Graphene plasmons and retardation: Strong light-matter coupling

This paper studies the retardation regime of doped graphene plasmons, given by the nominal crossing of the unretarded plasmon and light-cone. In addition to modifications in the plasmon dispersion relation, retardation implies strong coupling between propagating light and matter, even for homogeneou...

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Bibliographic Details
Published in:Europhysics letters 2012-07, Vol.99 (2), p.P1-P1
Main Authors: Gomez-Santos, G, Stauber, T
Format: Article
Language:English
Subjects:
Dispersions
Graphene
Joining
Perforated metals
Plasmonics
Plasmons
Response functions
Sheet metal
Online Access:Get full text
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Summary:This paper studies the retardation regime of doped graphene plasmons, given by the nominal crossing of the unretarded plasmon and light-cone. In addition to modifications in the plasmon dispersion relation, retardation implies strong coupling between propagating light and matter, even for homogeneous graphene, which opens up the possibility of efficient plasmonics in simple graphene devices. The paper exemplify this enhancement in a double-layer configuration that exhibits perfect (if lossless) light transmissions across a classically forbidden region, providing a simpler analog of the corresponding phenomenon in perforated metal sheets. This article also shows that (broad) Fabry-Perot resonances present without graphene turn into sharply peaked, quasi-discrete modes in the presence of graphene where graphene's response function is given by the typical Fano lineshape.
ISSN:0295-5075
1286-4854