Optically transparent and microwave diffusion coding metasurface by utilizing ultrathin silver films.
Optically transparent and microwave diffusion coding metasurface by utilizing ultrathin silver films.
复制标题
DOI：
10.1364/oe.442512
复制
发表时间：
2021-10
期刊：
影响因子：
3.8
通讯作者：
Heyan Wang;Yujia Sun;Yilei Zhang;B. Luo;Zhibo Cao;Yunfei Liu;Zhengang Lu;Jiubin Tan
中科院分区：
文献类型：
--
作者：
Heyan Wang;Yujia Sun;Yilei Zhang;B. Luo;Zhibo Cao;Yunfei Liu;Zhengang Lu;Jiubin Tan
在过去的几年里，利用有效的介质参数来控制电磁波的人造超材料取得了巨大的成功。本文提出了一种利用亚波长编码单元合理布局的编码元表面，通过优化方法实现宽带微波低镜面反射和均匀后向散射的方案。我们提出了具有高透明度的编码元件的基础上掺杂银，这是能够产生大的相位差（180°）在一个宽的频率范围内通过设计几何结构。编码超颖表面的电磁扩散源于各个方向的反射波的相消干涉。数值模拟和实验结果表明，在12 ~ 18 GHz的频率范围内实现了低反射，对横向电场和横向磁场的角度不灵敏度高达±40°。此外，编码超颖表面的优异可见光透明度对于各种微波和光学应用（诸如电子监视、电磁干扰屏蔽和雷达截面减小）是有希望的。
The past few years have witnessed the great success of artificial metamaterials with effective medium parameters to control electromagnetic waves. Herein, we present a scheme to achieve broadband microwave low specular reflection with uniform backward scattering by using a coding metasurface, which is composed of a rational layout of subwavelength coding elements, via an optimization method. We propose coding elements with high transparency based on ultrathin doped silver, which are capable of generating large phase differences (∼180°) over a wide frequency range by designing geometric structures. The electromagnetic diffusion of the coding metasurface originates from the destructive interference of the reflected waves in various directions. Numerical simulations and experimental results demonstrate that low reflection is achieved from 12 to 18 GHz with a high angular insensitivity of up to ±40° for both transverse electric and transverse magnetic polarizations. Furthermore, the excellent visible transparency of the encoding metasurface is promising for various microwave and optical applications such as electronic surveillance, electromagnetic interference shielding, and radar cross-section reduction.