Metasurfaces provide a compact, flexible, and efficient platform to manipulate the electromagnetic waves. However, chromatic aberration imposes severe restrictions on their applications in broadband polarization control. Here, we propose a broadband achromatic methodology to implement polarization-controlled multifunctional metadevices in mid-wavelength infrared with birefringent meta-atoms. We demonstrate the generation of polarization-controlled and achromatically on-axis focused optical vortex beams with diffraction-limited focal spots and switchable topological charge (L^∥ = 0 and L^⊥ = 2). Besides, we further implement broadband achromatic polarization beamsplitter with high polarization isolation (extinction ratio up to 21). The adoption of all-silicon configuration not only facilitates the integration with CMOS technology but also endows the polarization multiplexing meta-atoms with broad phase dispersion coverage, ensuring the large size and high performance of the metadevices. Compared with the state-of-the-art chromatic aberration-restricted polarization-controlled metadevices, our work represents a substantial advance and a step toward practical applications.

超表面提供了一种紧凑，灵活且高效的平台来操纵电磁波。然而，色差对其在宽带偏振控制中的应用施加了严格的限制。在这里，我们提出了一种宽带消色差方法，以在具有双折射元原子的中波长红外中实现偏振控制的多功能元设备。我们证明的偏振控制的消色差和在轴聚焦光学涡旋具有衍射极限焦斑和可切换拓扑电荷（光束产生大号^∥ = 0和大号^⊥= 2）。此外，我们进一步实现了具有高偏振隔离度（消光比高达21）的宽带消色差偏振分束器。全硅配置的采用不仅促进了与CMOS技术的集成，而且使偏振复用超原子具有广泛的相散覆盖范围，从而确保了超大型器件的高性能。与最新的色差限制偏振控制元设备相比，我们的工作代表了实质性的进步，并朝着实际应用迈出了一步。