University of Oulu

Somayyeh Asgari and Tapio Fabritius, "Equivalent circuit model of graphene chiral multi-band metadevice absorber composed of U-shaped resonator array," Opt. Express 28, 39850-39867 (2020)

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

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Author: Asgari, Somayyeh1; Fabritius, Tapio1
Organizations: 1Optoelectronics and Measurement Techniques Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 3.4 MB)
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Language: English
Published: Optical Society of America, 2020
Publish Date: 2021-01-29


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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Series: Optics express
ISSN: 1094-4087
ISSN-E: 1094-4087
ISSN-L: 1094-4087
Volume: 28
Issue: 26
Article number: 412107
DOI: 10.1364/OE.412107
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: Academy of Finland (320017).
Academy of Finland Grant Number: 320017
Detailed Information: 320017 (Academy of Finland Funding decision)
Copyright information: © 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.