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Unveiling the radiative local density of optical states of a plasmonic nanocavity by STM
Atomically-sharp tips in close proximity of metal surfaces create plasmonic nanocavities supporting both radiative (bright) and non-radiative (dark) localized surface plasmon modes. Disentangling their respective contributions to the total density of optical states remains a challenge. Electrolumine...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7039974/ https://www.ncbi.nlm.nih.gov/pubmed/32094339 http://dx.doi.org/10.1038/s41467-020-14827-7 |
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author | Martín-Jiménez, Alberto Fernández-Domínguez, Antonio I. Lauwaet, Koen Granados, Daniel Miranda, Rodolfo García-Vidal, Francisco J. Otero, Roberto |
author_facet | Martín-Jiménez, Alberto Fernández-Domínguez, Antonio I. Lauwaet, Koen Granados, Daniel Miranda, Rodolfo García-Vidal, Francisco J. Otero, Roberto |
author_sort | Martín-Jiménez, Alberto |
collection | PubMed |
description | Atomically-sharp tips in close proximity of metal surfaces create plasmonic nanocavities supporting both radiative (bright) and non-radiative (dark) localized surface plasmon modes. Disentangling their respective contributions to the total density of optical states remains a challenge. Electroluminescence due to tunnelling through the tip-substrate gap could allow the identification of the radiative component, but this information is inherently convoluted with that of the electronic structure of the system. In this work, we present a fully experimental procedure to eliminate the electronic-structure factors from the scanning tunnelling microscope luminescence spectra by confronting them with spectroscopic information extracted from elastic current measurements. Comparison against electromagnetic calculations demonstrates that this procedure allows the characterization of the meV shifts experienced by the nanocavity plasmonic modes under atomic-scale gap size changes. Therefore, the method gives access to the frequency-dependent radiative Purcell enhancement that a microscopic light emitter would undergo when placed at such nanocavity. |
format | Online Article Text |
id | pubmed-7039974 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-70399742020-03-04 Unveiling the radiative local density of optical states of a plasmonic nanocavity by STM Martín-Jiménez, Alberto Fernández-Domínguez, Antonio I. Lauwaet, Koen Granados, Daniel Miranda, Rodolfo García-Vidal, Francisco J. Otero, Roberto Nat Commun Article Atomically-sharp tips in close proximity of metal surfaces create plasmonic nanocavities supporting both radiative (bright) and non-radiative (dark) localized surface plasmon modes. Disentangling their respective contributions to the total density of optical states remains a challenge. Electroluminescence due to tunnelling through the tip-substrate gap could allow the identification of the radiative component, but this information is inherently convoluted with that of the electronic structure of the system. In this work, we present a fully experimental procedure to eliminate the electronic-structure factors from the scanning tunnelling microscope luminescence spectra by confronting them with spectroscopic information extracted from elastic current measurements. Comparison against electromagnetic calculations demonstrates that this procedure allows the characterization of the meV shifts experienced by the nanocavity plasmonic modes under atomic-scale gap size changes. Therefore, the method gives access to the frequency-dependent radiative Purcell enhancement that a microscopic light emitter would undergo when placed at such nanocavity. Nature Publishing Group UK 2020-02-24 /pmc/articles/PMC7039974/ /pubmed/32094339 http://dx.doi.org/10.1038/s41467-020-14827-7 Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Martín-Jiménez, Alberto Fernández-Domínguez, Antonio I. Lauwaet, Koen Granados, Daniel Miranda, Rodolfo García-Vidal, Francisco J. Otero, Roberto Unveiling the radiative local density of optical states of a plasmonic nanocavity by STM |
title | Unveiling the radiative local density of optical states of a plasmonic nanocavity by STM |
title_full | Unveiling the radiative local density of optical states of a plasmonic nanocavity by STM |
title_fullStr | Unveiling the radiative local density of optical states of a plasmonic nanocavity by STM |
title_full_unstemmed | Unveiling the radiative local density of optical states of a plasmonic nanocavity by STM |
title_short | Unveiling the radiative local density of optical states of a plasmonic nanocavity by STM |
title_sort | unveiling the radiative local density of optical states of a plasmonic nanocavity by stm |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7039974/ https://www.ncbi.nlm.nih.gov/pubmed/32094339 http://dx.doi.org/10.1038/s41467-020-14827-7 |
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