Cottom, J orcid.org/0000-0002-3480-3982, Abellan, P, Ramasse, QM orcid.org/0000-0001-7466-2283 et al. (2 more authors) (2018) Systematic Analysis of the Coupling Effects within Supported Plasmonic Nanorod Antenna Arrays. Journal of Physical Chemistry C, 122 (38). pp. 22041-22053. ISSN 1932-7447
Abstract
Vertically aligned gold nanorod arrays (of aspect ratios from 3.0 to 18.0), supported on metal substrates were fabricated by electrochemical deposition within porous anodic aluminum oxide (AAO) templates. However, the coupling effects that occur within these supported arrays are complex, involving both particle-substrate and particle-particle coupling, and far from fully understood. We have performed a systematic investigation into these effects using finite element modeling (FEM) and correlated these results to experiment. We demonstrate that within the strong coupling regime, the optical properties of the arrays are predominantly governed by inter-rod spacing. Additionally, by supporting the arrays on metal films, the absorption efficiency is significantly enhanced. We explain these coupling effects in terms of plasmon hybridization theory and image charges. We demonstrate that the longitudinal mode may be tuned throughout the visible region and present resonant wavelength contour plots as a function of inter-rod spacing and aspect ratio (AR) as an aid for the design of plasmonic arrays in applications such as photovoltaics and photocatalysis. Finally, we show that coupling within unsupported and supported arrays can redistribute the electric field to either the center or base of the nanorods respectively whilst propagating along the inter-rod axis, which is potentially of interest for optical waveguide applications.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2018 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Physical Chemistry C, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.jpcc.8b04830. Uploaded in accordance with the publisher's self-archiving policy. |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Civil Engineering (Leeds) The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds) > Molecular & Nanoscale Physics |
Funding Information: | Funder Grant number EPSRC GR/S41043/01 EPSRC EP/D040566/1 EPSRC EP/E018262/1 EPSRC EP/M028143/1 EPSRC n/a EPSRC EP/P005233/1 EPSRC Not Known Operating Account Not Known |
Depositing User: | Symplectic Publications |
Date Deposited: | 10 Sep 2018 14:57 |
Last Modified: | 30 Aug 2019 00:42 |
Status: | Published |
Publisher: | American Chemical Society |
Identification Number: | 10.1021/acs.jpcc.8b04830 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:135465 |