Fatigue‐Free Mechanically Tunable Terahertz Metamaterial Absorber with High Modulation Capability Based on PVDF‐MoS ₂ Piezoelectric Films

Abstract With the growing advancement in terahertz (THz) research, the increasing diversity of applications and complex electromagnetic environments have intensified the demand for tunable terahertz metamaterial absorber (TMA). However, most existing tunable TMAs suffer from limited tunability and poor durability due to the reliance on stimuli‐responsive materials and detrimental modulation strategies. This work proposes a sandwich‐structured mechanically tunable TMA based on PVDF‐MoS ₂ piezoelectric film (PM‐TMA). Attributed to the piezoelectric‐based tuning strategy, the PM‐TMA enables noncontact mechanical tuning, effectively avoiding fatigue damage and enhancing device durability. Both simulation and experimental results demonstrate that absorption peaks of the PM‐TMA redshift progressively with increasing mechanical stimulation frequency. Additionally, a higher MoS ₂ doping concentration in the PVDF‐MoS ₂ film further shifts the absorption band to lower frequencies, thereby broadening the tunable frequency range. This dual synergistic regulation mechanism enables broadband control of the absorption peaks. Moreover, the device offers excellent durability due to the nondirective mechanical stimulation. In summary, the developed PM‐TMA achieves uniform frequency tuning of near‐perfect absorption peaks through a facile strategy, while exhibiting fatigue‐free operation, high tunable capability, and strong versatility. This work provides an efficient, universal, and sustainable solution for TMAs, with significant application prospects in THz shielding, communication, and sensing technologies.