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Probing the plasmonic near-field by one- and two-photon excited surface enhanced Raman scattering

Strongly enhanced and spatially confined near-fields in the vicinity of plasmonic nanostructures open up exciting new capabilities for photon-driven processes and particularly also for optical spectroscopy. Surface enhanced Raman signatures of single molecules can provide us with important informati...

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Detalles Bibliográficos
Autores principales: Kneipp, Katrin, Kneipp, Harald
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Beilstein-Institut 2013
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3869247/
https://www.ncbi.nlm.nih.gov/pubmed/24367752
http://dx.doi.org/10.3762/bjnano.4.94
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author Kneipp, Katrin
Kneipp, Harald
author_facet Kneipp, Katrin
Kneipp, Harald
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description Strongly enhanced and spatially confined near-fields in the vicinity of plasmonic nanostructures open up exciting new capabilities for photon-driven processes and particularly also for optical spectroscopy. Surface enhanced Raman signatures of single molecules can provide us with important information about the optical near-field. We discuss one- and two-photon excited surface enhanced Raman scattering at the level of single molecules as a tool for probing the plasmonic near-field of silver nanoaggregates. The experiments reveal enhancement factors of local fields in the hottest hot spots of the near-field and their dependence on the photon energy. Also, the number of the hottest spots and their approximate geometrical size are found. Near-field amplitudes in the hottest spots can be enhanced by three orders of magnitudes. Nanoaggregates of 100 nm dimensions provide one hot spot on this highest enhancement level where the enhancement is confined within less than 1nm dimension. The near-field enhancement in the hottest spots increases with decreasing photon energy.
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spelling pubmed-38692472013-12-23 Probing the plasmonic near-field by one- and two-photon excited surface enhanced Raman scattering Kneipp, Katrin Kneipp, Harald Beilstein J Nanotechnol Full Research Paper Strongly enhanced and spatially confined near-fields in the vicinity of plasmonic nanostructures open up exciting new capabilities for photon-driven processes and particularly also for optical spectroscopy. Surface enhanced Raman signatures of single molecules can provide us with important information about the optical near-field. We discuss one- and two-photon excited surface enhanced Raman scattering at the level of single molecules as a tool for probing the plasmonic near-field of silver nanoaggregates. The experiments reveal enhancement factors of local fields in the hottest hot spots of the near-field and their dependence on the photon energy. Also, the number of the hottest spots and their approximate geometrical size are found. Near-field amplitudes in the hottest spots can be enhanced by three orders of magnitudes. Nanoaggregates of 100 nm dimensions provide one hot spot on this highest enhancement level where the enhancement is confined within less than 1nm dimension. The near-field enhancement in the hottest spots increases with decreasing photon energy. Beilstein-Institut 2013-12-02 /pmc/articles/PMC3869247/ /pubmed/24367752 http://dx.doi.org/10.3762/bjnano.4.94 Text en Copyright © 2013, Kneipp and Kneipp https://creativecommons.org/licenses/by/2.0https://www.beilstein-journals.org/bjnano/termsThis is an Open Access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The license is subject to the Beilstein Journal of Nanotechnology terms and conditions: (https://www.beilstein-journals.org/bjnano/terms)
spellingShingle Full Research Paper
Kneipp, Katrin
Kneipp, Harald
Probing the plasmonic near-field by one- and two-photon excited surface enhanced Raman scattering
title Probing the plasmonic near-field by one- and two-photon excited surface enhanced Raman scattering
title_full Probing the plasmonic near-field by one- and two-photon excited surface enhanced Raman scattering
title_fullStr Probing the plasmonic near-field by one- and two-photon excited surface enhanced Raman scattering
title_full_unstemmed Probing the plasmonic near-field by one- and two-photon excited surface enhanced Raman scattering
title_short Probing the plasmonic near-field by one- and two-photon excited surface enhanced Raman scattering
title_sort probing the plasmonic near-field by one- and two-photon excited surface enhanced raman scattering
topic Full Research Paper
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3869247/
https://www.ncbi.nlm.nih.gov/pubmed/24367752
http://dx.doi.org/10.3762/bjnano.4.94
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