Chen Lei, Ruan Ying, Luo Si Si, Ye Fu Ju, Cui Hao Yang
College of Electronics and Information Engineering, Shanghai University of Electric Power, Shanghai 200090, China.
Micromachines (Basel). 2020 Nov 24;11(12):1032. doi: 10.3390/mi11121032.
In this paper, we present a flexible, breathable and optically transparent metasurface with ultra-wideband absorption. The designed double layer of indium tin oxide (ITO) films with specific carved structure realizes absorption and electromagnetic (EM) isolation in dual-polarization, as well as good air permeability. Under the illumination of x- and y-polarization incidence, the metasurface has low reflectivity and transmission from about 2 to 18 GHz. By employing ITO film based on polyethylene terephthalate (PET), the presented metasurface also processes the excellent flexibility and optically transparency, which can be utilized for wearable device application. In addition, the dual-layer design enables mechanically-reconfigurable property of the metasurface. The transmission and reflection coefficients in two polarizations show distinct difference when arranging the different relevant positions of two layers of the metasurface. A sample with 14*14 elements is designed, fabricated and measured, showing good agreement with the simulation results. We envision this work has various potentials in the wearable costume which demands both EM absorption and isolation.
在本文中，我们展示了一种具有超宽带吸收特性的柔性、透气且光学透明的超表面。设计的具有特定雕刻结构的双层氧化铟锡（ITO）薄膜实现了双极化吸收和电磁（EM）隔离，以及良好的透气性。在x极化和y极化入射光照下，该超表面在约2至18 GHz范围内具有低反射率和低透射率。通过采用基于聚对苯二甲酸乙二酯（PET）的ITO薄膜，所展示的超表面还具有出色的柔韧性和光学透明性，可用于可穿戴设备应用。此外，双层设计使超表面具有机械可重构特性。当排列超表面两层的不同相关位置时，两个极化方向的传输系数和反射系数显示出明显差异。设计、制作并测量了一个具有14×14个单元的样品，其结果与模拟结果吻合良好。我们设想这项工作在既需要电磁吸收又需要电磁隔离的可穿戴服装领域具有多种潜力。
