Axisymmetric extension of beam steering angles by metasurfaces is of great interest due to its potential application in extending the angular scan range of existing phased arrays. This angle-multiplexed manipulation functionality requires anti-symmetrically angle-dispersive phase gradient, as well as anti-symmetric angular phase dispersion over continuous incident angles, which is difficult to be implemented by existing metasurfaces. In this work, a series of meta-atoms with asymmetric structures are developed to achieve the required phase response. Based on the asymmetric meta-atoms, an angle-dispersive metasurface for axisymmetric beam steering of transmitted transverse-magnetic (TM) wave is designed, fabricated and tested, whose simulation and experimental results demonstrate the axisymmetric extension capability of beam steering angles from -53° ≤ θ_i ≤ 53° to almost -90° ≤ θ_t ≤ 90°.

中文翻译：

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TM偏振角色散超表面，用于光束转向角的轴对称扩展

由于其潜在用途可用于扩展现有相控阵的角度扫描范围，因此超颖表面对光束转向角的轴对称扩展非常感兴趣。这种角度多路复用操作功能需要反对称的角度分散相位梯度以及连续入射角上的反对称角度相位分散，而现有的超表面很难实现。在这项工作中，开发了一系列具有不对称结构的亚原子，以实现所需的相位响应。基于不对称的亚原子，设计，制造和测试了用于透射横波（TM）轴对称光束转向的角分散形亚表面，θ_我≤53°至几乎-90°≤ θ_吨≤90°。