Equivalent circuit model of graphene chiral multi-band metadevice absorber composed of U-shaped resonator array

Somayyeh Asgari; Tapio Fabritius

doi:10.1364/oe.412107

journal article Dec 16, 2020

Equivalent circuit model of graphene chiral multi-band metadevice absorber composed of U-shaped resonator array

Somayyeh Asgari

Tapio Fabritius

Optics Express Vol. 28 No. 26 pp. 39850 · Optica Publishing Group

View at Publisher Save 10.1364/oe.412107

Abstract

In this study, we have designed an equivalent circuit model (ECM) by use of a simple MATLAB code to analyze a single-layered graphene chiral multi-band metadevice absorber which is composed of U-shaped graphene resonator array in terahertz (THz) region. In addition, the proposed metadevice absorber is analyzed numerically by the finite element method (FEM) in CST Software to verify the ECM analysis. The proposed device which is the first tunable graphene-based chiral metadevice absorber can be used in polarization sensitive devices in THz region. It is single-layered, tunable, and it has strong linear dichroism (LD) response of 94% and absorption of 99% for both transverse electric (TE) and transverse magnetic (TM) electromagnetic waves. It has four absorption bands with absorption >50% in 0.5-4.5 THz : three absorption bands for TE mode and one absorption band for TM mode. Proposed ECM has good agreement with the FEM simulation results. ECM analysis provides a simple, fast, and effective way to understand the resonance modes of the metadevice absorber and gives guidance for the analysis and design of the graphene chiral metadevices in the THz region.

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Metrics

53

Citations

61

References

Details

Published: Dec 16, 2020
Vol/Issue: 28(26)
Pages: 39850
License: View

Authors

S

Somayyeh Asgari

Optoelectronics and Measurement Techniques Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, Oulu, Finland

T

Tapio Fabritius

Optoelectronics and Measurement Techniques Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, Oulu, Finland

Funding

Academy of Finland Award: 320017

Cite This Article

Somayyeh Asgari, Tapio Fabritius (2020). Equivalent circuit model of graphene chiral multi-band metadevice absorber composed of U-shaped resonator array. Optics Express, 28(26), 39850. https://doi.org/10.1364/oe.412107

Equivalent circuit model of graphene chiral multi-band metadevice absorber composed of U-shaped resonator array

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