Imaging of electric and magnetic fields near plasmonic nanowires

Near-field imaging is a powerful tool to investigate the complex structure of light at the nanoscale. Recent advances in near-field imaging have indicated the possibility for the complete reconstruction of both electric and magnetic components of the evanescent field. Here we study the electro-magne...

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Main Authors:	Kabakova, I. V., de Hoogh, A., van der Wel, R. E. C., Wulf , M., le Feber, B., Kuipers, L.
Format:	Online
Language:	English
Published:	Nature Publishing Group 2016
Online Access:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4780081/

id	pubmed-4780081
recordtype	oai_dc
spelling	pubmed-47800812016-03-09 Imaging of electric and magnetic fields near plasmonic nanowires Kabakova, I. V. de Hoogh, A. van der Wel, R. E. C. Wulf , M. le Feber, B. Kuipers, L. Article Near-field imaging is a powerful tool to investigate the complex structure of light at the nanoscale. Recent advances in near-field imaging have indicated the possibility for the complete reconstruction of both electric and magnetic components of the evanescent field. Here we study the electro-magnetic field structure of surface plasmon polariton waves propagating along subwavelength gold nanowires by performing phase- and polarization-resolved near-field microscopy in collection mode. By applying the optical reciprocity theorem, we describe the signal collected by the probe as an overlap integral of the nanowire’s evanescent field and the probe’s response function. As a result, we find that the probe’s sensitivity to the magnetic field is approximately equal to its sensitivity to the electric field. Through rigorous modeling of the nanowire mode as well as the aperture probe response function, we obtain a good agreement between experimentally measured signals and a numerical model. Our findings provide a better understanding of aperture-based near-field imaging of the nanoscopic plasmonic and photonic structures and are helpful for the interpretation of future near-field experiments. Nature Publishing Group 2016-03-07 /pmc/articles/PMC4780081/ /pubmed/26947124 http://dx.doi.org/10.1038/srep22665 Text en Copyright © 2016, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
repository_type	Open Access Journal
institution_category	Foreign Institution
institution	US National Center for Biotechnology Information
building	NCBI PubMed
collection	Online Access
language	English
format	Online
author	Kabakova, I. V. de Hoogh, A. van der Wel, R. E. C. Wulf , M. le Feber, B. Kuipers, L.
spellingShingle	Kabakova, I. V. de Hoogh, A. van der Wel, R. E. C. Wulf , M. le Feber, B. Kuipers, L. Imaging of electric and magnetic fields near plasmonic nanowires
author_facet	Kabakova, I. V. de Hoogh, A. van der Wel, R. E. C. Wulf , M. le Feber, B. Kuipers, L.
author_sort	Kabakova, I. V.
title	Imaging of electric and magnetic fields near plasmonic nanowires
title_short	Imaging of electric and magnetic fields near plasmonic nanowires
title_full	Imaging of electric and magnetic fields near plasmonic nanowires
title_fullStr	Imaging of electric and magnetic fields near plasmonic nanowires
title_full_unstemmed	Imaging of electric and magnetic fields near plasmonic nanowires
title_sort	imaging of electric and magnetic fields near plasmonic nanowires
description	Near-field imaging is a powerful tool to investigate the complex structure of light at the nanoscale. Recent advances in near-field imaging have indicated the possibility for the complete reconstruction of both electric and magnetic components of the evanescent field. Here we study the electro-magnetic field structure of surface plasmon polariton waves propagating along subwavelength gold nanowires by performing phase- and polarization-resolved near-field microscopy in collection mode. By applying the optical reciprocity theorem, we describe the signal collected by the probe as an overlap integral of the nanowire’s evanescent field and the probe’s response function. As a result, we find that the probe’s sensitivity to the magnetic field is approximately equal to its sensitivity to the electric field. Through rigorous modeling of the nanowire mode as well as the aperture probe response function, we obtain a good agreement between experimentally measured signals and a numerical model. Our findings provide a better understanding of aperture-based near-field imaging of the nanoscopic plasmonic and photonic structures and are helpful for the interpretation of future near-field experiments.
publisher	Nature Publishing Group
publishDate	2016
url	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4780081/
_version_	1613548132626333696

Imaging of electric and magnetic fields near plasmonic nanowires

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