2025/07/04 by Rodríguez-Fortuño, Francisco J., Picardi, Michela F., Bliokh, Konstantin Y.
#FOS: Physical sciences #Optics (physics.optics)
paper · doi:10.48550/arxiv.2507.03654
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 (ω,\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.