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Versatile Tunable Terahertz Absorption Device Based on Bulk Dirac Semimetals and Graphene
Jie Zhou1,2, Xin Sun3, Jun Xu4
1School of Electronic Information and Electrical Engineering, Chengdu University, Chengdu 610100, China.
Molecules (Basel, Switzerland)
|March 13, 2025
Summary
Researchers developed a terahertz broadband absorber using Dirac semimetals and graphene. This device achieves over 80% absorption across a wide frequency range and offers tunable control for enhanced adaptability.
Area of Science:
- Physics
- Materials Science
- Electrical Engineering
Background:
- Terahertz (THz) technology requires efficient broadband absorbers.
- Existing absorbers often lack tunability and adaptability.
- Dirac semimetals and graphene offer unique electromagnetic properties.
Purpose of the Study:
- To design and analyze a novel terahertz broadband absorber.
- To achieve continuous broadband absorption exceeding 80%.
- To explore independent tuning mechanisms using Dirac semimetals and graphene.
Main Methods:
- Simulations using CST Microwave Studio software and the FDID algorithm.
- Design of a terahertz absorber incorporating Dirac semimetals and graphene.
- Analysis via impedance matching and localized surface plasmon resonance (LSPR) theories.
Main Results:
- Achieved continuous broadband absorption >80% from 7.6776 to 9.172 THz.
- Demonstrated two independent tuning modes via graphene and Dirac semimetals.
- Showcased strong electromagnetic adaptability and environmental responsiveness.
Conclusions:
- The proposed terahertz absorber offers enhanced flexibility and adaptability.
- Tunable absorption is achievable by modulating dielectric constants and graphene relaxation time.
- The design shows significant promise for wideband terahertz absorption applications.
