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JIANJUN LIU1, JIANHUA LONG1, SONXI HU1,*
A dual-band terahertz metamaterial sensor based on nested split-ring resonators and closed square rings on a flexible polyimide substrate is proposed in this paper. The structure consists of an outer split-ring resonator, an inner closed square ring, and a continuous gold ground plane. Simulations using CST Studio Suite 2022 demonstrate two independent resonant peaks at 1.107 THz and 1.4414 THz in air, with absorption rates of 99.87% and 99.82%, respectively. The refractive index sensitivity reaches 237.93 GHz/RIU, and the frequency shift exhibits an excellent linear relationship with the refractive index variation. The sensor also features polarization insensitivity and angular stability. Analyses of the electric field, magnetic field, and surface current distributions indicate that the low-frequency mode is primarily excited by the fundamental LC resonance dominated by the outer split ring, while the high-frequency mode arises from the loop-current magnetic resonance dominated by the inner closed square ring. With its simple structure, strong fabrication compatibility, and outstanding robustness, the proposed design simultaneously achieves high absorption, high sensitivity, and comprehensive environmental adaptability on a flexible substrate compared with recent dual-band terahertz sensors. It holds significant potential for biomolecular detection, chemical trace analysis, and wearable sensing applications.
Terahertz metamaterials, Dual-band absorber, Polarization-insensitive, Angularly stable.
JIANJUN LIU, JIANHUA LONG, SONXI HU, Dual-band flexible terahertz metamaterial sensor based on nested resonant rings, Optoelectronics and Advanced Materials - Rapid Communications, 20, 5-6, May-June 2026, pp.200-211 (2026).
Submitted at: Jan. 26, 2026
Accepted at: June 2, 2026
Optoelectronics and Advanced Materials - Rapid Communications
(2024): Impact Factor = 0.4 - Journal Citation Reports (Clarivate Analytics, 2025)
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