Recently,spatiotemporal optical vortices(STOVs)with transverse orbital angular momentum have emerged as a significant research topic.While various STOV fields have been explored,they often suffer from a critical limit...Recently,spatiotemporal optical vortices(STOVs)with transverse orbital angular momentum have emerged as a significant research topic.While various STOV fields have been explored,they often suffer from a critical limitation:the spatial and temporal dimensions of the STOV wavepacket are strongly correlated with the topological charge.展开更多
Spatiotemporal optical vortices(STOVs)exhibit characteristics of transverse orbital angular momentum(OAM)that is perpendicular to the direction of pulse propagation,indicating significant potential for diverse applica...Spatiotemporal optical vortices(STOVs)exhibit characteristics of transverse orbital angular momentum(OAM)that is perpendicular to the direction of pulse propagation,indicating significant potential for diverse applications.In this study,we employ vanadium dioxide and photonic crystal plates to design tunable transreflective dual-channel terahertz(THz)spatiotemporal vortex generation devices that possess multipolarization adaptability.In the reflection channel,we achieve active tunability of the topological dark lines by utilizing circularly polarized light,based on the topological dark phenomenon,and observe variations in the number of singularities across the parameter space from different observational perspectives.In the transmission channel,we generate independent vortex singularities using linearly polarized light.This multifunctional terahertz device offers a novel approach for the generation and active tuning of spatiotemporal vortices.展开更多
We report the experimental and theoretical investigation of tilted spatiotemporal optical vortices with partial temporal coherence.The theoretical study shows that the instantaneous spatiotemporal optical vortex is wi...We report the experimental and theoretical investigation of tilted spatiotemporal optical vortices with partial temporal coherence.The theoretical study shows that the instantaneous spatiotemporal optical vortex is widely variable with the statistical orbital angular momentum(OAM)direction.While decreasing temporal coherence results in a larger variability of OAM tilt,the average OAM direction is relatively unchanged.展开更多
基金National Natural Science Foundation of China(12434012,12474336)Shanghai Science and Technology Committee(24JD1402600,24QA2705800)+2 种基金National Research Foundation of Korea(2022R1A2C1091890)Global-Learning&Academic Research Institution for Master's/PhD students,and Postdocs(LAMP)Program of the National Research Foundation of Korea(NRF)funded by the Ministry of Education(RS-2023-00301938)Key Project ofWestlake Institute for Optoelectronics(2023GD007).
文摘Recently,spatiotemporal optical vortices(STOVs)with transverse orbital angular momentum have emerged as a significant research topic.While various STOV fields have been explored,they often suffer from a critical limitation:the spatial and temporal dimensions of the STOV wavepacket are strongly correlated with the topological charge.
基金National Natural Science Foundation of China(62375158,62105187)Natural Science Foundation of Shandong Province(ZR2021QF010,ZR2020MF107)Development Plan of Youth Innovation Team in Colleges and Universities of Shandong Province(2022KJ216)。
文摘Spatiotemporal optical vortices(STOVs)exhibit characteristics of transverse orbital angular momentum(OAM)that is perpendicular to the direction of pulse propagation,indicating significant potential for diverse applications.In this study,we employ vanadium dioxide and photonic crystal plates to design tunable transreflective dual-channel terahertz(THz)spatiotemporal vortex generation devices that possess multipolarization adaptability.In the reflection channel,we achieve active tunability of the topological dark lines by utilizing circularly polarized light,based on the topological dark phenomenon,and observe variations in the number of singularities across the parameter space from different observational perspectives.In the transmission channel,we generate independent vortex singularities using linearly polarized light.This multifunctional terahertz device offers a novel approach for the generation and active tuning of spatiotemporal vortices.
基金supported by the National Research Foundation of Korea(NRF)funded by the Korea government(MSIT)(No.2022R1A2C1091890).
文摘We report the experimental and theoretical investigation of tilted spatiotemporal optical vortices with partial temporal coherence.The theoretical study shows that the instantaneous spatiotemporal optical vortex is widely variable with the statistical orbital angular momentum(OAM)direction.While decreasing temporal coherence results in a larger variability of OAM tilt,the average OAM direction is relatively unchanged.
