Fano resonance with high local field enhancement under azimuthally polarized excitation

Abstract Being an enabling technology for applications such as ultrasensitive biosensing and surface enhanced spectroscopy, enormous research interests have been focused on further boosting the local field enhancement at Fano resonance. Here, we demonstrate a plasmonic Fano resonance resulting from...

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Autores principales:	Wuyun Shang, Fajun Xiao, Weiren Zhu, Hongsen He, Malin Premaratne, Ting Mei, Jianlin Zhao
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/588ac3c8b94b4e8ea62950a4112147d7
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spelling	oai:doaj.org-article:588ac3c8b94b4e8ea62950a4112147d72021-12-02T11:52:22ZFano resonance with high local field enhancement under azimuthally polarized excitation10.1038/s41598-017-00785-62045-2322https://doaj.org/article/588ac3c8b94b4e8ea62950a4112147d72017-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-00785-6https://doaj.org/toc/2045-2322Abstract Being an enabling technology for applications such as ultrasensitive biosensing and surface enhanced spectroscopy, enormous research interests have been focused on further boosting the local field enhancement at Fano resonance. Here, we demonstrate a plasmonic Fano resonance resulting from the interference between a narrow magnetic dipole mode and a broad electric dipole mode in a split-ring resonator (SRR) coupled to a nanoarc structure. Strikingly, when subjected to an azimuthally polarized beam (APB) excitation, the intensity enhancement becomes more than 60 times larger than that for a linearly polarized beam (LPB). We attribute this intensity enhancement to the improved conversion efficiency between the excitation and magnetic dipole mode along with improved near-field coupling. The APB excited Fano structure is further used as a nanoruler and beam misalignment sensor, due to the high sensitivity of intensity enhancement and scattering spectra to structure irregularities and excitation beam misalignment. Interestingly, we find that, regardless of the presence of structural translations, the proposed structure still maintains over 60 times better intensity enhancement under APB excitation compared to LPB excitation. Moreover, even if the APB excitation is somewhat misaligned, our Fano structure still manages to give a larger intensity enhancement than its counterpart excited by LPB.Wuyun ShangFajun XiaoWeiren ZhuHongsen HeMalin PremaratneTing MeiJianlin ZhaoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Wuyun Shang Fajun Xiao Weiren Zhu Hongsen He Malin Premaratne Ting Mei Jianlin Zhao Fano resonance with high local field enhancement under azimuthally polarized excitation
description	Abstract Being an enabling technology for applications such as ultrasensitive biosensing and surface enhanced spectroscopy, enormous research interests have been focused on further boosting the local field enhancement at Fano resonance. Here, we demonstrate a plasmonic Fano resonance resulting from the interference between a narrow magnetic dipole mode and a broad electric dipole mode in a split-ring resonator (SRR) coupled to a nanoarc structure. Strikingly, when subjected to an azimuthally polarized beam (APB) excitation, the intensity enhancement becomes more than 60 times larger than that for a linearly polarized beam (LPB). We attribute this intensity enhancement to the improved conversion efficiency between the excitation and magnetic dipole mode along with improved near-field coupling. The APB excited Fano structure is further used as a nanoruler and beam misalignment sensor, due to the high sensitivity of intensity enhancement and scattering spectra to structure irregularities and excitation beam misalignment. Interestingly, we find that, regardless of the presence of structural translations, the proposed structure still maintains over 60 times better intensity enhancement under APB excitation compared to LPB excitation. Moreover, even if the APB excitation is somewhat misaligned, our Fano structure still manages to give a larger intensity enhancement than its counterpart excited by LPB.
format	article
author	Wuyun Shang Fajun Xiao Weiren Zhu Hongsen He Malin Premaratne Ting Mei Jianlin Zhao
author_facet	Wuyun Shang Fajun Xiao Weiren Zhu Hongsen He Malin Premaratne Ting Mei Jianlin Zhao
author_sort	Wuyun Shang
title	Fano resonance with high local field enhancement under azimuthally polarized excitation
title_short	Fano resonance with high local field enhancement under azimuthally polarized excitation
title_full	Fano resonance with high local field enhancement under azimuthally polarized excitation
title_fullStr	Fano resonance with high local field enhancement under azimuthally polarized excitation
title_full_unstemmed	Fano resonance with high local field enhancement under azimuthally polarized excitation
title_sort	fano resonance with high local field enhancement under azimuthally polarized excitation
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/588ac3c8b94b4e8ea62950a4112147d7
work_keys_str_mv	AT wuyunshang fanoresonancewithhighlocalfieldenhancementunderazimuthallypolarizedexcitation AT fajunxiao fanoresonancewithhighlocalfieldenhancementunderazimuthallypolarizedexcitation AT weirenzhu fanoresonancewithhighlocalfieldenhancementunderazimuthallypolarizedexcitation AT hongsenhe fanoresonancewithhighlocalfieldenhancementunderazimuthallypolarizedexcitation AT malinpremaratne fanoresonancewithhighlocalfieldenhancementunderazimuthallypolarizedexcitation AT tingmei fanoresonancewithhighlocalfieldenhancementunderazimuthallypolarizedexcitation AT jianlinzhao fanoresonancewithhighlocalfieldenhancementunderazimuthallypolarizedexcitation
_version_	1718395047740702720

Fano resonance with high local field enhancement under azimuthally polarized excitation

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