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Demonstration of Ultra-Tunable Terahertz Broadband Absorption using Graphene Based Metamaterial Absorber
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DOI：10.1007/s11468-026-03417-w.png)
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Abstract
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In this work, a tunable broadband terahertz (THz) metamaterial absorber based on graphene is realized. The metasurface absorber employs a simple tri-layer configuration consisting of a metallic ground plane, a dielectric spacer, and a patterned graphene, offering a compact profile and reduced thickness compared to conventional designs. Simulation results demonstrate that the structure achieves a broad absorption bandwidth of 3.91–6.82 THz with absorptance exceeding 90% for both transverse electric (TE) and transverse magnetic (TM) polarizations under normal incidence. Within this range, the absorber exhibits ultra-high efficiency, with absorptance above 99% over a 1.38 THz band and above 95% across a 2.56 THz band. Electric field distributions confirm that the strong absorption originates from the coupled excitation of electric and magnetic resonances in the graphene layer, enhanced by Fabry–Perot cavity effects. The absorber further exhibits excellent polarization insensitivity and stable performance under oblique incidence due to its symmetric geometrical design. With its broad operating bandwidth, high absorption efficiency, and structural simplicity, the proposed absorber offers strong potential for applications in THz stealth, thermal imaging, and sensing technologies.
Keywords:
Terahertz
Graphene
Metamaterial absorber
Tunable
Broadband
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