Quasi-Bound States in the Continuum on Dislocated Bilayer Metal Gratings for Spatiotemporal Vortex Pulse Generation (Laser Photonics Rev. 19(9)/2025)

Abstract

Spatiotemporal Vortex Pulses

The cover image illustrates the research findings of Yungui Ma and co-workers. In article 2401391, they present an ultra-compact metasurface approach for the efficient generation of spatiotemporal vortex pulses (STVPs) by using quasi-bound states in the continuum. By slightly dislocating two sublayer gratings, incoming waves are converted into unidirectional surface modes, yielding high-fidelity STVPs, thus paving the way for future ultra-compact STVP multiplexing devices.