Due to its unbounded and orthogonal modes, the orbital angular momentum (OAM) is regarded as a key optical degree of freedom (DoF) for future information processing with ultra-high capacity and speed. Although the manipulation of OAM based on metasurfaces has brought about great achievements in various fields, such manipulation currently remains at single-DoF level, which means the multiplexed manipulation of OAM with other optical DoFs is still lacking, greatly hampering the application of OAM beams and advancement of metasurfaces. In order to overcome this challenge, we propose the idea of multiplexed coherent pixel (MCP) for metasurfaces. This approach enables the manipulation of arbitrary complex-amplitude under incident lights of both plane and OAM waves, on the basis of which we have realized the multiplexed DoF control of OAM and wavelength. As a result, the MCP method expands the types of incident lights which can be simultaneously responded by metasurfaces, enriches the information processing capability of metasurfaces, and creates applications of information encryption and OAM demultiplexer. Our findings not only provide means for the design of high-security and high-capacity metasurfaces, but also raise the control and application level of OAM, offering great potential for multifunctional nanophotonic devices in the future.

由于其无界和正交模式，轨道角动量（OAM）被视为未来超高容量和速度信息处理的关键光学自由度（DoF）。尽管基于超表面的OAM操控在各个领域都取得了巨大的成就，但这种操控目前还停留在单自由度水平，这意味着OAM与其他光学自由度的复用操控仍然缺乏，极大地阻碍了OAM光束和光学的应用。超表面的进步。为了克服这一挑战，我们提出了超表面复用相干像素（MCP）的想法。该方法实现了平面波和OAM波入射光下任意复振幅的操控，在此基础上我们实现了OAM和波长的复用DoF控制。从而，MCP方法扩展了超表面可同时响应的入射光类型，丰富了超表面的信息处理能力，并创造了信息加密和OAM解复用器的应用。我们的研究结果不仅为高安全性和高容量超表面的设计提供了手段，而且提高了OAM的控制和应用水平，为未来多功能纳米光子器件提供了巨大的潜力。