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Exciting space-time surface plasmon polaritons by irradiating a nanoslit structure

Guardado en:
Publicado en:arXiv.org (Dec 16, 2022), p. n/a
Autor principal: Ichiji, Naoki
Otros Autores: Yessenov, Murat, Schepler, Kenneth L, Abouraddy, Ayman F, Kubo, Atsushi
Publicado:
Cornell University Library, arXiv.org
Materias:
Group velocity
Polaritons
Excitation
Spacetime
Wave propagation
Wave diffraction
Metal surfaces
Dielectrics
Wave packets
Projectiles
Wave dispersion
Acceso en línea:Citation/Abstract
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Resumen:Space-time (ST) wave packets are propagation-invariant pulsed optical beams that travel freely in dielectrics at a tunable group velocity without diffraction or dispersion. Because ST wave packets maintain these characteristics even when only one transverse dimension is considered, they can realize surface-bound waves (e.g., surface plasmon polaritons at a metal-dielectric interface, which we call ST-SPPs) that have the same unique characteristics of their freely propagating counterparts. However, because the spatio-temporal spectral structure of ST-SPPs is key to their propagation invariance on the metal surface, their excitation methodology must be considered carefully. We show here using finite-difference time-domain (FDTD) simulations that an appropriately synthesized ST wave packet in free space can be couples to a ST-SPP via a single nano-scale slit inscribed in the metal surface. Our calculations confirm that this excitation methodology yields surface-bound ST-SPPs that are locarized in all dimensions (and can thus be considered as plasmonic 'bullets'), which travel rigidly at the metal-dielectric interface without diffraction or dispersion at a tunable group velocity.
ISSN:2331-8422
Fuente:Engineering Database