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Article

Plasmonic Circular Dichroism in Chiral Gold Nanowire Dimers

by
Daniele Toffoli
1,
Marco Medves
1,
Giovanna Fronzoni
1,
Emanuele Coccia
1,
Mauro Stener
1,*,
Luca Sementa
2 and
Alessandro Fortunelli
2,*
1
Dipartimento di Scienze Chimiche e Farmaceutiche, Università di Trieste, Via Giorgieri 1, 34127 Trieste, Italy
2
CNR-ICCOM & IPCF, Consiglio Nazionale delle Ricerche, Via Giuseppe Moruzzi 1, 56124 Pisa, Italy
*
Authors to whom correspondence should be addressed.
Molecules 2022, 27(1), 93; https://doi.org/10.3390/molecules27010093
Submission received: 17 November 2021 / Revised: 15 December 2021 / Accepted: 18 December 2021 / Published: 24 December 2021
(This article belongs to the Special Issue Synergy of Nanoparticles/Clusters Properties and Applications)
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Abstract

We report a computational study at the time-dependent density functional theory (TDDFT) level of the chiro-optical spectra of chiral gold nanowires coupled in dimers. Our goal is to explore whether it is possible to overcome destructive interference in single nanowires that damp chiral response in these systems and to achieve intense plasmonic circular dichroism (CD) through a coupling between the nanostructures. We predict a huge enhancement of circular dichroism at the plasmon resonance when two chiral nanowires are intimately coupled in an achiral relative arrangement. Such an effect is even more pronounced when two chiral nanowires are coupled in a chiral relative arrangement. Individual component maps of rotator strength, partial contributions according to the magnetic dipole component, and induced densities allow us to fully rationalize these findings, thus opening the way to the field of plasmonic CD and its rational design.
Keywords: plasmon; circular dichroism; nanoplasmonics; metal clusters plasmon; circular dichroism; nanoplasmonics; metal clusters

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MDPI and ACS Style

Toffoli, D.; Medves, M.; Fronzoni, G.; Coccia, E.; Stener, M.; Sementa, L.; Fortunelli, A. Plasmonic Circular Dichroism in Chiral Gold Nanowire Dimers. Molecules 2022, 27, 93. https://doi.org/10.3390/molecules27010093

AMA Style

Toffoli D, Medves M, Fronzoni G, Coccia E, Stener M, Sementa L, Fortunelli A. Plasmonic Circular Dichroism in Chiral Gold Nanowire Dimers. Molecules. 2022; 27(1):93. https://doi.org/10.3390/molecules27010093

Chicago/Turabian Style

Toffoli, Daniele, Marco Medves, Giovanna Fronzoni, Emanuele Coccia, Mauro Stener, Luca Sementa, and Alessandro Fortunelli. 2022. "Plasmonic Circular Dichroism in Chiral Gold Nanowire Dimers" Molecules 27, no. 1: 93. https://doi.org/10.3390/molecules27010093

APA Style

Toffoli, D., Medves, M., Fronzoni, G., Coccia, E., Stener, M., Sementa, L., & Fortunelli, A. (2022). Plasmonic Circular Dichroism in Chiral Gold Nanowire Dimers. Molecules, 27(1), 93. https://doi.org/10.3390/molecules27010093

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