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Title: Fano-like resonance emerging from magnetic and electric plasmon mode coupling in small arrays of gold particles

Abstract

In this work we theoretically and experimentally analyze the resonant behavior of individual 3 × 3 gold particle oligomers illuminated under normal and oblique incidence. While this structure hosts both dipolar and quadrupolar electric and magnetic delocalized modes, only dipolar electric and quadrupolar magnetic modes remain at normal incidence. These modes couple into a strongly asymmetric spectral response typical of a Fano-like resonance. In the basis of the coupled mode theory, an analytical representation of the optical extinction in terms of singular functions is used to identify the hybrid modes emerging from the electric and magnetic mode coupling and to interpret the asymmetric line profiles. Especially, we demonstrate that the characteristic Fano line shape results from the spectral interference of a broad hybrid mode with a sharp one. This structure presents a special feature in which the electric field intensity is confined on different lines of the oligomer depending on the illumination wavelength relative to the Fano dip. This Fano-type resonance is experimentally observed performing extinction cross section measurements on arrays of gold nano-disks. The vanishing of the Fano dip when increasing the incidence angle is also experimentally observed in accordance with numerical simulations.

Authors:
 [1];  [1];  [2];  [2];  [3];  [3];  [3];  [4];  [1]
  1. Univ. Lyon and CNRS, Saint-Etienne (France). Institut d'Optique Graduate School
  2. Aix-Marseille Univ. and CNRS, Marseille (France). Institut Fresnel
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Foundry
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Chemical Sciences Div.
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Univ. de Lyon, Labex Manutech-Sise; French National Research Agency (ANR)
OSTI Identifier:
1377451
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 6; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Metamaterials; Nanophotonics and plasmonics

Citation Formats

Bakhti, Saïd, Tishchenko, Alexandre V., Zambrana-Puyalto, Xavier, Bonod, Nicolas, Dhuey, Scott D., Schuck, P. James, Cabrini, Stefano, Alayoglu, Selim, and Destouches, Nathalie. Fano-like resonance emerging from magnetic and electric plasmon mode coupling in small arrays of gold particles. United States: N. p., 2016. Web. doi:10.1038/srep32061.
Bakhti, Saïd, Tishchenko, Alexandre V., Zambrana-Puyalto, Xavier, Bonod, Nicolas, Dhuey, Scott D., Schuck, P. James, Cabrini, Stefano, Alayoglu, Selim, & Destouches, Nathalie. Fano-like resonance emerging from magnetic and electric plasmon mode coupling in small arrays of gold particles. United States. doi:10.1038/srep32061.
Bakhti, Saïd, Tishchenko, Alexandre V., Zambrana-Puyalto, Xavier, Bonod, Nicolas, Dhuey, Scott D., Schuck, P. James, Cabrini, Stefano, Alayoglu, Selim, and Destouches, Nathalie. Thu . "Fano-like resonance emerging from magnetic and electric plasmon mode coupling in small arrays of gold particles". United States. doi:10.1038/srep32061. https://www.osti.gov/servlets/purl/1377451.
@article{osti_1377451,
title = {Fano-like resonance emerging from magnetic and electric plasmon mode coupling in small arrays of gold particles},
author = {Bakhti, Saïd and Tishchenko, Alexandre V. and Zambrana-Puyalto, Xavier and Bonod, Nicolas and Dhuey, Scott D. and Schuck, P. James and Cabrini, Stefano and Alayoglu, Selim and Destouches, Nathalie},
abstractNote = {In this work we theoretically and experimentally analyze the resonant behavior of individual 3 × 3 gold particle oligomers illuminated under normal and oblique incidence. While this structure hosts both dipolar and quadrupolar electric and magnetic delocalized modes, only dipolar electric and quadrupolar magnetic modes remain at normal incidence. These modes couple into a strongly asymmetric spectral response typical of a Fano-like resonance. In the basis of the coupled mode theory, an analytical representation of the optical extinction in terms of singular functions is used to identify the hybrid modes emerging from the electric and magnetic mode coupling and to interpret the asymmetric line profiles. Especially, we demonstrate that the characteristic Fano line shape results from the spectral interference of a broad hybrid mode with a sharp one. This structure presents a special feature in which the electric field intensity is confined on different lines of the oligomer depending on the illumination wavelength relative to the Fano dip. This Fano-type resonance is experimentally observed performing extinction cross section measurements on arrays of gold nano-disks. The vanishing of the Fano dip when increasing the incidence angle is also experimentally observed in accordance with numerical simulations.},
doi = {10.1038/srep32061},
journal = {Scientific Reports},
number = 1,
volume = 6,
place = {United States},
year = {Thu Sep 01 00:00:00 EDT 2016},
month = {Thu Sep 01 00:00:00 EDT 2016}
}

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Cited by: 7 works
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