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Related Experiment Video

Updated: Dec 18, 2025

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

Published on: December 27, 2012

Broadband dynamically tunable terahertz absorber based on a Dirac semimetal.

Han Xiong, Qi Shen, Qing Ji

|June 17, 2020

Summary

We developed a tunable metamaterial absorber for terahertz (THz) applications. This device achieves over 90% absorption and its bandwidth is dynamically controlled by adjusting the Dirac semimetal

Area of Science:

Condensed matter physics
Metamaterial science
Terahertz (THz) technology

Background:

Metamaterials offer unique electromagnetic properties.
Efficient terahertz absorption is crucial for various applications.
Tunable absorbers are highly desirable for dynamic control.

Purpose of the Study:

To propose and investigate a broadband tunable metamaterial absorber in the terahertz region.
To demonstrate dynamic control over absorption bandwidth and peak frequency.
To elucidate the underlying physical mechanisms of high absorption.

Main Methods:

Numerical simulations were employed to design and analyze the metamaterial absorber.
The absorber structure consists of a Dirac semimetal film, dielectric layer, and gold ground plane.

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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

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Analysis included examining magnetic field, surface current, and power loss density distributions.

Main Results:

The proposed absorber demonstrates absorptivity above 90% within a broad frequency range (5.7–8.4 THz).
Tunable absorption is achieved by varying the Fermi energy of the Dirac semimetal film (40–80 meV).
Detailed analysis revealed the resonant mechanisms responsible for high absorption.

Conclusions:

The developed metamaterial absorber offers efficient and tunable broadband absorption in the THz range.
The dynamic tunability via Fermi energy modulation presents a promising approach for THz devices.
Potential applications include advanced sensors, detectors, and photovoltaic devices.