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

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep32061· OSTI ID:1377451
 [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.
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.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
French National Research Agency (ANR); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Univ. de Lyon, Labex Manutech-Sise
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1377451
Journal Information:
Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 6; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (10)

Fano-resonances in High Index Dielectric Nanowires for Directional Scattering book January 2018
CELES: CUDA-accelerated simulation of electromagnetic scattering by large ensembles of spheres journal September 2017
Optical Magnetic Multipolar Resonances in Large Dynamic Metamolecules journal July 2021
Fano resonance with high local field enhancement under azimuthally polarized excitation journal April 2017
Fano resonances based on plasmonic square resonator with high figure of merits and its application in glucose concentrations sensing journal August 2019
Tuning plasmons layer-by-layer for quantitative colloidal sensing with surface-enhanced Raman spectroscopy journal January 2018
Double Fano resonances and electromagnetically induced transparency-like optical response achieved by breaking the symmetry of two double-split rings journal May 2019
Manipulation of multiple magnetic Fano resonances in nonconcentric asymmetric ring-ring nanostructure journal February 2018
Breaking the symmetry to manipulate the magnetic Fano resonance in double split ring/square ring structure journal July 2018
The generation of multiple electric and magnetic Fano resonances in the prefect ring-triple arcs ring nanostructure journal April 2019

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