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Theory of tailorable optical response of two-dimensional arrays of plasmonic nanoparticles at dielectric interfaces

Two-dimensional arrays of plasmonic nanoparticles at interfaces are promising candidates for novel optical metamaterials. Such systems materialise from ‘top–down’ patterning or ‘bottom–up’ self-assembly of nanoparticles at liquid/liquid or liquid/solid interfaces. Here, we present a comprehensive an...

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Detalles Bibliográficos
Autores principales: Sikdar, Debabrata, Kornyshev, Alexei A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5031966/
https://www.ncbi.nlm.nih.gov/pubmed/27652788
http://dx.doi.org/10.1038/srep33712
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author Sikdar, Debabrata
Kornyshev, Alexei A.
author_facet Sikdar, Debabrata
Kornyshev, Alexei A.
author_sort Sikdar, Debabrata
collection PubMed
description Two-dimensional arrays of plasmonic nanoparticles at interfaces are promising candidates for novel optical metamaterials. Such systems materialise from ‘top–down’ patterning or ‘bottom–up’ self-assembly of nanoparticles at liquid/liquid or liquid/solid interfaces. Here, we present a comprehensive analysis of an extended effective quasi-static four-layer-stack model for the description of plasmon-resonance-enhanced optical responses of such systems. We investigate in detail the effects of the size of nanoparticles, average interparticle separation, dielectric constants of the media constituting the interface, and the nanoparticle position relative to the interface. Interesting interplays of these different factors are explored first for normally incident light. For off-normal incidence, the strong effects of the polarisation of light are found at large incident angles, which allows to dynamically tune the reflectance spectra. All the predictions of the theory are tested against full-wave simulations, proving this simplistic model to be adequate within the quasi-static limit. The model takes seconds to calculate the system’s optical response and makes it easy to unravel the effect of each system parameter. This helps rapid rationalization of experimental data and understanding of the optical signals from these novel ‘metamaterials’, optimised for light reflection or harvesting.
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spelling pubmed-50319662016-09-29 Theory of tailorable optical response of two-dimensional arrays of plasmonic nanoparticles at dielectric interfaces Sikdar, Debabrata Kornyshev, Alexei A. Sci Rep Article Two-dimensional arrays of plasmonic nanoparticles at interfaces are promising candidates for novel optical metamaterials. Such systems materialise from ‘top–down’ patterning or ‘bottom–up’ self-assembly of nanoparticles at liquid/liquid or liquid/solid interfaces. Here, we present a comprehensive analysis of an extended effective quasi-static four-layer-stack model for the description of plasmon-resonance-enhanced optical responses of such systems. We investigate in detail the effects of the size of nanoparticles, average interparticle separation, dielectric constants of the media constituting the interface, and the nanoparticle position relative to the interface. Interesting interplays of these different factors are explored first for normally incident light. For off-normal incidence, the strong effects of the polarisation of light are found at large incident angles, which allows to dynamically tune the reflectance spectra. All the predictions of the theory are tested against full-wave simulations, proving this simplistic model to be adequate within the quasi-static limit. The model takes seconds to calculate the system’s optical response and makes it easy to unravel the effect of each system parameter. This helps rapid rationalization of experimental data and understanding of the optical signals from these novel ‘metamaterials’, optimised for light reflection or harvesting. Nature Publishing Group 2016-09-22 /pmc/articles/PMC5031966/ /pubmed/27652788 http://dx.doi.org/10.1038/srep33712 Text en Copyright © 2016, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Sikdar, Debabrata
Kornyshev, Alexei A.
Theory of tailorable optical response of two-dimensional arrays of plasmonic nanoparticles at dielectric interfaces
title Theory of tailorable optical response of two-dimensional arrays of plasmonic nanoparticles at dielectric interfaces
title_full Theory of tailorable optical response of two-dimensional arrays of plasmonic nanoparticles at dielectric interfaces
title_fullStr Theory of tailorable optical response of two-dimensional arrays of plasmonic nanoparticles at dielectric interfaces
title_full_unstemmed Theory of tailorable optical response of two-dimensional arrays of plasmonic nanoparticles at dielectric interfaces
title_short Theory of tailorable optical response of two-dimensional arrays of plasmonic nanoparticles at dielectric interfaces
title_sort theory of tailorable optical response of two-dimensional arrays of plasmonic nanoparticles at dielectric interfaces
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5031966/
https://www.ncbi.nlm.nih.gov/pubmed/27652788
http://dx.doi.org/10.1038/srep33712
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