Multi-band terahertz metamaterial absorber composed of concentric square patch and ring resonator array
Asgari, Somayyeh; Fabritius, Tapio (2024-02-05)
Optica Publishing Group
05.02.2024
Somayyeh Asgari and Tapio Fabritius, "Multi-band terahertz metamaterial absorber composed of concentric square patch and ring resonator array," Opt. Continuum 3, 148-163 (2024)
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© 2024 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement. Authors and readers may use, reuse, and build upon the article, or use it for text or data mining, as long as the purpose is non-commercial and appropriate attribution is maintained.
https://rightsstatements.org/vocab/InC/1.0/
© 2024 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement. Authors and readers may use, reuse, and build upon the article, or use it for text or data mining, as long as the purpose is non-commercial and appropriate attribution is maintained.
https://rightsstatements.org/vocab/InC/1.0/
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:oulu-202404032536
https://urn.fi/URN:NBN:fi:oulu-202404032536
Tiivistelmä
Abstract
An equivalent circuit model (ECM) to analyze a single-layered graphene multi-band metamaterial absorber was developed. This absorber consists of concentric square patch and ring resonator arrays and operates in the terahertz (THz) region. To validate our analysis based on the ECM, we also conducted numerical simulations using the finite element method (FEM) within CST software. Additionally, we have explained the absorption behavior of the metamaterial using the coupled mode theory (CMT). This absorber design, with its single-layer structure, tunability, and triple absorption bands, offers promise for applications in THz devices and systems. Notably, it achieves an average absorption of 99% for three bands and the absorption reaches 100% in the frequency range of 4 to 6.5 THz. The correlation of ECM and CMT analyses with the FEM simulations validate the accuracy and the effectiveness of these simplified approaches in comprehending the resonant characteristics of the metamaterial absorber.
An equivalent circuit model (ECM) to analyze a single-layered graphene multi-band metamaterial absorber was developed. This absorber consists of concentric square patch and ring resonator arrays and operates in the terahertz (THz) region. To validate our analysis based on the ECM, we also conducted numerical simulations using the finite element method (FEM) within CST software. Additionally, we have explained the absorption behavior of the metamaterial using the coupled mode theory (CMT). This absorber design, with its single-layer structure, tunability, and triple absorption bands, offers promise for applications in THz devices and systems. Notably, it achieves an average absorption of 99% for three bands and the absorption reaches 100% in the frequency range of 4 to 6.5 THz. The correlation of ECM and CMT analyses with the FEM simulations validate the accuracy and the effectiveness of these simplified approaches in comprehending the resonant characteristics of the metamaterial absorber.
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