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 ...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.展开更多
Airy wavepackets,distinguished by their unique self-accelerating,self-healing,and nondiffracting properties,have found extensive applications in particle manipulation,biomedical imaging,and material processing.Investi...Airy wavepackets,distinguished by their unique self-accelerating,self-healing,and nondiffracting properties,have found extensive applications in particle manipulation,biomedical imaging,and material processing.Investigations into Airy waves have predominantly concentrated on either spatial or temporal dimensions,whereas studies on spatiotemporal Airy wavepackets have garnered less attention owing to the intricate nature of their generation systems.In this study,we present the generation of spatiotemporal Airy wavepackets by employing discrete frequency modulation and geometric phase modulation of pulses from a mode-locked fiber laser.The properties of Airy wavepackets are dictated by the imparted cubic frequency phase,geometric phase,and polarization state,resulting in controllable spatiotemporal profiles.The self-healing properties of spatiotemporal Airy wavepackets have been confirmed in both temporal and spatial dimensions,demonstrating substantial potential for applications in dynamic microscopy imaging and high-speed optical data transmission.展开更多
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 c...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.展开更多
We are at an inflection point in our control of light,beyond 2D transverse intensity patterns and towards tailored light in space and time,for complete 4D control.When new degrees of freedom are added to the mix,the p...We are at an inflection point in our control of light,beyond 2D transverse intensity patterns and towards tailored light in space and time,for complete 4D control.When new degrees of freedom are added to the mix,the potential is enormous.It is novel spatiotemporal optical wavepackets that are lighting the way to this exciting future.Controlling light can be traced back thousands of years,with stories of directing sunlight from mirrors to burn attacking ships,an early form of incoherent light shaping[1].In this example,when light is added to light,the outcome is proportionally more light.This paradigm is broken when the light can be treated as coherent waves:light added to light can result in darkness.Thomas Young did exactly this to create spatial intensity structure in the form of“fringes”.Moving beyond just two displaced splits,his notion of fringes can be generalized to any geometry and any degree of freedom[2].His experiment revealed just how easy it is to control the spatial structure of light by simply adding plane waves,initially in the transverse plane for 2D structured light in intensity,but now in more abstract degrees of freedom of light[3].展开更多
基金supported by the National Natural Science Foun-dation of China(12274299 and 92050202)the Shanghai Science and Technology Committee(22QA1406600).
文摘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.
基金supported by the National Natural Science Foundation of China(Nos.12274344 and 12374279)the Shaanxi Province Technological Innovation Guidance Special Project(No.2024ZC-YYDP-10)the Shaanxi Fundamental Research Project in Mathematical and Physical Sciences(No.23JSZ004)。
文摘Airy wavepackets,distinguished by their unique self-accelerating,self-healing,and nondiffracting properties,have found extensive applications in particle manipulation,biomedical imaging,and material processing.Investigations into Airy waves have predominantly concentrated on either spatial or temporal dimensions,whereas studies on spatiotemporal Airy wavepackets have garnered less attention owing to the intricate nature of their generation systems.In this study,we present the generation of spatiotemporal Airy wavepackets by employing discrete frequency modulation and geometric phase modulation of pulses from a mode-locked fiber laser.The properties of Airy wavepackets are dictated by the imparted cubic frequency phase,geometric phase,and polarization state,resulting in controllable spatiotemporal profiles.The self-healing properties of spatiotemporal Airy wavepackets have been confirmed in both temporal and spatial dimensions,demonstrating substantial potential for applications in dynamic microscopy imaging and high-speed optical data transmission.
文摘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.
文摘We are at an inflection point in our control of light,beyond 2D transverse intensity patterns and towards tailored light in space and time,for complete 4D control.When new degrees of freedom are added to the mix,the potential is enormous.It is novel spatiotemporal optical wavepackets that are lighting the way to this exciting future.Controlling light can be traced back thousands of years,with stories of directing sunlight from mirrors to burn attacking ships,an early form of incoherent light shaping[1].In this example,when light is added to light,the outcome is proportionally more light.This paradigm is broken when the light can be treated as coherent waves:light added to light can result in darkness.Thomas Young did exactly this to create spatial intensity structure in the form of“fringes”.Moving beyond just two displaced splits,his notion of fringes can be generalized to any geometry and any degree of freedom[2].His experiment revealed just how easy it is to control the spatial structure of light by simply adding plane waves,initially in the transverse plane for 2D structured light in intensity,but now in more abstract degrees of freedom of light[3].
