Mr. Angus R. Mcleod Profile

Angus R. Mcleod

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Proceedings Article | 24 September 2013 Paper

Simulation of Au particle interaction on graphene sheets

A. Mcleod, K. Vernon, A. Rider, K. Ostrikov

Proceedings Volume 8814, 88140Z (2013) https://doi.org/10.1117/12.2022820

KEYWORDS: Particles, Graphene, Gold, Nanoparticles, Plasmons, Data modeling, Polarization, Sensors, Optical spheres, Refractive index

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The interaction of Au particles with few layer graphene is of interest for the formation of the next generation of sensing devices ¹. In this paper we investigate the coupling of single gold nanoparticles to a graphene sheet, and multiple gold nanoparticles with a graphene sheet using COMSOL Multiphysics. By using these simulations we are able to determine the electric field strength and associated hot-spots for various gold nanoparticle-graphene systems. The Au nanoparticles were modelled as 8 nm diameter spheres on 1.5 nm thick (5 layers) graphene, with properties of graphene obtained from the refractive index data of Weber 2 and the Au refractive index data from Palik 3. The field was incident along the plane of the sheet with polarisation tested for both s and p. The study showed strong localised interaction between the Au and graphene with limited spread; however the double particle case where the graphene sheet separated two Au nanoparticles showed distinct interaction between the particles and graphene. An offset was introduced (up to 4 nm) resulting in much reduced coupling between the opposed particles as the distance apart increased. Findings currently suggest that the graphene layer has limited interaction with incident fields with a single particle present whilst reducing the coupling region to a very fine area when opposing particles are involved. It is hoped that the results of this research will provide insight into graphene-plasmon interactions and spur the development of the next generation of sensing devices.

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