Broadband Polarization-Insensitive Tunable Terahertz Metamaterial Absorber Based on an Asymmetric Graphene Structure.

Ahmed Ali, Sulaiman Al-Sowayan, Waleed Shihzad, Asrafali Barkathulla, Zaid Ahmed Shamsan, Majeed A S Alkanhal, Yosef T Aladadi

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Article in Nanomaterials (Basel, Switzerland), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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7 authors.

Ahmed AliCollege of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.ORCID 0009-0006-5257-0568

Sulaiman Al-SowayanDepartment of Electrical Engineering, College of Engineering, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh 11432, Saudi Arabia.ORCID 0009-0003-7220-2488

Waleed ShihzadTelecommunication Engineering Department, University of Engineering and Technology, Mardan 23200, Pakistan.

Asrafali BarkathullaTHz Technical Research Center of Shenzhen University, Shenzhen Key Laboratory of Micro-Nano Photonic Information Technology, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.ORCID 0000-0001-5913-348X

Zaid Ahmed ShamsanDepartment of Electrical Engineering, College of Engineering, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh 11432, Saudi Arabia.ORCID 0000-0002-8139-0711

Majeed A S AlkanhalDepartment of Electrical Engineering, College of Engineering, King Saud University, Riyadh 11421, Saudi Arabia.ORCID 0000-0003-3673-0411

Yosef T AladadiDepartment of Electrical Engineering, College of Engineering, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh 11432, Saudi Arabia.ORCID 0000-0002-8511-6701

Funding

Imam Mohammad ibn Saud Islamic University grant number IM-SIU-DDRSP2604

6 · The paper itself

Abstract

A graphene-based tunable broad-band terahertz (THz) metamaterial absorber is presented, exhibiting strong and stable absorption across a wide frequency range. The device employs an ultra-thin three-layer structure consisting of a metallic reflector, a dielectric spacer, and a patterned graphene metasurface with an asymmetric geometry. Through optimized structural parameters, the absorber achieves broad-band absorption exceeding 90% between 2.45 THz and 6.11 THz with a bandwidth of 3.66 THz, featuring three distinct resonant frequencies at 2.764 THz, 3.534 THz, and 5.41 THz, corresponding to peak absorption efficiencies of 97.26%, 96.96%, and 99.90%, respectively. Impedance matching and electric field analyses confirm that the enhanced absorption arises from the strong coupling of electric and magnetic resonances within the multilayer structure. Moreover, the absorber exhibits polarization-insensitive behavior under varying polarization angles and maintains high absorption stability for both TE and TM modes up to an incident angle of 60°, as verified by simulation results, and allows dynamic tunability through Fermi-level modulation. These characteristics highlight the absorber's potential for advanced THz imaging, sensing, and stealth applications.

Indexed as

grapheneimpedance matchingmetamaterial absorberpolarization insensitivityterahertz applicationstunable

Identifiers

PMID42117919

DOI10.3390/nano16090502

PMCPMC13165333

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