摘要
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
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)。
