可拉伸器件中太赫兹波特性的主动控制对于涉及大机械变形或拉伸的先进太赫兹应用至关重要。将金属超表面与弹性薄膜聚二甲基硅氧烷相结合，设计并研制了基于不同微观机理的双带太赫兹波段主动控制器件。利用金属与弹性薄膜在拉伸作用下的形变失配，通过周期敏感的十字结构超表面实现了双带调制效果。在36%的拉伸下，利用偶极子模式和晶格模式分别在1.26 THz和2.41 THz处实现了调制深度为90%和78%的双频带调制。通过晶格模式进行的调制工作频率具有较大的动态范围，可以从2.41 THz调谐到1.85 THz。由于电偶极子谐振模式和周期性晶格谐振模式的机制彼此独立，因此可以独立地设计两个谐振频率，从而在几何上调节双带调制器的频率间隔。提出的可拉伸超表面制备简单，具有强度调制深度大，频率调谐范围广的优点，既能用于太赫兹波的主动控制，也能用于被动式的位移传感。

Active control of terahertz wave characteristics in stretchable devices is essential for advanced terahertz applications involving large mechanical deformation or stretching. Here, a dual band terahertz active control device based on different mechanisms was designed and fabricated by combining metal metasurface with elastic film polydimethylsiloxane. Based on the deformation mismatch between metal and elastic film under tension, the double band modulation effect was realized by using the periodically sensitive cross structure metasurface. Under 36% deformation, the dipole mode and the lattice resonance mode were exploited to experimentally achieve dual-band modulation with a modulation depth of 90% and a modulation depth of 78% at 1.26 THz and 2.41 THz, respectively. The operating frequency through the lattice mode had a large dynamic range, which could be tuned from 2.41 THz to 1.85 THz. Since the mechanisms of the electric dipole resonance mode and the periodic lattice resonance mode were independent from each other, the two resonance frequencies were designed independently, which allowed the frequency interval of the dual-band modulation to be geometrically adjustable. The stretchable metasurface presented in this paper is simple to prepare, and has the advantages of large intensity modulation depth and wide frequency tuning range. It can be used not only in active control of terahertz wave, but also in passive displacement sensing.