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Updated: Aug 8, 2025

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
Published on: December 27, 2012
Terahertz graphene-based multi-functional anisotropic metamaterial and its equivalent circuit model
Somayyeh Asgari1, Tapio Fabritius2
1Optoelectronics and Measurement Techniques Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, Oulu, Finland. somayyeh.asgari@oulu.fi.
This study introduces a novel graphene metamaterial for terahertz (THz) applications. This multi-functional device exhibits tunable absorption and polarization sensitivity, enabling THz switching and mirroring functionalities.
Area of Science:
- * Physics and Materials Science: Focus on electromagnetic properties and metamaterial applications.
- * Nanotechnology: Utilization of graphene for advanced material design.
Background:
- * Terahertz (THz) technology requires advanced materials for efficient signal manipulation.
- * Graphene's unique electronic properties make it a promising candidate for tunable metamaterials.
Purpose of the Study:
- * To design and propose a graphene-based multi-functional anisotropic metamaterial.
- * To investigate its performance in the 0.1-5.5 THz range for THz switching and mirroring applications.
Main Methods:
- * Finite Element Method (FEM) simulations using CST Software for frequency-domain analysis.
- * Equivalent Circuit Modeling (ECM) implemented in MATLAB for performance prediction.
- * Design based on two finite parallel graphene ribbons per unit cell.
Main Results:
- * Demonstrated polarization-sensitive operation due to geometric asymmetry.
- * Achieved dynamically tunable absorption/reflection by altering graphene's Fermi energy level.
- * Confirmed THz switching and inverter functionalities at 1.23 THz and 4.21 THz.
- * Exhibited bi-functional mirroring: triple-band for x-polarization, ultra-broadband for y-polarization.
- * Attained maximum absorption of 100%, maximum linear dichroism (LD) of 100%, and switching extinction ratio of 33.01 dB.
Conclusions:
- * The proposed graphene metamaterial offers versatile functionalities for THz devices.
- * Its tunable and polarization-sensitive nature makes it suitable for advanced THz systems.
- * This work presents a potential platform for future THz electronic and photonic applications.
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