Bulk-to-surface coupling of spatiotemporal vortices

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 $(\omega ,\mathbf{k})$ 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.

5 pages, 3 figures

References in corpus (18)

• Electromagnetic Angular Momentum
• Electromagnetic Force and Momentum
• Ultrafast active plasmonics: transmission and control of femtosecond plasmon signals
• Photonic Cyclone: spatiotemporal optical vortex with controllable transverse orbital angular momentum
• Free-space propagation of spatio-temporal optical vortices (STOVs)
• Spatio-temporal vortex beams and angular momentum
• Spatio-temporal optical vortices
• Weak Measurements of Light Chirality with a Plasmonic Slit
• Roadmap on spatiotemporal light fields
• Spatiotemporal Vortex Pulses: Angular Momenta and Spin-Orbit Interaction
• Roadmap on structured waves
• Mode structure and orbital angular momentum of spatiotemporal optical vortex (STOV) pulses
• Symmetric and asymmetric solitons and vortices in linearly coupled two-dimensional waveguides with the cubic-quintic nonlinearity
• Orbital angular momentum of optical, acoustic, and quantum-mechanical spatiotemporal vortex pulses
• Observation of acoustic spatiotemporal vortices
• Resonant Plasmon-Soliton Interaction
• Generation of Spatiotemporal Vortex Pulses by Simple Diffractive Grating
• Spatio-temporal optical vortices: principles of description and basic properties