G. Gómez-Santos, T. Stauber
We study 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. We exemplify this enhancement in a double-layer configuration that exhibits {\em perfect} (if lossless) light transmissions across a classically forbidden region, providing a simpler analog of the corresponding phenomenom in perforated metal sheets.
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http://arxiv.org/abs/1204.6209
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