Artificial dielectric polarizing-beamsplitter and isolator for the terahertz region

Abstract We demonstrate a simple and effective strategy for implementing a polarizing beamsplitter for the terahertz spectral region, based on an artificial dielectric medium that is scalable to a range of desired frequencies. The artificial dielectric medium consists of a uniformly spaced stack of...

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Autores principales:	Rajind Mendis, Masaya Nagai, Wei Zhang, Daniel M. Mittleman
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/8e928f97cb0943e5bc7da0774ce24612
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spelling	oai:doaj.org-article:8e928f97cb0943e5bc7da0774ce246122021-12-02T15:05:19ZArtificial dielectric polarizing-beamsplitter and isolator for the terahertz region10.1038/s41598-017-06297-72045-2322https://doaj.org/article/8e928f97cb0943e5bc7da0774ce246122017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-06297-7https://doaj.org/toc/2045-2322Abstract We demonstrate a simple and effective strategy for implementing a polarizing beamsplitter for the terahertz spectral region, based on an artificial dielectric medium that is scalable to a range of desired frequencies. The artificial dielectric medium consists of a uniformly spaced stack of metal plates, which is electromagnetically equivalent to a stacked array of parallel-plate waveguides. The operation of the device relies on both the lowest-order, transverse-electric and transverse-magnetic modes of the parallel-plate waveguide. This is in contrast to previous work that relied solely on the transverse-electric mode. The fabricated polarizing beamsplitter exhibits extinction ratios as high as 42 dB along with insertion losses as low as 0.18 dB. Building on the same idea, we also demonstrate an isolator with non-reciprocal transmission, providing high isolation and low insertion loss at a select design frequency. The performance of our isolator far exceeds that of other experimentally demonstrated terahertz isolators, and indeed, even rivals that of commercially available isolators for optical wavelengths. Because these waveguide-based artificial dielectrics are low loss, inexpensive, and easy to fabricate, this approach offers a promising new route for polarization control of free-space terahertz beams.Rajind MendisMasaya NagaiWei ZhangDaniel M. MittlemanNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Rajind Mendis Masaya Nagai Wei Zhang Daniel M. Mittleman Artificial dielectric polarizing-beamsplitter and isolator for the terahertz region
description	Abstract We demonstrate a simple and effective strategy for implementing a polarizing beamsplitter for the terahertz spectral region, based on an artificial dielectric medium that is scalable to a range of desired frequencies. The artificial dielectric medium consists of a uniformly spaced stack of metal plates, which is electromagnetically equivalent to a stacked array of parallel-plate waveguides. The operation of the device relies on both the lowest-order, transverse-electric and transverse-magnetic modes of the parallel-plate waveguide. This is in contrast to previous work that relied solely on the transverse-electric mode. The fabricated polarizing beamsplitter exhibits extinction ratios as high as 42 dB along with insertion losses as low as 0.18 dB. Building on the same idea, we also demonstrate an isolator with non-reciprocal transmission, providing high isolation and low insertion loss at a select design frequency. The performance of our isolator far exceeds that of other experimentally demonstrated terahertz isolators, and indeed, even rivals that of commercially available isolators for optical wavelengths. Because these waveguide-based artificial dielectrics are low loss, inexpensive, and easy to fabricate, this approach offers a promising new route for polarization control of free-space terahertz beams.
format	article
author	Rajind Mendis Masaya Nagai Wei Zhang Daniel M. Mittleman
author_facet	Rajind Mendis Masaya Nagai Wei Zhang Daniel M. Mittleman
author_sort	Rajind Mendis
title	Artificial dielectric polarizing-beamsplitter and isolator for the terahertz region
title_short	Artificial dielectric polarizing-beamsplitter and isolator for the terahertz region
title_full	Artificial dielectric polarizing-beamsplitter and isolator for the terahertz region
title_fullStr	Artificial dielectric polarizing-beamsplitter and isolator for the terahertz region
title_full_unstemmed	Artificial dielectric polarizing-beamsplitter and isolator for the terahertz region
title_sort	artificial dielectric polarizing-beamsplitter and isolator for the terahertz region
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/8e928f97cb0943e5bc7da0774ce24612
work_keys_str_mv	AT rajindmendis artificialdielectricpolarizingbeamsplitterandisolatorfortheterahertzregion AT masayanagai artificialdielectricpolarizingbeamsplitterandisolatorfortheterahertzregion AT weizhang artificialdielectricpolarizingbeamsplitterandisolatorfortheterahertzregion AT danielmmittleman artificialdielectricpolarizingbeamsplitterandisolatorfortheterahertzregion
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Artificial dielectric polarizing-beamsplitter and isolator for the terahertz region

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