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2014-03-19 - Article/Dans un journal avec peer-review - Anglais - 8 page(s)

Rosolen Gilles , Maes Bjorn , "Graphene ribbons for tunable coupling with plasmonic subwavelength cavities" in Journal of the Optical Society of America. B, Optical Physics, 31, 5, 1096-1102

  • Edition : Optical Society of America (DC)
  • 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) Since graphene supports low loss plasmonic guided modes in the infrared range, we theoretically investigate the coupling of these modes in patterned sheets with nano-cavities. We calculate cavity modes and (potentially critical) coupling in filter-type circuits, with resonances observed as multiple minima in the reflection spectrum. The origin and properties of the cavity modes are fully modeled by coupled mode theory, exploring for various positions of the cavity with respect to the access waveguide. A useful resonance frequency shift is examined by modifying the graphene doping (e.g. via voltage tuning). The deeply subwavelength cavity modes reach quality factors up to 42 for ribbons of 30 nm width around 5 µm wavelength. These resonances provide opportunities for ultra-compact optoelectronic circuits.