On-Chip Multidimensional Manipulation of Far-Field Radiation with Guided Wave-Driven Metasurfaces

Miniaturization and integration of multiple optical components in one chip are important trends in the future development of optical chips. Despite various on-chip multifunctional metasurfaces having been proposed, simultaneously manipulating the polarization and wavefront of far-field radiation still remains a challenge. Here, a novel approach to simultaneously realize on-chip polarization and wavefront manipulation of far-field radiation with guided wave-driven geometric metasurfaces is theoretically proposed and experimentally demonstrated. Various polarized beams with controllable radiation angles can be generated by maneuvering phase gradients and far-field interferences of meta-atoms. The phase and amplitude of off-chip radiation can be tailored all at once by altering the rotation angles and positions of each meta-atom. As a proof of concept, a guided wave-driven metalens and four different on-chip polarization generators are fabricated and characterized. These on-chip devices work at broadband and can realize mode-dependent beam deflection. This study provides a practical route toward on-chip multidimensional control of far-field radiation, which could support a further step in the development of photonic integrated circuits, wearable near-eye displays, and optical information processing devices, just to name a few.