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Terahertz broadband absorber based on multilayer graphene and its electrical reconfiguration strategy under in-plane deformation
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DOI：10.1016/j.mtadv.2026.100914.png)
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Abstract
En 中文
To address the practical requirements of terahertz radar stealth technology for conformal and robust absorbing materials, this study focuses on developing a flexible terahertz broadband absorber capable of adapting to in-plane deformations. When flexible devices are conformally attached to carriers such as aircraft surfaces, inevitable stretching or compression deformations can lead to resonant frequency detuning and degradation of absorption performance, severely limiting their reliable application in terahertz radar stealth countermeasures. To overcome this challenge, we propose a flexible and tunable terahertz broadband absorber based on a three patterned monolayer graphene layers and systematically investigate its strain-adaptive mechanism. In its original undeformed state, the absorber demonstrates excellent broadband absorption characteristics for both transverse electric (TE) and transverse magnetic (TM) waves, with absorption bandwidths (absorptance > 90%) reaching 1.99 THz and 2.02 THz, respectively. This study further reveals that in-plane mechanical deformation induces a systematic but oppositely directed frequency shift in the absorption spectra of the TE and TM modes. To counteract this performance detuning, we innovatively propose a layer-specific electrical compensation strategy. By precisely adjusting the chemical potentials of the three patterned monolayer graphene layers, it is possible not only to independently restore the absorption performance of the TE and TM modes but also to achieve a unified solution capable of simultaneously recovering the absorption performance of both polarization modes under compressive or tensile deformations of up to 20%. This research provides a robust and practical approach for realizing flexible terahertz absorbing surfaces that operate stably under complex mechanical conditions.
Keywords:
Terahertz
Graphene
In-plane deformation
Electrical reconfiguration
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