Qian Cao ¹, Jian Chen 陈建 ¹, Keyin Lu ¹, Chenhao Wan 万辰皓 ¹ ², Andy Chong ³ ⁴, Qiwen Zhan 詹其文 ¹
¹ School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China 上海科技大学 光电信息与计算机工程学院
² School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China 华中科技大学 光学与电子信息学院
³ Department of Physics, University of Dayton, Dayton, OH, 45469, United States
⁴ Department of Electro-Optics and Photonics, University of Dayton, Dayton, OH, 45469, United States
Non-spreading nature of Bessel spatiotemporal wavepackets is theoretically and experimentally investigated and orders of magnitude improvement in the spatiotemporal spreading has been demonstrated. The spatiotemporal confinement provided by the Bessel spatiotemporal wavepacket is further exploited to transport transverse orbital angular momentum through embedding spatiotemporal optical vortex into the Bessel spatiotemporal wavepacket, constructing a new type of wavepacket: Bessel spatiotemporal optical vortex.
Both numerical and experimental results demonstrate that spatiotemporal vortex structure can be well maintained and confined through much longer propagation. High order spatiotemporal optical vortices can also be better confined in the spatiotemporal domain and prevented from further breaking up, overcoming a potential major obstacle for future applications of spatiotemporal vortex.