Deterministic Approach to Achieve Broadband Polarization-Independent Diffusive Scatterings Based on Metasurfaces,ACS Photonics

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Deterministic Approach to Achieve Broadband Polarization-Independent Diffusive Scatterings Based on Metasurfaces
ACS Photonics ( IF 6.5 ) Pub Date : 2017-11-09 00:00:00 , DOI: 10.1021/acsphotonics.7b01036
He-Xiu Xu _{1,

2,

3} , Shaojie Ma ₁ , Xiaohui Ling _{1,

3} , Xiao-Kuan Zhang ₂ , Shiwei Tang ₄ , Tong Cai _{1,

2} , Shulin Sun ₅ , Qiong He _{1,

6} , Lei Zhou _{1,

6}

Affiliation

Diffusive scatterings of electromagnetic (EM) waves by a thin screen are important in many applications, but available approaches cannot ensure uniform angular distributions of low-intensity scatterings without time-consuming optimizations. Here, we propose a robust and deterministic approach to design metasurfaces to achieve polarization-independent diffusive scatterings of EM waves within an ultrabroad frequency band and for wide-range of incident angles. Our key idea is to use high-efficiency Pancharatnam–Berry meta-atoms to form subarrays exhibiting focusing reflection-phase profiles, that can guarantee nearly uniform diffusive scatterings for arbitrarily polarized EM waves. As an illustration, we design and fabricate two metasurfaces and experimentally characterize their wave-diffusion properties in C, X, and Ku bands. Theoretical, numerical and experimental results demonstrate that our approach can diffuse the incident energy much more uniformly than available approaches based on the uniform-phase subarrays, thanks to the intrinsic wave-diffusion capabilities of the focusing-phase subarrays. The −7 dB fractional bandwidth is measured as 88.3% and the diffusive scattering behavior can be preserved up to 60° off-normal incidence irrespective of incident polarizations. Our approach, simple and robust, can help realize stealth applications under bistatic detections.

中文翻译：

基于超表面实现宽带偏振无关扩散散射的确定性方法

薄屏对电磁波的扩散散射在许多应用中很重要，但是如果没有费时的优化，可用的方法就无法确保低强度散射的均匀角度分布。在这里，我们提出了一种鲁棒且确定性的方法来设计超颖表面，以实现超宽带频带内和宽入射角范围内电磁波的偏振无关扩散散射。我们的关键思想是使用高效的Pancharatnam–Berry亚原子形成具有聚焦反射相位分布的子阵列，该子阵列可以确保任意极化的EM波几乎均匀地扩散。作为说明，我们设计和制造了两个超颖表面，并通过实验表征了它们在C，X和Ku波段的波扩散特性。理论上数值和实验结果表明，由于聚焦相子阵列具有固有的波扩散能力，因此与基于均匀相子阵列的方法相比，我们的方法可以更均匀地扩散入射能量。-7 dB的分数带宽测得为88.3％，无论入射偏振如何，扩散散射行为都可以保持在偏离法线入射60°的范围内。我们的方法简单而强大，可以帮助在双基地检测下实现隐身应用。3％的散射扩散行为可以保持在偏离法线入射60°的范围内，而与入射极化无关。我们的方法简单而强大，可以帮助在双基地检测下实现隐身应用。3％的散射扩散行为可以保持在偏离法线入射60°的范围内，而与入射极化无关。我们的方法简单而强大，可以帮助在双基地检测下实现隐身应用。

更新日期：2017-11-09

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