Anapole-assisted giant electric field enhancement for surface-enhanced coherent anti-Stokes Raman spectroscopy

Abstract The coherent anti-Stokes Raman spectroscopy (CARS) techniques are recognized for their ability to detect and identify vibrational coherent processes down to the single-molecular levels. Plasmonic oligomers supporting full-range Fano-like line profiles in their scattering spectrum are one of...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Maryam Ghahremani, Mojtaba Karimi Habil, Carlos J. Zapata-Rodriguez
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/e09b2f9394d44b2abfd28705f0b5c23c
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:e09b2f9394d44b2abfd28705f0b5c23c
record_format	dspace
spelling	oai:doaj.org-article:e09b2f9394d44b2abfd28705f0b5c23c2021-12-02T16:51:26ZAnapole-assisted giant electric field enhancement for surface-enhanced coherent anti-Stokes Raman spectroscopy10.1038/s41598-021-90061-52045-2322https://doaj.org/article/e09b2f9394d44b2abfd28705f0b5c23c2021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-90061-5https://doaj.org/toc/2045-2322Abstract The coherent anti-Stokes Raman spectroscopy (CARS) techniques are recognized for their ability to detect and identify vibrational coherent processes down to the single-molecular levels. Plasmonic oligomers supporting full-range Fano-like line profiles in their scattering spectrum are one of the most promising class of substrates in the context of surface-enhanced (SE) CARS application. In this work, an engineered assembly of metallic disk-shaped nanoparticles providing two Fano-like resonance modes is presented as a highly-efficient design of SECARS substrate. We show that the scattering dips corresponding to the double-Fano spectral line shapes are originated from the mutual interaction of electric and toroidal dipole moments, leading to the so-called non-trivial first- and second-order anapole states. The anapole modes, especially the higher-order ones, can result in huge near-field enhancement due to their light-trapping capability into the so-called “hot spots”. In addition, independent spectral tunability of the second Fano line shape is exhibited by modulating the gap distance of the corner particles. This feature is closely related to the electric current loop associated with the corner particles in the second-order anapole state and provides a simple design procedure of an optimum SECARS substrate, where the electric field hot spots corresponding to three involved wavelengths, i.e., anti-Stokes, pump, and Stokes, are localized at the same spatial position. These findings yield valuable insight into the plasmonic substrate design for SECARS applications as well as for other nonlinear optical processes, such as four-wave mixing and multi-photon surface spectroscopy.Maryam GhahremaniMojtaba Karimi HabilCarlos J. Zapata-RodriguezNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-14 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Maryam Ghahremani Mojtaba Karimi Habil Carlos J. Zapata-Rodriguez Anapole-assisted giant electric field enhancement for surface-enhanced coherent anti-Stokes Raman spectroscopy
description	Abstract The coherent anti-Stokes Raman spectroscopy (CARS) techniques are recognized for their ability to detect and identify vibrational coherent processes down to the single-molecular levels. Plasmonic oligomers supporting full-range Fano-like line profiles in their scattering spectrum are one of the most promising class of substrates in the context of surface-enhanced (SE) CARS application. In this work, an engineered assembly of metallic disk-shaped nanoparticles providing two Fano-like resonance modes is presented as a highly-efficient design of SECARS substrate. We show that the scattering dips corresponding to the double-Fano spectral line shapes are originated from the mutual interaction of electric and toroidal dipole moments, leading to the so-called non-trivial first- and second-order anapole states. The anapole modes, especially the higher-order ones, can result in huge near-field enhancement due to their light-trapping capability into the so-called “hot spots”. In addition, independent spectral tunability of the second Fano line shape is exhibited by modulating the gap distance of the corner particles. This feature is closely related to the electric current loop associated with the corner particles in the second-order anapole state and provides a simple design procedure of an optimum SECARS substrate, where the electric field hot spots corresponding to three involved wavelengths, i.e., anti-Stokes, pump, and Stokes, are localized at the same spatial position. These findings yield valuable insight into the plasmonic substrate design for SECARS applications as well as for other nonlinear optical processes, such as four-wave mixing and multi-photon surface spectroscopy.
format	article
author	Maryam Ghahremani Mojtaba Karimi Habil Carlos J. Zapata-Rodriguez
author_facet	Maryam Ghahremani Mojtaba Karimi Habil Carlos J. Zapata-Rodriguez
author_sort	Maryam Ghahremani
title	Anapole-assisted giant electric field enhancement for surface-enhanced coherent anti-Stokes Raman spectroscopy
title_short	Anapole-assisted giant electric field enhancement for surface-enhanced coherent anti-Stokes Raman spectroscopy
title_full	Anapole-assisted giant electric field enhancement for surface-enhanced coherent anti-Stokes Raman spectroscopy
title_fullStr	Anapole-assisted giant electric field enhancement for surface-enhanced coherent anti-Stokes Raman spectroscopy
title_full_unstemmed	Anapole-assisted giant electric field enhancement for surface-enhanced coherent anti-Stokes Raman spectroscopy
title_sort	anapole-assisted giant electric field enhancement for surface-enhanced coherent anti-stokes raman spectroscopy
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/e09b2f9394d44b2abfd28705f0b5c23c
work_keys_str_mv	AT maryamghahremani anapoleassistedgiantelectricfieldenhancementforsurfaceenhancedcoherentantistokesramanspectroscopy AT mojtabakarimihabil anapoleassistedgiantelectricfieldenhancementforsurfaceenhancedcoherentantistokesramanspectroscopy AT carlosjzapatarodriguez anapoleassistedgiantelectricfieldenhancementforsurfaceenhancedcoherentantistokesramanspectroscopy
_version_	1718382951098482688

Anapole-assisted giant electric field enhancement for surface-enhanced coherent anti-Stokes Raman spectroscopy

Ejemplares similares