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Updated: Nov 5, 2025
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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
Published on: December 27, 2012
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Ultra-wideband terahertz absorber based on graphene modulation
Applied Optics
|May 13, 2021
Summary
This study introduces an ultra-wideband terahertz absorber (UWTA) using graphene layers. It achieves over 90% absorption across a wide frequency range, tunable via graphene
Area of Science:
- Terahertz (THz) technology
- Materials science
- Optoelectronics
Background:
- Terahertz absorbers are crucial for various applications, including sensing and imaging.
- Achieving wideband absorption with tunability remains a challenge.
Purpose of the Study:
- To propose and analyze an ultra-wideband terahertz absorber (UWTA).
- To demonstrate the tunability of the absorber's performance through graphene's chemical potential.
Main Methods:
- Fabrication of a multi-layer structure comprising substrate, dielectric, and five-layer graphenes.
- Modulation of graphene's chemical potential to control absorption characteristics.
Main Results:
- Achieved absorption coefficient > 0.9 over the frequency range of 1.51-8.25 THz.
- Demonstrated an absorption bandwidth of 6.74 THz, a relative bandwidth of 138.1%, and a modulation depth of 78.7%.
- Showcased tunability by adjusting the number of graphene layers and chemical potential to compensate for manufacturing errors.
Conclusions:
- The proposed UWTA offers significant potential for THz applications requiring broadband and tunable absorption.
- The design flexibility allows for optimization of bandwidth, relative bandwidth, and modulation depth.
- Tunable chemical potential provides a method for error correction during fabrication.
