A particle-loop model with a semiclassical quantization rule reproduces every previously reported transverse OAM expression for spatiotemporal vortex pulses, tracing the discrepancies to the choice of centroid.
Fractional spatiotemporal optical vortices
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abstract
Spatiotemporal optical vortices (STOVs) with spiral phase in the space-time domain, which carry intrinsic transverse orbital angular momentum (OAM), introduce a new degree of freedom to light beams and exhibit unique properties. While integer and fractional spatial vortices have been extensively studied and widely applied, and research on integer STOVs have grown prosperously, fractional STOVs (FSTOVs), classified as STOVs with fractional spiral phases are rarely explored due to the challenges in characterizing rapidly varying spatiotemporal phases. Furthermore, approaches for the rapid recognition of FSTOVs are lacking. Herein, we experimentally and theoretically demonstrate the generation of FSTOVs in the far field. The generation, evolution, and diffraction rules of FSTOVs are revealed. Furthermore, a self-referential method for the rapid recognition of FSTOVs based on the energy ratio between the two end lobes of their diffraction patterns is proposed. This work will promote the development of the theory of light with transverse OAM, and open new opportunities for the applications of STOV, such as STOV-based optical communication and quantum information.
fields
physics.optics 1years
2026 1verdicts
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Orbital angular momentum of spatiotemporal vortices: a ray-mechanical analogy
A particle-loop model with a semiclassical quantization rule reproduces every previously reported transverse OAM expression for spatiotemporal vortex pulses, tracing the discrepancies to the choice of centroid.