Plasmonic coupling in closed-packed ordered gallium nanoparticles
Entity
UAM. Departamento de Física AplicadaPublisher
Nature ResearchDate
2020-03-06Citation
10.1038/s41598-020-61090-3
Scientific Reports 10.1 (2020): 4187
ISSN
2045-2322 (online)DOI
10.1038/s41598-020-61090-3Funded by
The research is supported by the MINECO (CTQ2014-53334-C2-2-R, CTQ2017-84309-C2-2-R and MAT201676824-C3-1-R) and Comunidad de Madrid (P2018/NMT4349 and S2018/NMT-4321 NANOMAGCOST) projects. ARC acknowledges Ramón y Cajal program (under contract number RYC-2015-18047)Project
Gobierno de España. CTQ2014-53334-C2-2-R; Gobierno de España. CTQ2017-84309-C2-2-R; Gobierno de España. MAT2016- 76824-C3-1-R; Comunidad de Madrid. S2018/NMT-4321/NANOMAGCOST; Comunidad de Madrid. P2018/NMT4349/TRANSNANOAVANSENSEditor's Version
https://dx.doi.org/10.1038/s41598-020-61090-3Subjects
Plasmonics; Gallium; Aluminum; FísicaRights
© The Author(s) 2020Abstract
Plasmonic gallium (Ga) nanoparticles (NPs) are well known to exhibit good performance in numerous applications such as surface enhanced fluorescence and Raman spectroscopy or biosensing. However, to reach the optimal optical performance, the strength of the localized surface plasmon resonances (LSPRs) must be enhanced particularly by suitable narrowing the NP size distribution among other factors. With this purpose, our last work demonstrated the production of hexagonal ordered arrays of Ga NPs by using templates of aluminium (Al) shallow pit arrays, whose LSPRs were observed in the VIS region. The quantitative analysis of the optical properties by spectroscopic ellipsometry confirmed an outstanding improvement of the LSPR intensity and full width at half maximum (FWHM) due to the imposed ordering. Here, by engineering the template dimensions, and therefore by tuning Ga NPs size, we expand the LSPRs of the Ga NPs to cover a wider range of the electromagnetic spectrum from the UV to the IR regions. More interestingly, the factors that cause this optical performance improvement are studied with the universal plasmon ruler equation, supported with discrete dipole approximation simulations. The results allow us to conclude that the plasmonic coupling between NPs originated in the ordered systems is the main cause for the optimized optical response
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Google Scholar:Catalán-Gómez, S.
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Bran, C.
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Vázquez, M.
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Vázquez, L.
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Pau Vizcaíno, José Luis
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Redondo-Cubero, A.
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