FDTD simulations of localization and enhancements on fractal plasmonics nanostructures
Résumé
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.
Domaines
Autre [cond-mat.other]Origine | Fichiers produits par l'(les) auteur(s) |
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