FDTD simulations of localization and enhancements on fractal plasmonics nanostructures.
A parallelized 3D FDTD (Finite-Difference Time-Domain) solver has been used to study the near-field electromagnetic intensity upon plasmonics nanostructures. The studied structures are obtained from AFM (Atomic Force Microscopy) topography measured on real disordered gold layers deposited by thermal evaporation under ultra-high vacuum. The simulation results obtained with these 3D metallic nanostructures are in good agreement with previous experimental results: the localization of the electromagnetic intensity in subwavelength areas ("hot spots") is demonstrated; the spectral and polarization dependences of the position of these "hot spots" are also satisfactory; the enhancement factors obtained are realistic compared to the experimental ones. These results could be useful to further our understanding of the electromagnetic behavior of random metal layers.
Groupe d’Etudes de la Matière Condensée, Université de Versailles Saint-Quentin, CNRS UMR 8635, 45 avenue des Etats-Unis, F-78035 Versailles cedex, France.
Stéphanie
S
Buil
Julien
J
Laverdant
Bruno
B
Berini
Pierre
P
Maso
Jean-Pierre
JP
Hermier
Xavier
X
Quélin
D003198:Computer Simulation; D004574:Electromagnetic Fields; D017709:Fractals; D008027:Light; D008956:Models, Chemical; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D012542:Scattering, Radiation; D020349:Surface Plasmon Resonance / Q000379:methods*