Tunable light-matter interaction and the role of hyperbolicity in graphene-hbn system

Anshuman Kumar, Tony Low, Kin Hung Fung, Phaedon Avouris, Nicholas X. Fang

Research output: Contribution to journalArticlepeer-review

167 Scopus citations

Abstract

Hexagonal boron nitride (hBN) is a natural hyperbolic material, which can also accommodate highly dispersive surface phonon-polariton modes. In this paper, we examine theoretically the mid-infrared optical properties of graphene-hBN heterostructures derived from their coupled plasmon-phonon modes. We find that the graphene plasmon couples differently with the phonons of the two Reststrahlen bands, owing to their different hyperbolicity. This also leads to distinctively different interaction between an external quantum emitter and the plasmon-phonon modes in the two bands, leading to substantial modification of its spectrum. The coupling to graphene plasmons allows for additional gate tunability in the Purcell factor and narrow dips in its emission spectra.

Original languageEnglish (US)
Pages (from-to)3172-3180
Number of pages9
JournalNano letters
Volume15
Issue number5
DOIs
StatePublished - May 13 2015

Keywords

  • Plasmonics
  • graphene
  • hBN
  • hyperbolic metamaterials
  • phonons

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