Huo Pengcheng, Chen Wei, Zhang Zixuan, Zhang Yanzeng, Liu Mingze, Lin Peicheng, Zhang Hui, Chen Zhaoxian, Lezec Henri, Zhu Wenqi, Agrawal Amit, Peng Chao, Lu Yanqing, Xu Ting
National Laboratory of Solid-State Microstructures, College of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China.
Key Laboratory of Intelligent Optical Sensing and Manipulation, Ministry of Education, Nanjing University, Nanjing, 210093, China.
Nat Commun. 2024 Apr 9;15(1):3055. doi: 10.1038/s41467-024-47475-2.
Providing additional degrees of freedom to manipulate light, spatiotemporal optical vortex (STOV) beams carrying transverse orbital angular momentum are of fundamental importance for spatiotemporal control of light-matter interactions. Unfortunately, existing methods to generate STOV are plagued by various limitations such as inefficiency, bulkiness, and complexity. Here, we theoretically propose and experimentally demonstrate a microscale singlet platform composed of a slanted nanograting to generate STOV. Leveraging the intrinsic topological singularity induced by C symmetry and z-mirror symmetry breaking of the slanted nanograting, STOV is generated through the Fourier transform of the spiral phase in the momentum-frequency space to the spatiotemporal domain. In experiments, we observe the space-time evolution of STOV carried by femtosecond pulses using a time-resolved interferometry technique and achieve a generation efficiency exceeding 40%. Our work sheds light on a compact and versatile platform for light pulse shaping, and paves the way towards a fully integrated system for spatiotemporal light manipulation.
携带横向轨道角动量的时空光学涡旋（STOV）光束为光的操控提供了额外的自由度，对于光与物质相互作用的时空控制具有至关重要的意义。不幸的是，现有的产生STOV的方法受到各种限制，如效率低、体积大以及复杂性高。在此，我们从理论上提出并通过实验证明了一种由倾斜纳米光栅组成的微尺度单重态平台来产生STOV。利用倾斜纳米光栅的C对称性和z镜面对称性破缺所诱导的固有拓扑奇点，通过动量-频率空间中螺旋相位到时空域的傅里叶变换来产生STOV。在实验中，我们使用时间分辨干涉测量技术观察了飞秒脉冲携带的STOV的时空演化，并实现了超过40%的产生效率。我们的工作为光脉冲整形提供了一个紧凑且通用的平台，并为实现时空光操控的全集成系统铺平了道路。
Zotero 插件
