Energy-Tailorable Spin-Selective Multifunctional Metasurfaces with Full Fourier Components.Compact integrated multifunctional metasurface that can deal with concurrent tasks represent one of the most profound research fields in modern optics.  Such integration is expected to have a striking impact on minimized optical systems in applications such as optical communication and computation.  However, arbitrary multifunctional spin-selective design with precise energy configuration in each channel is still a challenge, and suffers from intrinsic noise and complex designs.  Here, a design principle is proposed to realize energy tailorable multifunctional metasurfaces, in which the functionalities can be arbitrarily designed if the channels have no or weak interference in k-space.  A design strategy is demostrated here with high-efficiency dielectric nanopillars that can modulate full Fourier components of the optical field.  The spin-selective behavior of the dielectric metasurfaces is also investigated, which originates from the group effect introduced by numerous nanopillar arrays.  This approach provides straightforward rules to control the functionality channels in the integrated metasurfaces, and paves the way for efficient concurrent optical communication.
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