Impact of Graphene on the Polarizability of a Neighbour Nanoparticle: A Dyadic Green’s Function Study

We discuss the renormalization of the polarizability of a nanoparticle in the presence of either: (1) a continuous graphene sheet; or (2) a plasmonic graphene grating, taking into account retardation effects. Our analysis demonstrates that the excitation of surface plasmon polaritons in graphene pro...

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Bibliographic Details
Published in:Applied sciences 2017-11, Vol.7 (11), p.1158
Main Authors: Amorim, B., Gonçalves, P. A. D., Vasilevskiy, M. I., Peres, N. M. R.
Format: Article
Language:English
Subjects:
Approximation
Dielectric properties
Electric fields
Electromagnetism
Graphene
Interfaces
Microscopy
Nanoparticles
plasmonics, graphene, quantumemitter, dyadic Green’s function, nanoparticle, polarizability
Polarizability
Radiation
Resonance
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Summary:We discuss the renormalization of the polarizability of a nanoparticle in the presence of either: (1) a continuous graphene sheet; or (2) a plasmonic graphene grating, taking into account retardation effects. Our analysis demonstrates that the excitation of surface plasmon polaritons in graphene produces a large enhancement of the real and imaginary parts of the renormalized polarizability. We show that the imaginary part can be changed by a factor of up to 100 relative to its value in the absence of graphene. We also show that the resonance in the case of the grating is narrower than in the continuous sheet. In the case of the grating it is shown that the resonance can be tuned by changing the grating geometric parameters.
ISSN:2076-3417
2076-3417
DOI:10.3390/app7111158