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A broadband tunable terahertz negative refractive index metamaterial
A strategy to greatly broaden negative refractive index (NRI) band, reduce loss and ease bi-anisotropy of NRI metamaterials (MMs) has been proposed at terahertz frequencies. Due to the symmetric structure of the MM, the transmission and refractive index are independent to polarizations of incident r...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6026203/ https://www.ncbi.nlm.nih.gov/pubmed/29959377 http://dx.doi.org/10.1038/s41598-018-28221-3 |
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author | Ling, Fang Zhong, Zheqiang Huang, Renshuai Zhang, Bin |
author_facet | Ling, Fang Zhong, Zheqiang Huang, Renshuai Zhang, Bin |
author_sort | Ling, Fang |
collection | PubMed |
description | A strategy to greatly broaden negative refractive index (NRI) band, reduce loss and ease bi-anisotropy of NRI metamaterials (MMs) has been proposed at terahertz frequencies. Due to the symmetric structure of the MM, the transmission and refractive index are independent to polarizations of incident radiations, and a broadband NRI is obtainable for the range of the incident angle from 0° to 26°. In addition, THz MMs’ properties such as transmission, phase and negative refraction exhibit a real-time response by controlling the temperature. The results indicate that the maximum bands of the negative and double-negative refraction are 1.66 THz and 1.37 THz for the temperature of 40 °C and 63 °C, respectively. The figure of merit of the MMs exceeds 10 (that is, low loss) as the frequency increases from 2.44 THz to 2.56 THz in the working temperature range, and the maximum figure of merit is 83.77 at 2.01 THz where the refractive index is −2.81 for a given temperature of 40 °C. Furthermore, the negative refraction of the MMs at the low loss band is verified by the classical method of the wedge, and the symmetric slab waveguide based on the proposed MM has many unique properties. |
format | Online Article Text |
id | pubmed-6026203 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-60262032018-07-09 A broadband tunable terahertz negative refractive index metamaterial Ling, Fang Zhong, Zheqiang Huang, Renshuai Zhang, Bin Sci Rep Article A strategy to greatly broaden negative refractive index (NRI) band, reduce loss and ease bi-anisotropy of NRI metamaterials (MMs) has been proposed at terahertz frequencies. Due to the symmetric structure of the MM, the transmission and refractive index are independent to polarizations of incident radiations, and a broadband NRI is obtainable for the range of the incident angle from 0° to 26°. In addition, THz MMs’ properties such as transmission, phase and negative refraction exhibit a real-time response by controlling the temperature. The results indicate that the maximum bands of the negative and double-negative refraction are 1.66 THz and 1.37 THz for the temperature of 40 °C and 63 °C, respectively. The figure of merit of the MMs exceeds 10 (that is, low loss) as the frequency increases from 2.44 THz to 2.56 THz in the working temperature range, and the maximum figure of merit is 83.77 at 2.01 THz where the refractive index is −2.81 for a given temperature of 40 °C. Furthermore, the negative refraction of the MMs at the low loss band is verified by the classical method of the wedge, and the symmetric slab waveguide based on the proposed MM has many unique properties. Nature Publishing Group UK 2018-06-29 /pmc/articles/PMC6026203/ /pubmed/29959377 http://dx.doi.org/10.1038/s41598-018-28221-3 Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Ling, Fang Zhong, Zheqiang Huang, Renshuai Zhang, Bin A broadband tunable terahertz negative refractive index metamaterial |
title | A broadband tunable terahertz negative refractive index metamaterial |
title_full | A broadband tunable terahertz negative refractive index metamaterial |
title_fullStr | A broadband tunable terahertz negative refractive index metamaterial |
title_full_unstemmed | A broadband tunable terahertz negative refractive index metamaterial |
title_short | A broadband tunable terahertz negative refractive index metamaterial |
title_sort | broadband tunable terahertz negative refractive index metamaterial |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6026203/ https://www.ncbi.nlm.nih.gov/pubmed/29959377 http://dx.doi.org/10.1038/s41598-018-28221-3 |
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