Enhancement of photonic density of states in finite graphene multilayers

Ashley M. Dasilva*, You-Chia Chang, Ted Norris, Allan H. Macdonald

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

We consider the optical properties of finite 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 terahertz (THz) and midinfrared (mid-IR) frequency range. These behaviors can be traced to the coupled plasmon modes of the multilayer graphene system. We show that these results can be obtained with just a few layers of graphene.

Original languageEnglish
Article number195411
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume88
Issue number19
DOIs
StatePublished - 13 Nov 2013

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