Achieving simultaneous amplitude and phase control is crucial in various spin‐selective optical applications, particularly for chiral mirrors that exhibit distinct responses when illuminated by orthogonal circularly polarized waves. However, conventional chiral metasurface approaches for amplitude manipulation can only be implemented by adjusting absorption, which limits the bandwidth due to the dispersion nature of the meta‐structure and cannot ensure that the chiral mirror output only one circular polarization component with independent amplitude and phase manipulation at multi‐polarization incidence. Here, an interference‐mechanism‐assisted methodology is proposed for broadband chiral meta‐mirrors with independent control over amplitude and phase. Such controls are achieved by simply setting the rotation angle of each meta‐atom in the integrated quad‐atom structure. The rotation angle of each meta‐atom and the difference between adjacent meta‐atoms rotation angles provide flexible degrees of freedom for controlling phase and amplitude, respectively. Notably, this mechanism stemming from the Pancharatnam‐Berry phase allows for wideband operation due to its dispersion‐free nature of phase control. As proof‐of‐principle demonstrations, numerically verify a series of amplitude‐tailorable phase‐gradient meta‐mirrors and experimentally demonstrate a broadband chiral Airy beam generator. This method offers a straightforward solution for spin‐selective amplitude/phase manipulation which may have the potential to advance the engineering application of chiral metasurfaces.

中文翻译：

---

使用宽带手性元镜进行干扰辅助独立幅度和相位操纵

实现同步振幅和相位控制在各种自旋选择性光学应用中至关重要，特别是对于在正交圆偏振波照射时表现出不同响应的手性镜。然而，传统的手性超表面振幅操纵方法只能通过调节吸收来实现，由于超结构的色散性质，这限制了带宽，并且不能确保手性镜仅输出一个具有独立振幅和相位操纵的圆偏振分量。在多极化入射时。在这里，提出了一种干涉机制辅助方法，用于具有独立控制幅度和相位的宽带手性元镜。这种控制是通过简单地设置集成四原子结构中每个元原子的旋转角度来实现的。每个元原子的旋转角度和相邻元原子旋转角度的差异分别为控制相位和振幅提供了灵活的自由度。值得注意的是，这种源自 Pancharatnam-Berry 相的机制由于其相位控制的无色散性质而允许宽带操作。作为原理验证演示，对一系列幅度可定制的相位梯度元镜进行数值验证，并通过实验演示宽带手性艾里光束发生器。该方法为自旋选择性幅度/相位操纵提供了一种简单的解决方案，可能有潜力推进手性超表面的工程应用。