Ultra-compact broadband graphene-based terahertz metamaterial absorber with refractive index sensing capability
Physica Scripta, cilt.101, sa.32, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 101 Sayı: 32
- Basım Tarihi: 2026
- Doi Numarası: 10.1088/1402-4896/ae92d9
- Dergi Adı: Physica Scripta
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, Compendex, INSPEC, zbMATH
- Anahtar Kelimeler: broadband absorption, graphene, metamaterial absorber, terahertz, ultra-compact structure
- Açık Arşiv Koleksiyonu: AVESİS Açık Erişim Koleksiyonu
- Gazi Üniversitesi Adresli: Evet
Özet
This paper presents an ultra-compact broadband terahertz metamaterial absorber based on graphene. The proposed structure exhibits an exceptionally small normalized size of approximately 0.067λ0 × 0.067λ0 × 0.066λ0, making it one of the most compact designs reported in the literature. Unlike many previously reported broadband absorbers that rely on complex multilayer architectures or hybrid active materials, the proposed design employs only two geometrically simple graphene resonators integrated within a three-layer configuration. Arlon 1000D dielectric layer is used to provide appropriate spacing between the resonators and the metallic ground plane, ensuring effective impedance matching, while the copper ground layer completely suppresses transmission. Broadband absorption is achieved through the coupling of multiple resonance modes generated by the resonators of different sizes. As a result, the absorber maintains an absorption level exceeding 90% over the frequency range of 2–2.93 THz. The proposed design offers a unique combination of ultra-compact size, structural simplicity, and broadband absorption performance. The absorber exhibits near polarization-insensitive performance for incident angles up to 30° and maintains stable absorption characteristics under different azimuth angles. Fabrication tolerance analyses demonstrate that the proposed design is robust against dimensional variations, confirming its suitability for practical implementation. Furthermore, the structure is investigated as a refractive-index sensor, exhibiting an average sensitivity of 143 GHz RIU−1 and demonstrating its multifunctional capability. Owing to its unique combination of ultra-compact size, structural simplicity, broadband absorption performance, and sensing potential, the proposed design represents a promising platform for future terahertz devices and integrated THz systems.