Bulk-to-surface coupling of spatiotemporal vortices
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866915474084724736 |
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| author | Rodríguez-Fortuño, Francisco J. Picardi, Michela F. Bliokh, Konstantin Y. |
| author_facet | Rodríguez-Fortuño, Francisco J. Picardi, Michela F. Bliokh, Konstantin Y. |
| contents | 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2507_03654 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Bulk-to-surface coupling of spatiotemporal vortices Rodríguez-Fortuño, Francisco J. Picardi, Michela F. Bliokh, Konstantin Y. Optics 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. |
| title | Bulk-to-surface coupling of spatiotemporal vortices |
| topic | Optics |
| url | https://arxiv.org/abs/2507.03654 |