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Plasmonics

, Volume 11, Issue 5, pp 1407–1416 | Cite as

Near-Field Optical Properties of Ag x Au1−x Nanoparticle Chains Embedded in a Dielectric Matrix

  • Alexandre FafinEmail author
  • Senda Yazidi
  • Sophie Camelio
  • David Babonneau
Article
  • 248 Downloads

Abstract

We study by the finite-difference time-domain method the near-field optical properties of isolated or coupled Ag x Au1−x alloy nanoparticles shallowly buried inside dielectric matrices. The optical index of alloys is obtained experimentally using spectroscopic ellipsometry measurements from multilayered thin films fabricated by ion-beam sputtering. Then, we numerically investigate the influence of the nanoparticle composition, interparticle gap and capping-layer thickness on the amplitude and spatial extent of the electric field in the vicinity of ellipsoidal nanoparticles. Our calculations provide evidence that pure metal nanoparticles (Ag or Au) exhibit a greater field enhancement associated with a larger out-of-plane extent compared to alloy nanoparticles, an effect that is even more pronounced when the optical index of surrounding matrix is increased. Moreover, we show that the optimal gap between nanoparticles to maximize the amplitude of the electric field at the capping layer/air interface results from a delicate balance, which strongly depends on the thickness of the dielectric capping layer.

Keywords

Localized surface plasmon resonance (LSPR) Ag-Au alloy nanoparticles Finite-difference time-domain method (FDTD) Near-field enhancement Hot spots 

Notes

Acknowledgments

The authors are grateful to P. Guérin for assistance during the growth of Ag x Au1−x thin films by ion-beam sputtering deposition. This work has been partially funded by the French National Agency (QMAX project no. ANR-09-NANO-031) in the frame of its 2009 programme in Nanosciences, Nanotechnologies and Nanosystems (P3N2009).

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • Alexandre Fafin
    • 1
    Email author
  • Senda Yazidi
    • 1
  • Sophie Camelio
    • 1
  • David Babonneau
    • 1
  1. 1.Institut Pprime, Département Physique et Mécanique des MatériauxUPR 3346 CNRS, Université de PoitiersFuturoscope Chasseneuil CedexFrance

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