Thursday, July 25, 2013

1307.6550 (Ashley M DaSilva et al.)

Photonic density of states enhancement in graphene multilayers    [PDF]

Ashley M DaSilva, You-Chia Chang, Ted Norris, Allan H MacDonald
We consider the optical properties of systems composed of a series of graphene sheets separated by thin dielectric layers. Because these systems respond as conductors to electric fields in the plane of the graphene sheets and as insulators to perpendicular electric fields, they can be expected to have properties similar to those of hyperbolic metamaterials. We show that under typical experimental conditions graphene/dielectric multilayers have enhanced Purcell factors, and enhanced photonic densities-of-states in both the THz and mid-IR frequency range. These behaviors can be traced to the coupled plasmon modes of the multi-layer graphene system.
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