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Multi-band terahertz anisotropic metamaterial absorber composed of graphene-based split square ring resonator array
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.
Scientific Reports
|March 30, 2024
Summary
This study presents a tunable graphene metamaterial absorber for terahertz (THz) applications. The novel design achieves over 99% absorption across multiple bands, demonstrating potential for advanced THz devices.
Area of Science:
- * Metamaterials
- * Terahertz (THz) Photonics
- * Graphene-based devices
Background:
- * Metamaterial absorbers are crucial for manipulating electromagnetic waves.
- * Terahertz technology requires efficient and tunable absorption mechanisms.
- * Graphene offers unique tunable electromagnetic properties.
Purpose of the Study:
- * To design and simulate a multi-band anisotropic metamaterial absorber in the THz range.
- * To achieve high absorption rates and dynamic tunability.
- * To validate simulation results with an equivalent circuit model.
Main Methods:
- * Finite Element Method (FEM) simulations using CST Software.
- * Development of an Equivalent Circuit Model (ECM) using MATLAB.
- * Design of a graphene-based split square ring resonator array.
Main Results:
- * Achieved a linear dichroism response of 99% within 0.3-4 THz.
- * Demonstrated absorption rates of 81% (TM mode) and an average of 99.3% (TE mode) across three bands.
- * FEM simulations and ECM results showed excellent agreement.
Conclusions:
- * The proposed graphene metamaterial absorber is highly efficient and tunable.
- * The ECM provides an effective analytical tool for absorber performance evaluation.
- * The absorber shows promise for polarization-sensitive THz devices and systems.
