Isochronous space-time wave packets

Isochronous space-time wave packets

The group delay incurred by an optical wave packet depends on its path length. Therefore, when a wave packet is obliquely incident on a planar homogeneous slab, the group delay upon traversing it inevitably increases with the angle of incidence. Here, we confirm the existence of isochronous "sp...

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Veröffentlicht in:Optics letters 2021-05, Vol.46 (10), p.2260-2263
Hauptverfasser: Allende Motz, Alyssa M, Yessenov, Murat, Abouraddy, Ayman F
Format: Artikel
Sprache:eng
Schlagworte:
Group delay
Group velocity
Incidence angle
Inertia
Optical materials
Optics
Wave packets
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Yessenov, Murat
Abouraddy, Ayman F
description The group delay incurred by an optical wave packet depends on its path length. Therefore, when a wave packet is obliquely incident on a planar homogeneous slab, the group delay upon traversing it inevitably increases with the angle of incidence. Here, we confirm the existence of isochronous "space-time" (ST) wave packets: pulsed beams whose spatiotemporal structure enables them to traverse the layer with a fixed group delay over a wide span of incident angles. This unique behavior stems from the dependence of the group velocity of a refracted ST wave packet on its angle of incidence. Isochronous ST wave packets are observed in slabs of optical materials with indices ranging from 1.38 to 2.5 for angles up to 50° away from normal incidence.
doi_str_mv 10.1364/ol.423227
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subjects Group delay
Group velocity
Incidence angle
Inertia
Optical materials
Optics
Wave packets
title Isochronous space-time wave packets
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