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Article

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

by
Niloofar Ebrahimzadeh Esfahani
*,
Jaroslav Kováč, Jr.
*,
Soňa Kováčová
and
Martin Feiler
Faculty of Electrical Engineering and Information, Slovak University of Technology, Ilkovicova 3, 81219 Bratislava, Slovakia
*
Authors to whom correspondence should be addressed.
Photonics 2023, 10(1), 78; https://doi.org/10.3390/photonics10010078
Submission received: 11 December 2022 / Revised: 1 January 2023 / Accepted: 5 January 2023 / Published: 10 January 2023
(This article belongs to the Section Lasers, Light Sources and Sensors)

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.
Keywords: plasmonic properties; ultrathin oxide layer; metallic nanostructures; gold NPs; film-coupled NPs plasmonic properties; ultrathin oxide layer; metallic nanostructures; gold NPs; film-coupled NPs

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MDPI and ACS Style

Ebrahimzadeh Esfahani, N.; Kováč, J., Jr.; Kováčová, S.; Feiler, M. Plasmonic Properties of the Metal Nanoparticles (NPs) on a Metal Mirror Separated by an Ultrathin Oxide Layer. Photonics 2023, 10, 78. https://doi.org/10.3390/photonics10010078

AMA Style

Ebrahimzadeh Esfahani N, Kováč J Jr., Kováčová S, Feiler M. Plasmonic Properties of the Metal Nanoparticles (NPs) on a Metal Mirror Separated by an Ultrathin Oxide Layer. Photonics. 2023; 10(1):78. https://doi.org/10.3390/photonics10010078

Chicago/Turabian Style

Ebrahimzadeh Esfahani, Niloofar, Jaroslav Kováč, Jr., Soňa Kováčová, and Martin Feiler. 2023. "Plasmonic Properties of the Metal Nanoparticles (NPs) on a Metal Mirror Separated by an Ultrathin Oxide Layer" Photonics 10, no. 1: 78. https://doi.org/10.3390/photonics10010078

APA Style

Ebrahimzadeh Esfahani, N., Kováč, J., Jr., Kováčová, S., & Feiler, M. (2023). Plasmonic Properties of the Metal Nanoparticles (NPs) on a Metal Mirror Separated by an Ultrathin Oxide Layer. Photonics, 10(1), 78. https://doi.org/10.3390/photonics10010078

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