Magnetic Nature of Light Transmission through a 5-nm Gap

Abstract Slot antennas have been exploited as important building blocks of optical magnetism because their radiations are invoked by the magnetic fields along the axes, as vectorial Babinet principle predicts. However, optical magnetism of a few-nanometer-width slit, for which fascinating applicatio...

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Autores principales:	Hyosim Yang, Dai-Sik Kim, Richard H. Joon-Yeon Kim, Jae Sung Ahn, Taehee Kang, Jeeyoon Jeong, Dukhyung Lee
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/0d60a3d825cd4c3ea29cb4ee3bb5353f
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spelling	oai:doaj.org-article:0d60a3d825cd4c3ea29cb4ee3bb5353f2021-12-02T15:08:18ZMagnetic Nature of Light Transmission through a 5-nm Gap10.1038/s41598-018-21037-12045-2322https://doaj.org/article/0d60a3d825cd4c3ea29cb4ee3bb5353f2018-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-21037-1https://doaj.org/toc/2045-2322Abstract Slot antennas have been exploited as important building blocks of optical magnetism because their radiations are invoked by the magnetic fields along the axes, as vectorial Babinet principle predicts. However, optical magnetism of a few-nanometer-width slit, for which fascinating applications are found due to the colossal field enhancement but Babinet principle fails due to the nonnegligible thickness, has not been investigated. In this paper, we demonstrated that the magnetic field plays a dominant role in light transmission through a 5-nm slit on a 150-nm-thick gold film. The 5-nm slit was fabricated by atomic layer lithography, and the transmission was investigated for various incident angles by experiment and simulation at 785-nm wavelength. We found that, due to the deep subwavelength gap width, the transmission has the same incident angle dependence as the tangential magnetic field on the metal surface and this magnetic nature of a nanogap holds up to ~100-nm width. Our analysis establishes conditions for nanogap optical magnetism and suggests new possibilities in realizing magnetic-field-driven optical nonlinearities.Hyosim YangDai-Sik KimRichard H. Joon-Yeon KimJae Sung AhnTaehee KangJeeyoon JeongDukhyung LeeNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-6 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Hyosim Yang Dai-Sik Kim Richard H. Joon-Yeon Kim Jae Sung Ahn Taehee Kang Jeeyoon Jeong Dukhyung Lee Magnetic Nature of Light Transmission through a 5-nm Gap
description	Abstract Slot antennas have been exploited as important building blocks of optical magnetism because their radiations are invoked by the magnetic fields along the axes, as vectorial Babinet principle predicts. However, optical magnetism of a few-nanometer-width slit, for which fascinating applications are found due to the colossal field enhancement but Babinet principle fails due to the nonnegligible thickness, has not been investigated. In this paper, we demonstrated that the magnetic field plays a dominant role in light transmission through a 5-nm slit on a 150-nm-thick gold film. The 5-nm slit was fabricated by atomic layer lithography, and the transmission was investigated for various incident angles by experiment and simulation at 785-nm wavelength. We found that, due to the deep subwavelength gap width, the transmission has the same incident angle dependence as the tangential magnetic field on the metal surface and this magnetic nature of a nanogap holds up to ~100-nm width. Our analysis establishes conditions for nanogap optical magnetism and suggests new possibilities in realizing magnetic-field-driven optical nonlinearities.
format	article
author	Hyosim Yang Dai-Sik Kim Richard H. Joon-Yeon Kim Jae Sung Ahn Taehee Kang Jeeyoon Jeong Dukhyung Lee
author_facet	Hyosim Yang Dai-Sik Kim Richard H. Joon-Yeon Kim Jae Sung Ahn Taehee Kang Jeeyoon Jeong Dukhyung Lee
author_sort	Hyosim Yang
title	Magnetic Nature of Light Transmission through a 5-nm Gap
title_short	Magnetic Nature of Light Transmission through a 5-nm Gap
title_full	Magnetic Nature of Light Transmission through a 5-nm Gap
title_fullStr	Magnetic Nature of Light Transmission through a 5-nm Gap
title_full_unstemmed	Magnetic Nature of Light Transmission through a 5-nm Gap
title_sort	magnetic nature of light transmission through a 5-nm gap
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/0d60a3d825cd4c3ea29cb4ee3bb5353f
work_keys_str_mv	AT hyosimyang magneticnatureoflighttransmissionthrougha5nmgap AT daisikkim magneticnatureoflighttransmissionthrougha5nmgap AT richardhjoonyeonkim magneticnatureoflighttransmissionthrougha5nmgap AT jaesungahn magneticnatureoflighttransmissionthrougha5nmgap AT taeheekang magneticnatureoflighttransmissionthrougha5nmgap AT jeeyoonjeong magneticnatureoflighttransmissionthrougha5nmgap AT dukhyunglee magneticnatureoflighttransmissionthrougha5nmgap
_version_	1718388169233137664

Magnetic Nature of Light Transmission through a 5-nm Gap

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