Plasmonics

, Volume 8, Issue 4, pp 1691–1698 | Cite as

Search of Extremely Sensitive Near-Infrared Plasmonic Interfaces: A Theoretical Study

  • Ophélie Saison-Francioso
  • Gaëtan Lévêque
  • Abdellatif Akjouj
  • Yan Pennec
  • Bahram Djafari-Rouhani
  • Rabah Boukherroub
  • Sabine Szunerits
Article

Abstract

The sensitivity of the wavelength position of localized surface plasmon resonance (LSPR) in metal nanostructures to local changes in the refractive index has been widely used for label-free detection strategies. Tuning the optical properties of the nanostructures from the visible to the infrared region is expected to have a drastic effect on the refractive index sensitivity. Here, we theoretically investigate the optical response of a newly designed plasmonic interface to changes in the bulk refractive index by the finite difference time domain method. It consists of a structured interface, where the planar interface is superposed with dielectric pillars 30 nm in height and 125 nm in length with a separation distance of 15 nm. The pillars are covered with U-shaped gold nanostructures of 50 nm in height, 125 nm in length, and 5 nm of gold base thickness. The whole structure is finally covered with a 5-nm thick dielectric layer of n2 = 2.63. This plasmonic structure shows bulk refractive index sensitivities up to 1750 nm/RIU (RIU : refractive index unit) in the near infrared (λ = 2621 nm). The enhanced sensitivity is a consequence of the extremely enhanced electrical field between the gold nanopillars of the plasmonic interface.

Keywords

Localized surface plasmon resonance 2D grating structures Gold nanostructures Near infrared Dielectric layers Coating Lorentz–Drude model 

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Ophélie Saison-Francioso
    • 1
    • 2
  • Gaëtan Lévêque
    • 2
  • Abdellatif Akjouj
    • 2
  • Yan Pennec
    • 2
  • Bahram Djafari-Rouhani
    • 2
  • Rabah Boukherroub
    • 1
    • 2
  • Sabine Szunerits
    • 1
  1. 1.Institut de Recherche Interdisciplinaire (IRI, USR-3078)Université Lille 1, Parc de la Haute BorneVilleneuve d’AscqFrance
  2. 2.Institut d’Electronique, de Microélectronique et de Nanotechnologie (IEMN)UMR-CNRS 8520, Université Lille 1, Cité ScientifiqueVilleneuve d’AscqFrance

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