Achieving spatiotemporal control of light at high speeds presents immense possibilities for various applications in communication, computation, metrology, and sensing. The integration of subwavelength metasurfaces and optical waveguides offers a promising approach to manipulate light across multiple degrees of freedom at high speed in compact photonic integrated circuit (PIC) devices. Here, we demonstrate a gigahertz-rate-switchable wavefront shaping by integrating metasurface, lithium niobate on insulator photonic waveguides, and electrodes within a PIC device. As proofs of concept, we showcase the generation of a focus beam with reconfigurable arbitrary polarizations, switchable focusing with lateral focal positions and focal length, orbital angular momentum light beams as well as Bessel beams. Our measurements indicate modulation speeds of up to the gigahertz rate. This integrated platform offers a versatile and efficient means of controlling the light field at high speed within a compact system, paving the way for potential applications in optical communication, computation, sensing, and imaging.

高速垂直腔面发射激光器（VCSEL）是高速光通信的主要光源之一，受数据流量的迅速增长牵引，高速VCSEL正向更大带宽、更高速率方向发展。长春光机所团队通过优化VCSEL外延设计和生长、器件设计和制备、以及性能表征技术，在多个波长的高速VCSEL的调制带宽、传输速率、模式、功耗等性能方面取得了显著进展。实现高速单模940 nm VCSEL 27.65 GHz调制带宽和53 Gbit/s传输速率；通过波分复用基于850 nm、880 nm、910 nm和940 nm高速VCSEL实现200 Gbit/s链路方案；通过光子寿命优化，实现高速VCSEL低至100 fJ/bit的超低能耗；实现1030 nm高速VCSEL 25 GHz调制带宽；实现1550 nm 高速VCSEL 37 Gbit/s传输速率。研制的高速VCSEL在光通信等领域有重要应用前景。