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research article

Mechanisms of Fano Resonances in Coupled Plasmonic Systems

Lovera, Andrea  
•
Gallinet, Benjamin  
•
Nordlander, Peter
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2013
ACS Nano

Fano resonances in hybridized systems formed from the interaction of bright modes only are reported. Despite precedent works, we demonstrate theoretically and experimentally that Fano resonances can be obtained by destructive interference between two bright dipolar modes out of phase. A simple oscillator model is provided to predict and fit the far-field scattering. The predictions are verified with numerical calculations using a surface integral equation method for a wide range of geometrical parameters. The validity of the model Is then further demonstrated with experimental dark-field scattering measurements on actual nanostructures in the visible range. A remarkable set of properties like crossings, avoided crossings, Inversion of subradiant and superradiant modes and a plasmonic equivalent of a bound state in the continuum are presented. The nanostructure, that takes advantage of the combination of Fano resonance and nanogap effects, also shows high tunability and strong near-field enhancement. Our study provides a general understanding of Fano resonances as well as a simple tool for engineering their spectral features.

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Type
research article
DOI
10.1021/nn401175j
Web of Science ID

WOS:000319856300093

Author(s)
Lovera, Andrea  
Gallinet, Benjamin  
Nordlander, Peter
Martin, Olivier J. F.  
Date Issued

2013

Publisher

Amer Chemical Soc

Published in
ACS Nano
Volume

7

Issue

5

Start page

4527

End page

4536

Subjects

plasmonics

•

Fano resonance

•

dipole nanoantenna

•

radiation damping

•

oscillator model

•

hybridization

•

bound state in the continuum

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
NAM  
Available on Infoscience
June 11, 2013
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/92730
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