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Metal-Enhanced Fluorescence of Silver Island Associated with Silver Nanoparticle

The coupling plasmon of a hybrid nanostructure, silver island (SI) associated with silver nanoparticle (SNP), on metal-enhanced fluorescence (MEF) was studied theoretically. We used the multiple multipole method to analyze the plasmon-mediated enhancement factor on the fluorescence of a molecule imm...

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Autores principales: Liaw, Jiunn-Woei, Wu, Hsin-Yu, Huang, Chu-Chuan, Kuo, Mao-Kuen
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer US 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4715017/
https://www.ncbi.nlm.nih.gov/pubmed/26779917
http://dx.doi.org/10.1186/s11671-016-1247-6
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author Liaw, Jiunn-Woei
Wu, Hsin-Yu
Huang, Chu-Chuan
Kuo, Mao-Kuen
author_facet Liaw, Jiunn-Woei
Wu, Hsin-Yu
Huang, Chu-Chuan
Kuo, Mao-Kuen
author_sort Liaw, Jiunn-Woei
collection PubMed
description The coupling plasmon of a hybrid nanostructure, silver island (SI) associated with silver nanoparticle (SNP), on metal-enhanced fluorescence (MEF) was studied theoretically. We used the multiple multipole method to analyze the plasmon-mediated enhancement factor on the fluorescence of a molecule immobilized on SNP and located in the gap zone between SI and SNP; herein, the SI was modeled as an oblate spheroid. Numerical results show that the enhancement factor of the hybrid nanostructure is higher than that of a SNP or a SI alone due to the coupled gap mode. This finding is in agreement with the previous experimental results. In addition, the plasmon band of the structure is broadband and tunable, which can be red-shifted and broadened by flattening or enlarging SI. Based on this property, the hybrid nanostructure can be tailored to obtain the optimal enhancement factor on a specific molecule according to its excitation spectrum. Moreover, we found that there is an induced optical force allowing SNP be attracted by SI. Consequently, the gap is reduced gradually to perform a stronger MEF effect.
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spelling pubmed-47150172016-01-31 Metal-Enhanced Fluorescence of Silver Island Associated with Silver Nanoparticle Liaw, Jiunn-Woei Wu, Hsin-Yu Huang, Chu-Chuan Kuo, Mao-Kuen Nanoscale Res Lett Nano Express The coupling plasmon of a hybrid nanostructure, silver island (SI) associated with silver nanoparticle (SNP), on metal-enhanced fluorescence (MEF) was studied theoretically. We used the multiple multipole method to analyze the plasmon-mediated enhancement factor on the fluorescence of a molecule immobilized on SNP and located in the gap zone between SI and SNP; herein, the SI was modeled as an oblate spheroid. Numerical results show that the enhancement factor of the hybrid nanostructure is higher than that of a SNP or a SI alone due to the coupled gap mode. This finding is in agreement with the previous experimental results. In addition, the plasmon band of the structure is broadband and tunable, which can be red-shifted and broadened by flattening or enlarging SI. Based on this property, the hybrid nanostructure can be tailored to obtain the optimal enhancement factor on a specific molecule according to its excitation spectrum. Moreover, we found that there is an induced optical force allowing SNP be attracted by SI. Consequently, the gap is reduced gradually to perform a stronger MEF effect. Springer US 2016-01-16 /pmc/articles/PMC4715017/ /pubmed/26779917 http://dx.doi.org/10.1186/s11671-016-1247-6 Text en © Liaw et al. 2016 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
spellingShingle Nano Express
Liaw, Jiunn-Woei
Wu, Hsin-Yu
Huang, Chu-Chuan
Kuo, Mao-Kuen
Metal-Enhanced Fluorescence of Silver Island Associated with Silver Nanoparticle
title Metal-Enhanced Fluorescence of Silver Island Associated with Silver Nanoparticle
title_full Metal-Enhanced Fluorescence of Silver Island Associated with Silver Nanoparticle
title_fullStr Metal-Enhanced Fluorescence of Silver Island Associated with Silver Nanoparticle
title_full_unstemmed Metal-Enhanced Fluorescence of Silver Island Associated with Silver Nanoparticle
title_short Metal-Enhanced Fluorescence of Silver Island Associated with Silver Nanoparticle
title_sort metal-enhanced fluorescence of silver island associated with silver nanoparticle
topic Nano Express
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4715017/
https://www.ncbi.nlm.nih.gov/pubmed/26779917
http://dx.doi.org/10.1186/s11671-016-1247-6
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