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Plasmonic Properties of the Metal Nanoparticles (NPs) on a Metal Mirror Separated by an Ultrathin Oxide Layer

Authors :
Niloofar Ebrahimzadeh Esfahani
Jaroslav Kováč
Soňa Kováčová
Martin Feiler
Source :
Photonics, Vol 10, Iss 1, p 78 (2023)
Publication Year :
2023
Publisher :
MDPI AG, 2023.

Abstract

The plasmonic resonance frequency of metal nanoparticles (NPs) strongly depend on the geometry, size, and separation between NPs. Here, a plasmonic structure is designed based on a film-coupled nanoparticle phenomenon and analytically investigated by a finite element method via COMSOL Multiphysics software tool. The optical behavior of the designed structure is studied and compared for two noble metals (gold and silver as a case study). Simulation results confirmed that structural elements such as dielectric layer thickness, metal film thickness, and metal nanoparticle separation distance significantly affect the plasmonic properties. Consequently, optimizing the dimensions of the mentioned structural elements results in a strong field enhancement in the dielectric gap layer. The simplicity of this structure, easy controlling of the dielectric gap layer thickness, strong field confinement in a limited area, and lack of incident light angle tunning are characteristic features of the proposed structure. Strong field enhancement in a limited volume makes this structure promising as plasmonic nanoantennas, SERS platforms, and sensing applications.

Details

Language :
English
ISSN :
23046732 and 92076890
Volume :
10
Issue :
1
Database :
Directory of Open Access Journals
Journal :
Photonics
Publication Type :
Academic Journal
Accession number :
edsdoj.8f92076890b647ee9cd86822f6efc86e
Document Type :
article
Full Text :
https://doi.org/10.3390/photonics10010078