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Terahertz Broadband Absorber Based on a Combined Circular Disc Structure

To solve the problem of complex structure and narrow absorption band of most of today′s terahertz absorbers, this paper proposes and utilizes the finite element (COMSOL) method to numerically simulate a broadband absorber based on a straightforward periodic structure consisting of a disk and concent...

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Autores principales: Huang, Meihong, Wei, Kaihua, Wu, Pinghui, Xu, Danyang, Xu, Yan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8620649/
https://www.ncbi.nlm.nih.gov/pubmed/34832704
http://dx.doi.org/10.3390/mi12111290
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author Huang, Meihong
Wei, Kaihua
Wu, Pinghui
Xu, Danyang
Xu, Yan
author_facet Huang, Meihong
Wei, Kaihua
Wu, Pinghui
Xu, Danyang
Xu, Yan
author_sort Huang, Meihong
collection PubMed
description To solve the problem of complex structure and narrow absorption band of most of today′s terahertz absorbers, this paper proposes and utilizes the finite element (COMSOL) method to numerically simulate a broadband absorber based on a straightforward periodic structure consisting of a disk and concentric ring. The final results show that our designed absorber has an absorption rate of over 99% in the broadband range of 9.06 THz to 9.8 THz and an average of over 97.7% in the ultra-broadband range of 8.62 THz to 10 THz. The reason for the high absorption is explained by the depiction of the electric field on the absorber surface at different frequencies. In addition, the materials for the top pattern of the absorber are replaced by Cu, Ag, or Al, and the absorber still achieves perfect absorption with different metal materials. Due to the perfect symmetry of the absorber structure, the absorber is very polarization-insensitive. The overall design is simple, easy to process and production. Therefore, our research will offer great potential for applications in areas such as terahertz electromagnetic stealth, sensing, and thermal imaging.
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spelling pubmed-86206492021-11-27 Terahertz Broadband Absorber Based on a Combined Circular Disc Structure Huang, Meihong Wei, Kaihua Wu, Pinghui Xu, Danyang Xu, Yan Micromachines (Basel) Article To solve the problem of complex structure and narrow absorption band of most of today′s terahertz absorbers, this paper proposes and utilizes the finite element (COMSOL) method to numerically simulate a broadband absorber based on a straightforward periodic structure consisting of a disk and concentric ring. The final results show that our designed absorber has an absorption rate of over 99% in the broadband range of 9.06 THz to 9.8 THz and an average of over 97.7% in the ultra-broadband range of 8.62 THz to 10 THz. The reason for the high absorption is explained by the depiction of the electric field on the absorber surface at different frequencies. In addition, the materials for the top pattern of the absorber are replaced by Cu, Ag, or Al, and the absorber still achieves perfect absorption with different metal materials. Due to the perfect symmetry of the absorber structure, the absorber is very polarization-insensitive. The overall design is simple, easy to process and production. Therefore, our research will offer great potential for applications in areas such as terahertz electromagnetic stealth, sensing, and thermal imaging. MDPI 2021-10-21 /pmc/articles/PMC8620649/ /pubmed/34832704 http://dx.doi.org/10.3390/mi12111290 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Huang, Meihong
Wei, Kaihua
Wu, Pinghui
Xu, Danyang
Xu, Yan
Terahertz Broadband Absorber Based on a Combined Circular Disc Structure
title Terahertz Broadband Absorber Based on a Combined Circular Disc Structure
title_full Terahertz Broadband Absorber Based on a Combined Circular Disc Structure
title_fullStr Terahertz Broadband Absorber Based on a Combined Circular Disc Structure
title_full_unstemmed Terahertz Broadband Absorber Based on a Combined Circular Disc Structure
title_short Terahertz Broadband Absorber Based on a Combined Circular Disc Structure
title_sort terahertz broadband absorber based on a combined circular disc structure
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8620649/
https://www.ncbi.nlm.nih.gov/pubmed/34832704
http://dx.doi.org/10.3390/mi12111290
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