Frequency‐Controlled Focusing Using Achromatic Metasurface,Advanced Optical Materials

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Frequency‐Controlled Focusing Using Achromatic Metasurface
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2020-11-09 , DOI: 10.1002/adom.202001311
Huan Lu _{1,

2,

3} , Bin Zheng _{1,

2,

3} , Tong Cai _{1,

2,

3} , Chao Qian _{1,

2,

3} , Yihao Yang ₄ , Zuojia Wang _{1,

2,

3} , Hongsheng Chen _{1,

2,

3}

Affiliation

Frequency‐controlled metasurfaces have attracted significant attention for a variety of applications, such as radar imaging and 5G communication, owing to their small size and low cost. However, due to the inherent material dispersion of these devices, bandwidth is an essential requirement for their controlling their wavefront. To evaluate the broadband performance of frequency‐controlled metasurface focusing systems, a multiresonant model is used to achieve controlled manipulation of frequency‐splitting and focusing reflective metasurface; further, the transition from broadband disorder scattering to user‐desired reflection is obtained. It is shown that the focusing position can be controlled by the careful design of each unit cell. As a proof of concept, a broadband focusing metasurface with frequency‐splitting effect over the entire X band, i.e., 8–12 GHz, is designed and experimentally demonstrated, which can control the position of focal spots with different wavelengths by its achromatic and reflective characteristics. It is believed that the proposed metasurface will provide useful insights for wavefront manipulation in broadband and chromatically corrected imaging systems.

中文翻译：

使用消色差超表面进行频率控制的聚焦

频率控制的超颖表面由于其体积小且价格低廉，已在各种应用中引起了广泛的关注，例如雷达成像和5G通信。但是，由于这些设备固有的材料分散性，带宽是控制其波前的基本要求。为了评估频率控制的超表面聚焦系统的宽带性能，使用了一个多共振模型来实现对频率分离和聚焦反射性超表面的控制。此外，获得了从宽带无序散射到用户所需反射的过渡。结果表明，可以通过精心设计每个单元电池来控制聚焦位置。作为概念证明，宽带聚焦超表面在整个X波段上具有分频效果，即设计并通过实验演示了8-12 GHz，它可以通过其消色差和反射特性来控制具有不同波长的焦点的位置。相信提出的超颖表面将为宽带和经色彩校正的成像系统中的波前操纵提供有用的见解。

更新日期：2021-01-04

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