Orbit-Orbit Interaction in Spatiotemporal Optical Vortex  

作　　者：Jian Chen Jie Zhao Xi Shen Dewei Mo Cheng-Wei Qiu Qiwen Zhan 

机构地区：[1]School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China [2]Shanghai Key Laboratory of Modern Optical System,University of Shanghai for Science and Technology,Shanghai 200093,China [3]Department of Electrical and Computer Engineering,National University of Singapore,Singapore 117583,Singapore

出　　处：《Engineering》2025年第2期44-51,共8页工程(英文)

基　　金：supported by the National Natural Science Foun-dation of China(12274299 and 92050202);the Shanghai Science and Technology Committee(22QA1406600).

摘　　要：While spin-orbit interaction has been extensively studied,few investigations have reported on the interaction between orbital angular momenta(OAMs).In this work,we study a new type of orbit-orbit coupling between the longitudinal OAM and the transverse OAM carried by a three-dimensional(3D)spatiotemporal optical vortex(STOV)in the process of tight focusing.The 3D STOV possesses orthogonal OAMs in the x-y,t-x,and y-t planes,and is preconditioned to overcome the spatiotemporal astigmatism effect.x,y,and t are the axes in the spatiotemporal domain.The corresponding focused wavepacket is calculated by employing the Debye diffraction theory,showing that a phase singularity ring is generated by the interactions among the transverse and longitudinal vortices in the highly confined STOV.The Fourier-transform decomposition of the Debye integral is employed to analyze the mechanism of the orbit-orbit interaction.This is the first revelation of coupling between the longitudinal OAM and the transverse OAM,paving the way for potential applications in optical trapping,laser machining,nonlinear light-matter interactions,and more.

关 键 词：Spatiotemporal optical vortex Orbital angular momentum Momentum interaction Highly confined wavepacket DIFFRACTION 

分 类 号：O43[机械工程—光学工程] O436[理学—光学]