Non-spreading Bessel spatiotemporal optical vortices  

传播不变的贝塞尔时空涡旋光场

作　　者：Qian Cao Jian Chen Keyin Lu Chenhao Wan Andy Chong Qiwen Zhan 曹前;陈建;陆柯银;万辰皓;郑震洧;詹其文(School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;School of Optical and Electronic Information,Huazhong University of Science and Technology,Wuhan 430074,China;Department of Physics,University of Dayton,Dayton OH 45469,USA;Department of Electro-Optics and Photonics,University of Dayton,Dayton OH 45469,USA)

机构地区：[1]School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China [2]School of Optical and Electronic Information,Huazhong University of Science and Technology,Wuhan 430074,China [3]Department of Physics,University of Dayton,Dayton OH 45469,USA [4]Department of Electro-Optics and Photonics,University of Dayton,Dayton OH 45469,USA

出　　处：《Science Bulletin》2022年第2期133-140,M0003,共9页科学通报（英文版）

摘　　要：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.本文在理论和实验上研究了贝塞尔时空波包以及贝塞尔时空涡旋波包.贝塞尔时空光场可以通过对空间-频率域的光场实施相位调控而产生.进一步对贝塞尔时空光场加载时,空涡旋相位则可以生成一种新型的时空光场——携带光子横向轨道角动量的贝塞尔时空涡旋光场.数值模拟以及实验测量结果验证了贝塞尔时空涡旋光场具备在色散介质中传播不变的特性.具有这一特性的贝塞尔时空涡旋光场可实现光子横向轨道角动量的长距离有效传输.利用贝塞尔时空涡旋光场,高阶时空涡旋在时空域内受到更好的约束从而避免了其在传输过程中在时空域内发生分裂.这一研究结果解决了时空涡旋光场在实际应用中的一个关键难题,为进一步推进时空涡旋光场的研究提供了新的工具.

关 键 词：Optical vortices Bessel spatiotemporal wavepacket Orbital angular momentum Spatiotemporal vortex 

分 类 号：O43[机械工程—光学工程]