An optical phased array(OPA)featuring all-solid-state beam steering is a promising component for light detection and ranging(LiDAR).There exists an increasing demand for panoramic perception and rapid target recogniti...An optical phased array(OPA)featuring all-solid-state beam steering is a promising component for light detection and ranging(LiDAR).There exists an increasing demand for panoramic perception and rapid target recognition in intricate LiDAR applications,such as security systems and self-driving vehicles.However,the majority of existing OPA approaches suffer from limitations in field of view(FOV)and do not explore parallel scanning,thus restricting their potential utility.Here,we combine a two-dimensional(2D)grating with an FOV-synthetization concept to design a silicon-based top-facing OPA for realizing a wide cone-shaped 360°FOV.By utilizing four OPA units sharing the 2D grating as a single emitter,four laser beams are simultaneously emitted upwards and manipulated to scan distinct regions,demonstrating seamless beam steering within the lateral 360°range.Furthermore,a frequency-modulated dissipative Kerr-soliton(DKS)microcomb is applied to the proposed multi-beam OPA,exhibiting its capability in large-scale parallel multi-target coherent detection.The comb lines are spatially dispersed with a 2D grating and separately measure distances and velocities in parallel,significantly enhancing the parallelism.The results showcase a ranging precision of 1 cm and velocimetry errors of less than 0.5 cm/s.This approach provides an alternative solution for LiDAR with an ultra-wide FOV and massively parallel multi-target detection capability.展开更多
基金National Key Research and Development Program of China(2022YFA1404001)National Natural Science Foundation of China(62135004)Key Research and Development Program of Hubei Province(2021BAA005)。
文摘An optical phased array(OPA)featuring all-solid-state beam steering is a promising component for light detection and ranging(LiDAR).There exists an increasing demand for panoramic perception and rapid target recognition in intricate LiDAR applications,such as security systems and self-driving vehicles.However,the majority of existing OPA approaches suffer from limitations in field of view(FOV)and do not explore parallel scanning,thus restricting their potential utility.Here,we combine a two-dimensional(2D)grating with an FOV-synthetization concept to design a silicon-based top-facing OPA for realizing a wide cone-shaped 360°FOV.By utilizing four OPA units sharing the 2D grating as a single emitter,four laser beams are simultaneously emitted upwards and manipulated to scan distinct regions,demonstrating seamless beam steering within the lateral 360°range.Furthermore,a frequency-modulated dissipative Kerr-soliton(DKS)microcomb is applied to the proposed multi-beam OPA,exhibiting its capability in large-scale parallel multi-target coherent detection.The comb lines are spatially dispersed with a 2D grating and separately measure distances and velocities in parallel,significantly enhancing the parallelism.The results showcase a ranging precision of 1 cm and velocimetry errors of less than 0.5 cm/s.This approach provides an alternative solution for LiDAR with an ultra-wide FOV and massively parallel multi-target detection capability.
