Multiband transparency effect induced by toroidal excitation in a strongly coupled planar terahertz metamaterial

Abstract The multiband transparency effect in terahertz (THz) domain has intrigued the scientific community due to its significance in developing THz multiband devices. In this article, we have proposed a planar metamaterial geometry comprised of a toroidal split ring resonator (TSRR) flanked by two...

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Autores principales:	Angana Bhattacharya, Rakesh Sarkar, Naval K. Sharma, Bhairov K. Bhowmik, Amir Ahmad, Gagan Kumar
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/3cc7db1264ff4457a5152b375a75b87f
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spelling	oai:doaj.org-article:3cc7db1264ff4457a5152b375a75b87f2021-12-02T17:37:24ZMultiband transparency effect induced by toroidal excitation in a strongly coupled planar terahertz metamaterial10.1038/s41598-021-98498-42045-2322https://doaj.org/article/3cc7db1264ff4457a5152b375a75b87f2021-09-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-98498-4https://doaj.org/toc/2045-2322Abstract The multiband transparency effect in terahertz (THz) domain has intrigued the scientific community due to its significance in developing THz multiband devices. In this article, we have proposed a planar metamaterial geometry comprised of a toroidal split ring resonator (TSRR) flanked by two asymmetric C resonators. The proposed geometry results in multi-band transparency windows in the THz region via strong near field coupling of the toroidal excitation with the dipolar C-resonators of the meta molecule. The geometry displays dominant toroidal excitation as demonstrated by a multipolar analysis of scattered radiation. High Q factor resonances of the metamaterial configuration is reported which can find significance in sensing applications. We report the frequency modulation of transparency windows by changing the separation between TSRR and the C resonators. The numerically simulated findings have been interpreted and validated using an equivalent theoretical model based upon three coupled oscillators system. Such modeling of toroidal resonances may be utilized in future studies on toroidal excitation based EIT responses in metamaterials. Our study has the potential to impact the development of terahertz photonic components useful in building next generation devices.Angana BhattacharyaRakesh SarkarNaval K. SharmaBhairov K. BhowmikAmir AhmadGagan KumarNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Angana Bhattacharya Rakesh Sarkar Naval K. Sharma Bhairov K. Bhowmik Amir Ahmad Gagan Kumar Multiband transparency effect induced by toroidal excitation in a strongly coupled planar terahertz metamaterial
description	Abstract The multiband transparency effect in terahertz (THz) domain has intrigued the scientific community due to its significance in developing THz multiband devices. In this article, we have proposed a planar metamaterial geometry comprised of a toroidal split ring resonator (TSRR) flanked by two asymmetric C resonators. The proposed geometry results in multi-band transparency windows in the THz region via strong near field coupling of the toroidal excitation with the dipolar C-resonators of the meta molecule. The geometry displays dominant toroidal excitation as demonstrated by a multipolar analysis of scattered radiation. High Q factor resonances of the metamaterial configuration is reported which can find significance in sensing applications. We report the frequency modulation of transparency windows by changing the separation between TSRR and the C resonators. The numerically simulated findings have been interpreted and validated using an equivalent theoretical model based upon three coupled oscillators system. Such modeling of toroidal resonances may be utilized in future studies on toroidal excitation based EIT responses in metamaterials. Our study has the potential to impact the development of terahertz photonic components useful in building next generation devices.
format	article
author	Angana Bhattacharya Rakesh Sarkar Naval K. Sharma Bhairov K. Bhowmik Amir Ahmad Gagan Kumar
author_facet	Angana Bhattacharya Rakesh Sarkar Naval K. Sharma Bhairov K. Bhowmik Amir Ahmad Gagan Kumar
author_sort	Angana Bhattacharya
title	Multiband transparency effect induced by toroidal excitation in a strongly coupled planar terahertz metamaterial
title_short	Multiband transparency effect induced by toroidal excitation in a strongly coupled planar terahertz metamaterial
title_full	Multiband transparency effect induced by toroidal excitation in a strongly coupled planar terahertz metamaterial
title_fullStr	Multiband transparency effect induced by toroidal excitation in a strongly coupled planar terahertz metamaterial
title_full_unstemmed	Multiband transparency effect induced by toroidal excitation in a strongly coupled planar terahertz metamaterial
title_sort	multiband transparency effect induced by toroidal excitation in a strongly coupled planar terahertz metamaterial
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/3cc7db1264ff4457a5152b375a75b87f
work_keys_str_mv	AT anganabhattacharya multibandtransparencyeffectinducedbytoroidalexcitationinastronglycoupledplanarterahertzmetamaterial AT rakeshsarkar multibandtransparencyeffectinducedbytoroidalexcitationinastronglycoupledplanarterahertzmetamaterial AT navalksharma multibandtransparencyeffectinducedbytoroidalexcitationinastronglycoupledplanarterahertzmetamaterial AT bhairovkbhowmik multibandtransparencyeffectinducedbytoroidalexcitationinastronglycoupledplanarterahertzmetamaterial AT amirahmad multibandtransparencyeffectinducedbytoroidalexcitationinastronglycoupledplanarterahertzmetamaterial AT gagankumar multibandtransparencyeffectinducedbytoroidalexcitationinastronglycoupledplanarterahertzmetamaterial
_version_	1718379877267144704

Multiband transparency effect induced by toroidal excitation in a strongly coupled planar terahertz metamaterial

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