer increases from 0 to 15 nm. This is due to the electromagnetic coupling between the localized surface plasmons excited in the nanoparticles and the graphene film. The strength of the coupling decays exponentially with a decay length of d/R = 0.36, where d is the spacer layer thickness and R is the diameter of the Au nanoparticles. The result agrees qualitatively well with the plasmon ruler equation. Interestingly, a further increment of the spacer layer thickness induces a red-shift of 17 nm in the resonance wavelength and the shift saturates when the thickness of the spacer layer increases above 20 nm.
authors.affiliation: Department of Electrical and Computer Engineering, National University of Singapore, 117576, Singapore.
authors.forename: Jing
authors.initials: J
authors.lastname: Niu
authors.forename: Young Jun
authors.initials: YJ
authors.lastname: Shin
authors.forename: Jaesung
authors.initials: J
authors.lastname: Son
authors.forename: Youngbin
authors.initials: Y
authors.lastname: Lee
authors.forename: Jong-Hyun
authors.initials: JH
authors.lastname: Ahn
authors.forename: Hyunsoo
authors.initials: H
authors.lastname: Yang
mesh_terms: D003198:Computer Simulation; D004574:Electromagnetic Fields; D006046:Gold / Q000737:chemistry* / Q000528:radiation effects; D006108:Graphite / Q000737:chemistry* / Q000528:radiation effects; D008027:Light; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000528:radiation effects; D008956:Models, Chemical; D012542:Scattering, Radiation; D020349:Surface Plasmon Resonance / Q000379:methods*
chemical_list: D006046:Gold; D006108:Graphite