ABSTRACT A planar metasurface is designed to replace the traditional three-dimensional axicon lens to generate a nondiffraction in normal direction at first. Then, to generate Bessel beams that can be tilted in any direction, we add the phase distribution information derived from the generalized Snell’s reflection law to the traditional axicon phase distribution formula. Finally, a metasurface with a nondiffracting beam inclined to φ of 30° and θ of 30° is designed by employing the final modified phase information for demonstration. The simulated results indicate the effectiveness and robustness of the proposed theory and design.

中文翻译：

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使用超表面生成具有任意聚焦方向的非衍射光束

摘要 平面超表面旨在取代传统的三维轴棱锥透镜，首先在法线方向产生非衍射。然后，为了生成可以向任何方向倾斜的贝塞尔光束，我们将根据广义斯涅尔反射定律导出的相位分布信息添加到传统轴棱镜相位分布公式中。最后，通过使用最终修改后的相位信息进行演示，设计了一个具有 30° φ 和 30° θ 的非衍射光束的超表面。仿真结果表明了所提出的理论和设计的有效性和鲁棒性。