High-efficiency dielectric metasurfaces for simultaneously engineering polarization and wavefront

Emerging metasurfaces are capable of arbitrarily reshaping the incident light, including polarization and wavefront, thereby enabling highly compact optical devices, such as meta-deflectors, meta-waveplates, and meta-lenses. However, the miniaturization of metasurface-enabled integrated devices still suffers from bulky dimensions and propagation loss. In this work, based on crystalline silicon, we report a novel approach of high-efficiency metasurfaces for simultaneously manipulating the polarization and wavefront of incident light at the telecommunication wavelength, from which an arbitrary spatial field distribution of the polarization direction and wavefront can be achieved. For verification, four proof-of-concept dual-functional metasurfaces are numerically designed with high efficiency of more than 70%, including quarter-waveplate/deflector, half-waveplate/deflector, lens/quarter-waveplate, and lens/half-waveplate. Such compact dual-functional metasurfaces offer a new pathway for the future miniaturization of integrated optical devices.