Geometric metasurfaces primarily follow the physical mechanism of Pancharatnam–Berry (PB) phases, empowering wavefront control of cross‐polarized reflective/transmissive light components. However, inherently accompanying the cross‐polarized components, the copolarized output components have not been attempted in parallel in existing works. Here, a general method is proposed to construct phase‐modulated metasurfaces for implementing functionalities separately in co‐ and cross‐polarized output fields under circularly polarized (CP) incidence, which is impossible to achieve with solely a geometric phase. By introducing a propagation phase as an additional degree of freedom, the electromagnetic (EM) energy carried by co‐ and cross‐polarized transmitted fields can be fully phase‐modulated with independent wavefronts. Under one CP incidence, a metasurface for separate functionalities with controllable energy repartition is verified by simulations and proof‐of‐principle microwave experiments. A variety of applications can be readily expected in spin‐selective optics, spin‐Hall metasurfaces, and multitasked metasurfaces operating in both reflective and transmissive modes.

中文翻译：

---

完全相位调制的超表面作为能量可控的圆偏振路由器

几何形超表面主要遵循Pancharatnam–Berry（PB）相的物理机制，从而能够对交叉偏振的反射/透射光分量进行波前控制。但是，固有地伴随着交叉极化分量，在现有工作中并未并行尝试同极化输出分量。在此，提出了一种通用方法来构造相位调制的超曲面，以在圆极化（CP）入射下分别在共极化和交叉极化输出场中实现功能，而仅凭几何相位是无法实现的。通过引入传播相位作为附加的自由度，由同极化和交叉极化的传输场携带的电磁（EM）能量可以通过独立的波前进行完全调相。在一次CP事件中，通过模拟和原理证明微波实验验证了具有可控制的能量分配的单独功能的超表面。自旋选择光学，自旋霍尔超颖表面和以反射和透射模式工作的多任务超颖表面很容易获得各种应用。