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Article

Versatile Tunable Terahertz Absorption Device Based on Bulk Dirac Semimetals and Graphene

by
Jie Zhou
1,2,
Xin Sun
3,*,
Jun Xu
4,*,
Shiyue Wu
4,
Kaili Jin
4,
Yongjian Tang
5,
Zao Yi
5 and
Yougen Yi
6
1
School of Electronic Information and Electrical Engineering, Chengdu University, Chengdu 610100, China
2
School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
3
College of Urban Construction, Zhejiang Shuren University, Hangzhou 310015, China
4
Institute of Guizhou Aerospace Measuring and Testing Technology, Guiyang 550009, China
5
Joint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology, Mianyang 621010, China
6
College of Physics, Central South University, Changsha 410083, China
*
Authors to whom correspondence should be addressed.
Molecules 2025, 30(5), 999; https://doi.org/10.3390/molecules30050999
Submission received: 19 January 2025 / Revised: 13 February 2025 / Accepted: 17 February 2025 / Published: 21 February 2025
(This article belongs to the Special Issue Two-Dimensional Materials: From Synthesis to Applications, 2nd Edition)
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Abstract

We employed the CST Microwave Studio software 2020 and the FDID algorithm for simulation. We have designed a terahertz broadband absorber based on Dirac semimetals and graphene, achieving continuous broadband absorption with a rate exceeding 80% over the range from 7.6776 to 9.172 THz. This broadband absorber features two independent tuning modes, utilizing graphene and Dirac semimetals, and exhibits strong electromagnetic adaptability. Furthermore, we conducted an in-depth analysis of the physical mechanisms underlying the high absorption in these absorbers using impedance matching theory and localized surface plasmon resonance (LSPR) theory. Variations in the dielectric constants of different dielectric layers and the relaxation time of graphene can also modulate the absorption rate. In summary, our proposed terahertz broadband absorber, employing two distinct tunable materials, enhances the device’s flexibility and environmental adaptability, offering promising prospects for wideband absorption applications.
Keywords: absorber; metamaterial; Dirac semimetal; graphene; terahertz; wideband absorption absorber; metamaterial; Dirac semimetal; graphene; terahertz; wideband absorption

Share and Cite

MDPI and ACS Style

Zhou, J.; Sun, X.; Xu, J.; Wu, S.; Jin, K.; Tang, Y.; Yi, Z.; Yi, Y. Versatile Tunable Terahertz Absorption Device Based on Bulk Dirac Semimetals and Graphene. Molecules 2025, 30, 999. https://doi.org/10.3390/molecules30050999

AMA Style

Zhou J, Sun X, Xu J, Wu S, Jin K, Tang Y, Yi Z, Yi Y. Versatile Tunable Terahertz Absorption Device Based on Bulk Dirac Semimetals and Graphene. Molecules. 2025; 30(5):999. https://doi.org/10.3390/molecules30050999

Chicago/Turabian Style

Zhou, Jie, Xin Sun, Jun Xu, Shiyue Wu, Kaili Jin, Yongjian Tang, Zao Yi, and Yougen Yi. 2025. "Versatile Tunable Terahertz Absorption Device Based on Bulk Dirac Semimetals and Graphene" Molecules 30, no. 5: 999. https://doi.org/10.3390/molecules30050999

APA Style

Zhou, J., Sun, X., Xu, J., Wu, S., Jin, K., Tang, Y., Yi, Z., & Yi, Y. (2025). Versatile Tunable Terahertz Absorption Device Based on Bulk Dirac Semimetals and Graphene. Molecules, 30(5), 999. https://doi.org/10.3390/molecules30050999

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