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2014-12-13 - Article/Dans un journal avec peer-review - Anglais - 6 page(s)

Rosolen Gilles , Maes Bjorn , "Nonuniform doping of graphene for plasmonic tapers" in Journal of Optics, 17, 1, 015002-015008

  • Edition : Institute of Physics (IOP)
  • Codes CREF : Matériaux optiques (DI1256)
  • Unités de recherche UMONS : Matériaux Micro et Nanophotoniques (S803)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)
  • Centres UMONS : Physique des matériaux (CRPM)
Texte intégral :

Abstract(s) :

(Anglais) A numerical study of graphene plasmons (GPs) propagating along various doping profiles of the graphene sheet is proposed. We show that the GP reflection at an abrupt doping interface is a simple function of the doping difference, consistent with a Fresnel model. In addition, improved transmission is obtained with a tapered interface and we find an optimal size for the transition zone. By considering localized inhomogeneities we describe a Fabry–Perot type cavity leading to an absorption above 60%. Furthermore, an alternative design of a 6 nm length cavity is proposed achieving 100% absorption. These results may lead to novel optical switches, circuits or nano-sensors.