Resonant plasmonic effects in periodic graphene antidot arrays

El pdf del artículo es la versión pre-print: arXiv:1206.2163v1We show that a graphene sheet perforated with micro- or nano-size antidots has prominent absorption resonances in the microwave and terahertz regions. These resonances correspond to surface plasmons of a continuous sheet perturbed by a lattice. They are excited in different diffraction orders, in contrast to cavity surface plasmon modes existing in disconnected graphene structures. The resonant absorption by the antidot array can essentially exceed the absorption by a continuous graphene sheet, even for high antidot diameter-to-period aspect ratios. Surface plasmon-enhanced absorption and suppressed transmission are more efficient for higher relaxation times of the charge carriers. © 2012 American Institute of Physics.We acknowledge support from the Spanish MECD under Contract No. MAT2009-06609-C02, FIS2008-00124, Consolider CSD2007-00010, and Consolider Project \Nanolight.es>. A.Y.N. acknowledges the Juan de la Cierva Grant No. JCI-2008-3123.Peer Reviewe