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.
@article{arxiv.1208.4673,
title = {Shifting of surface plasmon resonance due to electromagnetic coupling between graphene and Au nanoparticles},
author = {Jing Niu and Young Jun Shin and Jaesung Son and Youngbin Lee and Jong Hyun Ahn and Hyunsoo Yang},
journal= {arXiv preprint arXiv:1208.4673},
year = {2015}
}