Spin-Encoded Wavelength-Direction Multitasking Full-space metasurface

Multifunctional wavefront manipulations of waves is essential for high-capacity communications, which is still infancy. We employed vertically cascaded quadrangular patches and crossbars to integrate both geometric and dynamic phases and realize spin-encoded full-space wavefront control. A proof-of-concept metasurface with four-port wavefront manipulations is numerically and experimentally demonstrated, exhibiting distinct functionalities including spin- and frequency-dependent light focusing, quad-beam radiation, anomalous reflections, and Bessel beam generation. Our finding of full-space multifunctional metasurfaces would be vital for multiple-input-multiple-output system and sets up a solid platform for arbitrary spin-encoded full-space integrated devices.