Liquid-Metal-Enabled Flexible Metasurface with Self-Healing Characteristics
Liquid-Metal-Enabled Flexible Metasurface with Self-Healing Characteristics
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DOI：
10.1002/admi.202102141
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发表时间：
2022-03-08
影响因子：
5.4
通讯作者：
Lee, Jeong-Bong
中科院分区：
文献类型：
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作者：
Mitra, Arkadeep;Xu, Kevin;Lee, Jeong-Bong
报道了一种工作在x波段（8-12 GHz）的柔性自修复超表面，该超表面采用聚二甲基硅氧烷（PDMS）封装镓基液态金属。设计了一个中心频率为9.82 GHz的带阻超表面，该带阻超表面采用了围绕耶路撒冷十字两端的浮动贴片。在PDMS中进行了大规模（高达10 × 10阵列）的超表面图像化，并采用超低压真空填充的快速制造方法在PDMS中产生液态金属的平行封装。制备的超表面具有物理柔韧性，并对其柔韧性进行了反复测试，包括可弯曲性、可拉伸性（高达89.13%）、可扭转性和可折叠性。在波导和自由空间环境下测量了柔性超表面的传输特性，发现带阻中心频率与设计吻合较好。柔性超表面还测试了其可修复性和自修复特性。将超表面的某一部分部分或全部切割，通过施加外部压力或使用卡普顿胶带/UV胶对超表面的部分/全部切割部分进行修复。修复后的超表面显示出原始传输特性的恢复，频率和幅度的变化最小。
A flexible self-healing metasurface using gallium-based liquid metal encapsulated in polydimethylsiloxane (PDMS) operating in the X-band (8-12 GHz) is reported. A band-stop metasurface with center frequency at 9.82 GHz is designed using floating patches surrounding the respective end cap of a Jerusalem cross. A large-scale (up to 10 x 10 array) metasurface is patterned in PDMS and a rapid manufacturing method of vacuum filling using ultra-low pressure is used to yield parallel encapsulation of liquid metal in PDMS. The fabricated metasurface is physically flexible and its flexibility is repeatedly tested for bendability, stretchability (up to approximate to 89.13%), twistability, and foldability. Transmission characteristics of the flexible metasurface are measured in waveguide and free-space environments and it is found that the band-stop center frequency agrees well with the design. The flexible metasurface also is tested for its repairability and self-healing characteristics. The metasurface is partially or fully cut at certain part and the partial/full cut part of the metasurface is repaired by applying external pressure or using Kapton tape/UV glue. Those repaired metasurfaces show restoration of original transmission characteristics with minimal shift in frequency and magnitude.