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Toktam Aghaee, A. Orouji (2020)
Highly tunable multi‐band THz absorber with circuit model representation using multi‐bias schemeInternational Journal of Numerical Modelling: Electronic Networks, 33
I. Chaharmahali, Sadegh Biabanifard, M. Mosleh (2020)
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Sadegh Biabanifard (2020)
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Mohammad Biabanifard, Somayyeh Asgari, Sadegh Biabanifard, M. Abrishamian (2019)
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Masoud Zanjani, I. Chaharmahali, Sadegh Biabanifard, S. Hosseini (2019)
A reconfigurable multi-band, multi-bias THz absorberOptik
Toktam Aghaee, A. Orouji (2020)
Reconfigurable multi-band, graphene-based THz absorber: Circuit model approachResults in physics, 16
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Toktam Aghaee, A. Orouji (2020)
Dual-band terahertz absorber based on graphene periodic arrays of disks and ribbons: circuit model approachJournal of Computational Electronics, 20
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Toktam Aghaee, A. Orouji (2019)
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Sadegh Biabanifard, Mohammad Biabanifard, Somayyeh Asgari, Shahrouz Asadi, M. Yagoub (2018)
Tunable ultra-wideband terahertz absorber based on graphene disks and ribbonsOptics Communications
A wide band perfect THz absorber is presented in this work. The structure includes two layers of graphene disks on the silicon dioxide dielectric layer while a golden plate is placed at the bottom to act as a fully reflecting mirror against THz waves. According to the simulations, the device is robust enough to show independent operation versus layers thicknesses variations, chemical potentials mismatches and changing of electron relaxation time. The designed THz absorber in this work is an appropriate basic block for several applications in THz optical systems such as sensors, detectors and modulators.Design/methodology/approachThe layers in the proposed device are modeled via passive circuit elements and consequently, the equivalent circuit of the device is calculated. Leveraging the developed equivalent circuit model (ECM) and impedance matching concept, the proposed device is designed to perfect absorption with 4.7 THz bandwidth that possesses over 90% absorption. Ample simulations are performed using MATLAB (ECM) and CST (finite element method) to verify the superior performance of the device. According to the simulations, the device is robust enough to show independent operation versus layers thicknesses variations, chemical potentials mismatches and changing of electron relaxation time.FindingsThis work reports a wideband THz absorber, composed of two graphene layers. This paper considers the circuit model representation for two different layers of the device. For a unique structure, a highly tunable response versus chemical potential is obtained. The circuit model approach and impedance matching theory are exploited to reduce computational time regarding conventional approaches.Originality/valueA wide band absorber in THz band is presented. Leveraging circuit model approach and impedance matching theory, the design procedure is simplified regarding CPU time and memory requirements compared to conventional methods. Detailed calculations and ample simulations verify the performance excellency of the device to absorb THz incident waves in 2–6.5 THz frequencies. Also, the robustness of the device is investigated versus parameters mismatches like layers thicknesses and chemical potentials values. According to the simulations and absorption response, the proposed device is an appropriate block to be used in THz optical systems such as detectors, imaging systems and optical modulators.
COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering – Emerald Publishing
Published: Aug 26, 2022
Keywords: Circuit analysis; Finite element method; Metamaterials; Equivalent circuit model; Graphene modeling; Metasurfaces
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