Charge-Selective Displacement of Spatiotemporal Optical Vortices at a Spatially Uniform Time Boundary
Abstract
At a spatially uniform, in-plane-isotropic time boundary, the transverse displacement of a spatiotemporal optical vortex changes sign with its topological charge, despite a charge-independent conversion weight. Radial spectral filtering couples to the vortex phase while preserving identical converted spectral intensities for opposite charges. For a narrow scalar Gaussian spectrum, the displacement follows the logarithmic slope of the spectral weight and occurs with zero mean transverse momentum. In a finite pumped GaAs waveguide, unequal attenuation during extraction adds angular deflection. Independent Maxwell--Drude simulations test this extraction-induced response and give ±42~mrad before detector filtering. Calculated centroid traces at multiple planes separate propagation-induced drift from position offsets.
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BibTeX
@misc{mei2026chargeselective,
title = {{Charge-Selective Displacement of Spatiotemporal Optical Vortices at a Spatially Uniform Time Boundary}},
author = {Chao Mei and Peilong Yang},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.24713},
eprint = {2610.24713},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.24713},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Charge-Selective Displacement of Spatiotemporal Optical Vortices at a Spatially Uniform Time Boundary
AU - Chao Mei
AU - Peilong Yang
PY - 2026
DA - 2026/10/17
PB - arXiv
DO - 10.48550/arxiv.2610.24713
UR - https://arxiv.org/abs/2610.24713
AB - At a spatially uniform, in-plane-isotropic time boundary, the transverse displacement of a spatiotemporal optical vortex changes sign with its topological charge, despite a charge-independent conversion weight. Radial spectral filtering couples to the vortex phase while preserving identical converted spectral intensities for opposite charges. For a narrow scalar Gaussian spectrum, the displacement follows the logarithmic slope of the spectral weight and occurs with zero mean transverse momentum. In a finite pumped GaAs waveguide, unequal attenuation during extraction adds angular deflection. Independent Maxwell--Drude simulations test this extraction-induced response and give ±42~mrad before detector filtering. Calculated centroid traces at multiple planes separate propagation-induced drift from position offsets.
ER -