Localized Plasmonic Resonances of Prolate Nanoparticles in a Symmetric Environment: Experimental Verification of the Accuracy of Numerical and Analytical Models

Mathias Kobylko (1) , Pierre-Eugène Coulon (1) , Abdallah Slablab (1) , Alexandre Fafin (2) , Julien Cardin (2) , Christian Dufour (2) , Arthur Losquin (3) , Mathieu K Kociak (3) , Isabelle Monnet (2) , Dominique Mailly (4) , Xavier Lafosse (4) , Christian Ulysse (4) , Enric Garcia-Caurel (5) , Giancarlo Rizza (1)

1 LSI - Laboratoire des Solides Irradiés - Irradiated Solids Laboratory
2 CIMAP - UMR 6252 - Centre de recherche sur les Ions, les MAtériaux et la Photonique
3 LPS - Laboratoire de Physique des Solides
4 LPN - Laboratoire de photonique et de nanostructures
5 LPICM - Laboratoire de physique des interfaces et des couches minces [Palaiseau]

We study the evolution of the surface-plasmon resonances of individual ion-beam-shaped prolate gold nanoparticles embedded in a dielectric SiO 2 environment by electron-energy-loss spectroscopy mapping in a scanning transmission electron microscope. The controlled symmetric dielectric environment obtained through the ion-beam-shaping method allows a direct quantitative comparison with numerical results obtained through simulations (auxiliary differential-equation finite-difference time-domain and boundary-element method) and with theoretical results obtained through analytical models (quasistatic model for prolate nanoellipsoids and waveguide model for infinite one-dimensional plasmonic waveguides), with which our experimental results are in very good agreement. We confirm the accuracy of state-of-the-art numerical tools and analytical theories that establish ion-beam shaping as a very promising method to design metal-dielectric nanocomposites with well-predicted optical properties, and with many possible applications in surface-enhanced Raman spectroscopy and second-harmonic generation, as well as in conventional applications of metamaterials like negative refraction, superimaging, and invisibility cloaking.

Domaines: Matériaux; Optique / photonique; Micro et nanotechnologies/Microélectronique; Matériaux; Electromagnétisme; Optique [physics.optics]; Physique Numérique [physics.comp-ph]; Science des matériaux [cond-mat.mtrl-sci]

Mathias Kobylko, Pierre-Eugène Coulon, Abdallah Slablab, Alexandre Fafin, Julien Cardin, et al.. Localized Plasmonic Resonances of Prolate Nanoparticles in a Symmetric Environment: Experimental Verification of the Accuracy of Numerical and Analytical Models. Physical Review Applied, 2018, 9 (6), ⟨10.1103/PhysRevApplied.9.064038⟩. ⟨hal-01823503⟩