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Quasi-BIC based all-dielectric metasurfaces for ultra-sensitive refractive index and temperature sensing

In this paper, an all-dielectric metasurface that measures refractive index and temperature using silicon disks is presented. It can simultaneously produce three resonances excited by a magnetic toroidal dipole, magnetic toroidal quadrupole, and electric toroidal dipole, in the THz region. Asymmetri...

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Autores principales: Saadatmand, Seyedeh Bita, Ahmadi, Vahid, Hamidi, Seyedeh Mehri
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10667344/
https://www.ncbi.nlm.nih.gov/pubmed/37996608
http://dx.doi.org/10.1038/s41598-023-48051-2
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author Saadatmand, Seyedeh Bita
Ahmadi, Vahid
Hamidi, Seyedeh Mehri
author_facet Saadatmand, Seyedeh Bita
Ahmadi, Vahid
Hamidi, Seyedeh Mehri
author_sort Saadatmand, Seyedeh Bita
collection PubMed
description In this paper, an all-dielectric metasurface that measures refractive index and temperature using silicon disks is presented. It can simultaneously produce three resonances excited by a magnetic toroidal dipole, magnetic toroidal quadrupole, and electric toroidal dipole, in the THz region. Asymmetric structures are used to generate two quasi-bound states in the continuum (BIC) resonances with ultra-high-quality factors driven by magnetic and electric toroidal dipoles. We numerically study and show the dominant electromagnetic excitations in the three resonances through near-field analysis and cartesian multipole decomposition. The effects of geometric parameters, scaling properties, polarization angles, incident angles, and silicon losses are also investigated. The proposed metasurface is an excellent candidate for sensing due to the extremely high-quality factor of the quasi-BICs. The results demonstrate that the sensitivities for liquid and gas detection are S(l) = 569.1 GHz/RIU and S(g) = 529 GHz/RIU for magnetic toroidal dipole, and S(l) = 532 GHz/RIU and S(g) = 498.3 GHz/RIU for electric toroidal dipole, respectively. Furthermore, the sensitivity for temperature monitoring can reach up to 20.24 nm/°C. This work presents a valuable reference for developing applications in the THz region such as optical modulators, multi-channel biochemical sensing, and optical switches.
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spelling pubmed-106673442023-11-23 Quasi-BIC based all-dielectric metasurfaces for ultra-sensitive refractive index and temperature sensing Saadatmand, Seyedeh Bita Ahmadi, Vahid Hamidi, Seyedeh Mehri Sci Rep Article In this paper, an all-dielectric metasurface that measures refractive index and temperature using silicon disks is presented. It can simultaneously produce three resonances excited by a magnetic toroidal dipole, magnetic toroidal quadrupole, and electric toroidal dipole, in the THz region. Asymmetric structures are used to generate two quasi-bound states in the continuum (BIC) resonances with ultra-high-quality factors driven by magnetic and electric toroidal dipoles. We numerically study and show the dominant electromagnetic excitations in the three resonances through near-field analysis and cartesian multipole decomposition. The effects of geometric parameters, scaling properties, polarization angles, incident angles, and silicon losses are also investigated. The proposed metasurface is an excellent candidate for sensing due to the extremely high-quality factor of the quasi-BICs. The results demonstrate that the sensitivities for liquid and gas detection are S(l) = 569.1 GHz/RIU and S(g) = 529 GHz/RIU for magnetic toroidal dipole, and S(l) = 532 GHz/RIU and S(g) = 498.3 GHz/RIU for electric toroidal dipole, respectively. Furthermore, the sensitivity for temperature monitoring can reach up to 20.24 nm/°C. This work presents a valuable reference for developing applications in the THz region such as optical modulators, multi-channel biochemical sensing, and optical switches. Nature Publishing Group UK 2023-11-23 /pmc/articles/PMC10667344/ /pubmed/37996608 http://dx.doi.org/10.1038/s41598-023-48051-2 Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Saadatmand, Seyedeh Bita
Ahmadi, Vahid
Hamidi, Seyedeh Mehri
Quasi-BIC based all-dielectric metasurfaces for ultra-sensitive refractive index and temperature sensing
title Quasi-BIC based all-dielectric metasurfaces for ultra-sensitive refractive index and temperature sensing
title_full Quasi-BIC based all-dielectric metasurfaces for ultra-sensitive refractive index and temperature sensing
title_fullStr Quasi-BIC based all-dielectric metasurfaces for ultra-sensitive refractive index and temperature sensing
title_full_unstemmed Quasi-BIC based all-dielectric metasurfaces for ultra-sensitive refractive index and temperature sensing
title_short Quasi-BIC based all-dielectric metasurfaces for ultra-sensitive refractive index and temperature sensing
title_sort quasi-bic based all-dielectric metasurfaces for ultra-sensitive refractive index and temperature sensing
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10667344/
https://www.ncbi.nlm.nih.gov/pubmed/37996608
http://dx.doi.org/10.1038/s41598-023-48051-2
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