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arXiv · 2507.03654

Bulk-to-surface coupling of spatiotemporal vortices

Francisco J. Rodríguez-Fortuño·Michela F. Picardi·Konstantin Y. Bliokh
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Abstract

We consider the coupling of bulk space-time-structured waves, such as spatiotemporal vortex pulses (STVPs), to surface waves, such as surface plasmon-polaritons (SPPs). For resonant coupling that preserves the frequency and tangent wavevector components, it is challenging to transfer the space-time wave structure because of the difference between the bulk and surface wave dispersions. We describe three mechanisms allowing for the bulk-to-surface conversion of STVPs: (i) a suitable tilt of the pulse spectrum in the $(\omega,{\bf k})$ space; (ii) confinement of the incident pulse in the direction orthogonal to the vortex; and (iii) losses in the surface waves. We supply general considerations with numerical simulations of the STVP-to-SPP coupling at a dielectric-prism/metal-film interface.

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Francisco J. Rodríguez-Fortuño, Michela F. Picardi, Konstantin Y. Bliokh. 2025-07-04. Bulk-to-surface coupling of spatiotemporal vortices. https://doi.org/10.1364/ol.572778

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