Strong and weak polarization-dependent interactions in connected and disconnected plasmonic nanostructures
Damien Eschimèse
(1)
,
François Vaurette
(2, 1)
,
Céline Ha
(1)
,
Steve Arscott
(3)
,
Thierry Mélin
(4)
,
Gaëtan Lévêque
(4)
François Vaurette
- Fonction : Auteur
- PersonId : 743128
- IdHAL : francois-vaurette
- ORCID : 0000-0002-6850-0242
- IdRef : 123805848
Steve Arscott
- Fonction : Auteur
- PersonId : 739879
- IdHAL : stevearscott
- ORCID : 0000-0001-9938-2683
- IdRef : 144910691
Thierry Mélin
- Fonction : Auteur
- PersonId : 744412
- IdHAL : thierry-melin
- IdRef : 11444756X
Gaëtan Lévêque
- Fonction : Auteur
- PersonId : 752691
- IdHAL : gaetan-leveque
- ORCID : 0000-0003-1626-8207
- IdRef : 080646158
Résumé
We explore numerically and experimentally the formation of hybridized modes between a bright mode displayed by a gold nanodisc and either dark or bright modes of a nanorod – both elements being either separated by a nanometer-size gap (disconnected system) or relied on a metal junction (connected system). In terms of modeling, we compare the scattering or absorption spectra and field distributions obtained under oblique-incidence plane wave illumination with quasi-normal mode computation and an analytical model based on a coupled oscillator model. Both connected and disconnected systems have very different plasmon properties in longitudinal polarization. The disconnected system can be consistently understood in terms of the nature of hybridized modes and coupling strength using either QNMs or coupled oscillator model; however the connected configuration presents intriguing peculiarities based on the strong redistribution of charges implied by the presence of the metal connection. In practice, the fabrication of disconnected or connected configurations depends on the mitigation of lithographic proximity effects inherent to top-down lithography methods, which can lead to the formation of small metal junctions, while careful lithographic dosing allows one to fabricate disconnected systems with a gap as low as 20 nm. We obtained a very good agreement between experimentally measured scattering spectra and numerical predictions. The methods and analyses presented in this work can be applied to a wide range of systems, for potential applications in light–matter interactions, biosensing or strain monitoring.
Format du dépôt | Fichier |
---|---|
Type de dépôt | Article dans une revue |
Titre |
en
Strong and weak polarization-dependent interactions in connected and disconnected plasmonic nanostructures
|
Résumé |
en
We explore numerically and experimentally the formation of hybridized modes between a bright mode displayed by a gold nanodisc and either dark or bright modes of a nanorod – both elements being either separated by a nanometer-size gap (disconnected system) or relied on a metal junction (connected system). In terms of modeling, we compare the scattering or absorption spectra and field distributions obtained under oblique-incidence plane wave illumination with quasi-normal mode computation and an analytical model based on a coupled oscillator model. Both connected and disconnected systems have very different plasmon properties in longitudinal polarization. The disconnected system can be consistently understood in terms of the nature of hybridized modes and coupling strength using either QNMs or coupled oscillator model; however the connected configuration presents intriguing peculiarities based on the strong redistribution of charges implied by the presence of the metal connection. In practice, the fabrication of disconnected or connected configurations depends on the mitigation of lithographic proximity effects inherent to top-down lithography methods, which can lead to the formation of small metal junctions, while careful lithographic dosing allows one to fabricate disconnected systems with a gap as low as 20 nm. We obtained a very good agreement between experimentally measured scattering spectra and numerical predictions. The methods and analyses presented in this work can be applied to a wide range of systems, for potential applications in light–matter interactions, biosensing or strain monitoring.
|
Auteur(s) |
Damien Eschimèse
1
, François Vaurette
2, 1
, Céline Ha
1
, Steve Arscott
3
, Thierry Mélin
4
, Gaëtan Lévêque
4
1
IEMN -
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520
( 1066983 )
- [Univ. Lille, CNRS, Centrale Lille Institut, Junia, Univ. Polytechnique Hauts-de-France] ––
Laboratoire Central – Cité Scientifique – Avenue Poincaré – CS 60069 – 59652 VILLENEUVE D’ASCQ CEDEX
- France
2
CMNF - IEMN -
Centrale de Micro Nano Fabrication - IEMN
( 1067406 )
- Groupe Centrale de Micro Nano Fabrication CMNF - IEMN UMR8520 -
Membre du réseau RENATECH des grandes centrales de Micro Nano Fabrication
- France
3
NAM6 - IEMN -
Nano and Microsystems - IEMN
( 1066996 )
- Groupe NAM6 - (Micro et Nano Systèmes) - IEMN UMR8520
- France
4
PHYSIQUE - IEMN -
Physique - IEMN
( 1067373 )
- Groupe Physique - (Physics group) - IEMN UMR8520
- France
|
Licence |
Paternité
|
Langue du document |
Anglais
|
Vulgarisation |
Non
|
Comité de lecture |
Oui
|
Audience |
Internationale
|
Date de publication électronique |
2022-01-10
|
Page/Identifiant |
1173-1181
|
Volume |
4
|
Nom de la revue |
|
Date de publication |
2022-01-10
|
Financement |
|
Domaine(s) |
|
Collaboration/Projet |
|
Projet(s) ANR |
|
DOI | 10.1039/D1NA00620G |
UT key WOS | 000746912700001 |
Origine :
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