Revealing the plasmon coupling in gold nanochains directly from the near field

We studied the near-field properties of localized surface plasmon resonances in finite linear gold nanochains using photoemission electron microscopy (PEEM). The localization of the electromagnetic field in the near-field region was mapped at high spatial resolution. By tuning the excitation laser w...

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Autores principales:	Sun Quan, Yu Han, Ueno Kosei, Zu Shuai, Matsuo Yasutaka, Misawa Hiroaki
Formato:	article
Lenguaje:	EN
Publicado:	Institue of Optics and Electronics, Chinese Academy of Sciences 2019
Materias:	surface plasmon resonance metallic nanochains near-field imaging photoemission electron microscopy Optics. Light QC350-467
Acceso en línea:	https://doaj.org/article/f57ea0bf8e5449cda66bbde600cacac0
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spelling	oai:doaj.org-article:f57ea0bf8e5449cda66bbde600cacac02021-11-11T09:53:46ZRevealing the plasmon coupling in gold nanochains directly from the near field2096-457910.29026/oea.2019.180030https://doaj.org/article/f57ea0bf8e5449cda66bbde600cacac02019-04-01T00:00:00Zhttp://www.oejournal.org/article/doi/10.29026/oea.2019.180030https://doaj.org/toc/2096-4579We studied the near-field properties of localized surface plasmon resonances in finite linear gold nanochains using photoemission electron microscopy (PEEM). The localization of the electromagnetic field in the near-field region was mapped at high spatial resolution. By tuning the excitation laser wavelength, we can obtain the near-field spectra, from which the energy splitting between longitudinal (L) and transverse (T) plasmon modes can be revealed. In particular, the L-mode red shifts and the T-mode blue shifts with increasing chain length. The red shift of the L-mode is highly dependent on the gap distance. In contrast, the T-mode almost remains constant within the range of gap distance we investigated. This energy splitting between the L-mode and the T-mode of metallic chains is in agreement with previous far-field measurements, where it was explained by dipole-dipole near-field coupling. Here, we provide direct proof of this near-field plasmon coupling in nanochains via the above-described near-field measurements using PEEM. In addition, we explore the energy transport along the gold nanochains under excitation at oblique illumination via PEEM measurements together with numerical simulations.Sun QuanYu HanUeno KoseiZu ShuaiMatsuo YasutakaMisawa HiroakiInstitue of Optics and Electronics, Chinese Academy of Sciencesarticlesurface plasmon resonancemetallic nanochainsnear-field imagingphotoemission electron microscopyOptics. LightQC350-467ENOpto-Electronic Advances, Vol 2, Iss 4, Pp 180030-1-180030-7 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	surface plasmon resonance metallic nanochains near-field imaging photoemission electron microscopy Optics. Light QC350-467
spellingShingle	surface plasmon resonance metallic nanochains near-field imaging photoemission electron microscopy Optics. Light QC350-467 Sun Quan Yu Han Ueno Kosei Zu Shuai Matsuo Yasutaka Misawa Hiroaki Revealing the plasmon coupling in gold nanochains directly from the near field
description	We studied the near-field properties of localized surface plasmon resonances in finite linear gold nanochains using photoemission electron microscopy (PEEM). The localization of the electromagnetic field in the near-field region was mapped at high spatial resolution. By tuning the excitation laser wavelength, we can obtain the near-field spectra, from which the energy splitting between longitudinal (L) and transverse (T) plasmon modes can be revealed. In particular, the L-mode red shifts and the T-mode blue shifts with increasing chain length. The red shift of the L-mode is highly dependent on the gap distance. In contrast, the T-mode almost remains constant within the range of gap distance we investigated. This energy splitting between the L-mode and the T-mode of metallic chains is in agreement with previous far-field measurements, where it was explained by dipole-dipole near-field coupling. Here, we provide direct proof of this near-field plasmon coupling in nanochains via the above-described near-field measurements using PEEM. In addition, we explore the energy transport along the gold nanochains under excitation at oblique illumination via PEEM measurements together with numerical simulations.
format	article
author	Sun Quan Yu Han Ueno Kosei Zu Shuai Matsuo Yasutaka Misawa Hiroaki
author_facet	Sun Quan Yu Han Ueno Kosei Zu Shuai Matsuo Yasutaka Misawa Hiroaki
author_sort	Sun Quan
title	Revealing the plasmon coupling in gold nanochains directly from the near field
title_short	Revealing the plasmon coupling in gold nanochains directly from the near field
title_full	Revealing the plasmon coupling in gold nanochains directly from the near field
title_fullStr	Revealing the plasmon coupling in gold nanochains directly from the near field
title_full_unstemmed	Revealing the plasmon coupling in gold nanochains directly from the near field
title_sort	revealing the plasmon coupling in gold nanochains directly from the near field
publisher	Institue of Optics and Electronics, Chinese Academy of Sciences
publishDate	2019
url	https://doaj.org/article/f57ea0bf8e5449cda66bbde600cacac0
work_keys_str_mv	AT sunquan revealingtheplasmoncouplingingoldnanochainsdirectlyfromthenearfield AT yuhan revealingtheplasmoncouplingingoldnanochainsdirectlyfromthenearfield AT uenokosei revealingtheplasmoncouplingingoldnanochainsdirectlyfromthenearfield AT zushuai revealingtheplasmoncouplingingoldnanochainsdirectlyfromthenearfield AT matsuoyasutaka revealingtheplasmoncouplingingoldnanochainsdirectlyfromthenearfield AT misawahiroaki revealingtheplasmoncouplingingoldnanochainsdirectlyfromthenearfield
_version_	1718439274415652864

Revealing the plasmon coupling in gold nanochains directly from the near field

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