An all-dielectric metamaterial absorber consisting of water arrays encapsulated in polytetrafluoroethylene (PTFE) container is proposed. The absorber can afford the absorptivity exceeding 90% over the broadband frequency band ranging from 0.3 THz to 1.5 THz and the relative absorption bandwidth is up to 133%. The distributions of electric field and magnetic field as well as power loss density are analyzed and reveal that magnetic resonance at the top border between water and PTFE plays a more important role than electric resonance and most of the incident power is dissipated here. Furthermore, the absorber has excellent thermal stability as well as insensitivity of polarization and incident-angle. Endowed with these excellent performance as well as the advantage of low cost and eco-friendly materials, the proposed absorber can be expected to find extensive applications in terahertz domain.

提出了一种由封装在聚四氟乙烯 (PTFE) 容器中的水阵列组成的全介电超材料吸收器。该吸收体在 0.3 THz 至 1.5 THz 的宽带频带内具有超过 90% 的吸收率，相对吸收带宽高达 133%。对电场和磁场的分布以及功率损耗密度进行了分析，结果表明水和 PTFE 顶部边界处的磁共振比电共振起更重要的作用，并且大部分入射功率都在此处耗散。此外，吸收体具有优异的热稳定性以及偏振和入射角的不敏感性。具备这些优异的性能以及低成本、环保材料的优势，