Metasurfaces enable the design of optical elements by engineering the wavefront of light at the subwavelength scale. Due to their ultrathin and compact characteristics, metasurfaces possess great potential to integrate multiple functions in optoelectronic systems for optical device miniaturisation. However, current research based on multiplexing in the 2D plane has not fully utilised the capabilities of metasurfaces for multi-tasking applications. Here, we demonstrate a 3D-integrated metasurface device by stacking a hologram metasurface on a monolithic Fabry–Pérot cavity-based colour filter microarray to simultaneously achieve low-crosstalk, polarisation-independent, high-efficiency, full-colour holography, and microprint. The dual functions of the device outline a novel scheme for data recording, security encryption, colour displays, and information processing. Our 3D integration concept can be extended to achieve multi-tasking flat optical systems by including a variety of functional metasurface layers, such as polarizers, metalenses, and others.

超表面通过在亚波长范围内工程化光的波阵面来实现光学元件的设计。由于超薄和紧凑的特性，超颖表面具有将多种功能集成到光电系统中以实现光学设备小型化的巨大潜力。但是，当前基于2D平面中的多路复用的研究尚未完全利用超颖表面的功能来进行多任务应用。在这里，我们通过将全息超颖表面堆叠在基于单片Fabry-Pérot腔的彩色滤光片微阵列上，同时实现低串扰，偏振无关，高效，全色全息和微缩印刷，来演示3D集成超颖表面设备。该设备的双重功能概述了一种新颖的方案，用于数据记录，安全加密，彩色显示，和信息处理。我们的3D集成概念可以扩展为通过包含各种功能性超表面层（例如偏振器，metalenses等）来实现多任务平面光学系统。