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  4. Mode Evolution in Strongly Coupled Plasmonic Dolmens Fabricated by Templated Assembly
 
research article

Mode Evolution in Strongly Coupled Plasmonic Dolmens Fabricated by Templated Assembly

Flauraud, Valentin  
•
Bernasconi, Gabriel D.
•
Butet, Jeremy
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2017
ACS Photonics

Plasmonic antennas have enabled a wealth of applications that exploit tailored near-fields and radiative properties, further endowed by the bespoke interactions of multiple resonant building blocks. Specifically, when the interparticle distances are reduced to a few nanometers, coupling may be greatly enhanced leading to ultimate near-field intensities and confinement along with a large energy splitting of resonant modes. While this concept is well-known, the fabrication and characterization of suitable multimers with controlled geometries and few-nanometer gaps remains highly challenging. In this article, we present the topographically templated assembly of single-crystal colloidal gold nanorods into trimers, with a dolmen geometry. This fabrication method enables the precise positioning of high-quality nanorods, with gaps as small as 1.5 nm, which permits a gradual and controlled symmetry breaking by tuning the arrangement of these strongly coupled nanostructures. To characterize the fabricated structures, we perform electron energy loss spectroscopy (EELS) near-field hyperspectral imaging and geometrically accurate EELS, plane wave, and eigenmode full-wave computations to reveal the principles governing the electromagnetic response of such nanostructures that have been extensively studied under plane wave excitation for their Fano resonant properties. These experiments track the evolution of the multipolar interactions with high accuracy as the antenna geometry varies. Our results provide new insights in strongly coupled single-crystal building blocks and open news opportunities for the design and fabrication of plasmonic systems.

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Type
research article
DOI
10.1021/acsphotonics.6b01026
Web of Science ID

WOS:000406174600013

Author(s)
Flauraud, Valentin  
Bernasconi, Gabriel D.
Butet, Jeremy
Mastrangeli, Massimo  
Alexander, Duncan T. L.  
Martin, Olivier J. F.  
Brugger, Jürgen
Date Issued

2017

Published in
ACS Photonics
Volume

4

Issue

7

Start page

1661

End page

1668

Subjects

capillary assembly

•

eigenmodes

•

electron energy loss spectroscopy

•

nanoantennas

•

nanoparticles

•

plasmonic dolmen

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

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NAM  
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Available on Infoscience
August 22, 2017
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/139800
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