Enhancing LSPR sensitivity of Au gratings through graphene coupling to Au film - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Plasmonics Année : 2014

Enhancing LSPR sensitivity of Au gratings through graphene coupling to Au film

M. Kazan
  • Fonction : Auteur

Résumé

A particular interesting plasmonic system is that of metallic nanostructures interacting with metal films. As the localized surface plasmon resonance (LSPR) behavior of gold nanostructures (Au NPs) on the top of a gold thin film is exquisitely sensitive to the spacer distance of the film-Au NPs, we investigate in the present work the influence of a few-layered graphene spacer on the LSPR behavior of the NPs. The idea is to evidence the role of few-layered graphene as one of the thinnest possible spacer. We first show that the coupling to the Au film induces a strong lowering at around 507 nm and sharpening of the main LSPR of the Au NPs. Moreover, a blue shift in the main LSP resonance of about 13 nm is observed in the presence of a few-layered graphene spacer when compared to the case where gold nanostructures are directly linked to a gold thin film. Numerical simulations suggest that this LSP mode is dipolar and that the hot spots of the electric field are pushed to the top corners of the NPs, which makes it very sensitive to surrounding medium optical index changes and thus appealing for sensing applications. A figure of merit of such a system (gold/graphene/Au NPs) is 2.8, as compared to 2.1 for gold/Au NPs. This represents a 33 % gain in sensitivity and opens-up new sensing strategies.
Fichier principal
Vignette du fichier
1311.4633.pdf (919.16 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-00994804 , version 1 (06-07-2022)

Identifiants

Citer

Thomas Maurer, Rana Nicolas, Gaëtan Lévêque, P. Subramanian, Julien Proust, et al.. Enhancing LSPR sensitivity of Au gratings through graphene coupling to Au film. Plasmonics, 2014, 9, pp.507-512. ⟨10.1007/s11468-013-9649-0⟩. ⟨hal-00994804⟩
75 Consultations
30 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More