Ultrawideband Spin‐Decoupled Coding Metasurface for Independent Dual‐Channel Wavefront Tailoring,Annalen Der Physik

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Ultrawideband Spin‐Decoupled Coding Metasurface for Independent Dual‐Channel Wavefront Tailoring
Annalen Der Physik ( IF 2.2 ) Pub Date : 2020-02-16 , DOI: 10.1002/andp.201900472
Wen‐Long Guo _{1,

2} , Guang‐Ming Wang ₂ , Xin‐Yao Luo ₁ , Hai‐Sheng Hou ₂ , Ke Chen ₁ , Yijun Feng ₁

Affiliation

Achieving distinct functionalities for electromagnetic (EM) waves with opposite handedness in a broad frequency range is highly desirable and essential for modern wireless communications and radar stealth. However, available functional meta‐devices still suffer from the issues of locked functionalities or spin‐decoupled properties but with limited bandwidth. Here, a spin‐decoupled coding metasurface is presented for achieving independently spin‐controlled functionalities with high efficiency in an ultrawide frequency band. By synthesizing the Jones matrix, it is predicted that two half‐wave plates with a phase difference of 90° can form a 1‐bit coding metasurface operating for orthogonal spins independently. As proofs of concept, two meta‐devices are implemented by the metasurface in the microwave region. The first meta‐device performs as a spin‐decoupled beam deflector while the second one shows an ability to generate spin‐decoupled multi‐beams carrying desired orbital angular momentums. Both of the designed meta‐devices can operate in the whole band of 7.5–18.5 GHz (with relative bandwidth of 80%), which, to the best knowledge, is so far the broadest bandwidth that can be achieved by spin‐decoupled metasurfaces. This may trigger interest and open opportunities for advanced functional meta‐devices in practical applications, for example, multichannel metasurface antennas, or multifunctional low‐scattering devices in microwave region.

中文翻译：

超宽带自耦解耦编码元表面，用于独立的双通道波前定制

在广泛的频率范围内实现具有相反手性的电磁波（EM）的独特功能是非常理想的，并且对于现代无线通信和雷达隐身至关重要。但是，可用的功能性元设备仍然遭受功能锁定或自旋解耦属性的问题，但是带宽有限。在此，提出了一种自旋解耦编码超表面，用于在超宽频带内高效实现独立的自旋控制功能。通过合成琼斯矩阵，可以预测两个相位差为90°的半波片可以形成独立于正交旋转的1位编码超表面。作为概念证明，微波区域中的超表面实现了两个元设备。第一个元设备用作自旋解耦的光束偏转器，而第二个元设备具有生成带有所需轨道角动量的自旋解耦的多光束的能力。两种设计的元设备都可以在7.5-18.5 GHz的整个频带内工作（相对带宽为80％），据目前所知，这是迄今为止自旋解耦的超颖表面可以实现的最宽带宽。在实际应用中，这可能会引发对高级功能元设备的兴趣和开放机会，例如，多通道超表面天线或微波区域中的多功能低散射设备。5 GHz（相对带宽为80％），就目前所知，这是自旋去耦超颖表面可以实现的最宽带宽。在实际应用中，这可能会引发对高级功能性元设备的兴趣和开放机会，例如，多通道超表面天线或微波区域中的多功能低散射设备。5 GHz（相对带宽为80％），就目前所知，这是自旋解耦的超颖表面可以实现的最宽带宽。在实际应用中，这可能会引发对高级功能性元设备的兴趣和开放机会，例如，多通道超表面天线或微波区域中的多功能低散射设备。

更新日期：2020-02-16

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