Propagation dynamics of a spatiotemporal vortex pulse in the spatial fractional system  

作　　者：JINQI SONG FENGQI LIU MINGLI SUN XIANGYU TONG NAICHEN ZHANG BINGSONG CAO WENZHE WANG KAIKAI HUANG XIAN ZHANG XUANHUI LU 

机构地区：[1]Physics Department,Zhejiang University,Hangzhou 310027,China [2]Zhejiang University of Science and Technology,Hangzhou 310023,China [3]School of Science,Huzhou University,Huzhou 313000,China [4]Computer Science Department,Zhejiang University,Hangzhou 310027,China [5]Department of Physics,Zhejiang Sci-Tech University,Hangzhou 310018,China

出　　处：《Photonics Research》2024年第9期2027-2032,共6页光子学研究（英文版）

基　　金：National Key Research and Development Program of China(2022YFC2808203);National Natural Science Foundation of China(11474254,11804298).

摘　　要：The dynamics of wave packets carrying a spatiotemporal vortex in the spatial fractional system is still an open problem.The difficulty stems from the fact that the fractional Laplacian derivative is essentially a nonlocal operator,and the vortex is space-time coupled.Here,we investigate the transmission of spatiotemporal vortices in the spatial fractional wave equation(FWE)and demonstrate the effects of linewidth,vortex topological charge,and linear chirp modulation on the transmission of Bessel-type spatiotemporal vortex pulses(BSTVPs).Under narrowband conditions,we find that the propagation of BSTVP in the FWE can be seen as the coherent superposition of two linearly shifted half-BSTVPs and can reveal orbital angular momentum backflow for the half-BSTVP.Our analysis can be extended to other spatiotemporal vortex pulses.

关 键 词：VORTEX FRACTIONAL SYSTEM 

分 类 号：O43[机械工程—光学工程]