Refraction of space–time wave packets in a dispersive medium

Yessenov, Murat; Faryadras, Sanaz; Benis, Sepehr; Hagan, David J.; Stryland, Eric W. Van; Abouraddy, Ayman F.

doi:10.1364/ol.450828

Cited by 9 publications

(6 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…After the submission of this paper, we were aware of an experimental demonstration of the derived law. [42] These findings further support the idea of imposing spatio-temporal correlation to shape the propagation of wave, and pave the way for dispersion compensation in dispersive media. Our work also points to the significant opportunities for creating space-time wavepackets in dispersive photonic structures or complex media.…”

Section: Discussionsupporting

confidence: 58%

Nondispersive Space–Time Wave Packets Propagating in Dispersive Media

Guo

Xiao

2022

Laser & Photonics Reviews

View full text Add to dashboard Cite

Space-time wave packets can propagate invariantly in free space with arbitrary group velocity thanks to the spatio-temporal correlation. Here it is proved that the space-time wave packets are stable in dispersive media as well and free from the spread in time caused by material dispersion. Furthermore, the law of anomalous refraction for space-time wave packets is generalized to the weakly dispersive situation. These results reveal new potential of space-time wave packets for the applications in real dispersive media.

show abstract

Section: Discussionsupporting

confidence: 58%

Nondispersive Space–Time Wave Packets Propagating in Dispersive Media

Guo

Xiao

2022

Laser & Photonics Reviews

View full text Add to dashboard Cite

show abstract

“…Refraction of baseband ST wave packets in dispersive media is now being studied theoretically [332] and experimentally [333]. Accounting for the unique aspects of the refraction of ST wave packets will be essential for all applications where ST wave packets are synthesized in free space and then coupled into a particular medium.…”

Section: Group-velocity Inversionmentioning

confidence: 99%

Space-time wave packets

Yessenov¹,

Hall²,

Schepler³

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

Space-time' (ST) wave packets constitute a broad class of pulsed optical fields that are rigidly transported in linear media without diffraction or dispersion, and are therefore propagation-invariant in absence of optical nonlinearities or waveguiding structures. Such wave packets exhibit unique characteristics, such as controllable group velocities in free space and exotic refractive phenomena. At the root of of these behaviors is a fundamental feature underpinning ST wave packets: their spectra are not separable with respect to the spatial and temporal degrees of freedom. Indeed, the spatio-temporal structure is endowed with non-differentiable angular dispersion, in which each spatial frequency is associated with a single prescribed wavelength. Furthermore, deviation from this particular spatio-temporal structure yields novel behaviors that depart from propagation invariance in a precise manner, such as acceleration with an arbitrary axial distribution of the group velocity, tunable dispersion profiles, and Talbot effects in space-time. Although the basic concept of ST wave packets has been known since the 1980's, only very recently has rapid experimental development emerged. These advances are made possible by innovations in spatio-temporal Fourier synthesis, thereby opening a new frontier for structured light at the intersection of beam optics and ultrafast optics. Furthermore, a plethora of novel spatio-temporally structured optical fields (such as flying-focus wave packets, toroidal pulses, and ST optical vortices) are now providing a swathe of surprising characteristics, ranging from tunable group velocities to transverse orbital angular momentum. We review the historical development of ST wave packets, describe the new experimental approach for their efficient synthesis, and enumerate the various new results and potential applications for ST wave packets and other spatio-temporally structured fields that are rapidly accumulating, before casting an eye on a future roadmap for this field.

show abstract

“…We have ignored here chromatic dispersion in the waveguide material, which can be easily accounted by by a modification of Eq. 9; see [58,59].…”

Section: B St Wave-packet Synthesis In Free Spacementioning

confidence: 99%

Propagation-invariant space-time supermodes in a multimode waveguide

Shiri¹,

Webster²,

Schepler³

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

When an optical pulse is spatially localized in a highly multimoded waveguide, its energy is typically distributed among a multiplicity of modes, thus giving rise to a speckled transverse spatial profile that undergoes erratic changes with propagation. It has been suggested theoretically that pulsed multimode fields in which each wavelength is locked to an individual mode at a prescribed axial wave number will propagate invariantly along the waveguide at a tunable group velocity. In this conception, an initially localized field remains localized along the waveguide. Here, we provide proof-of-principle experimental confirmation for the existence of this new class of pulsed guided fields, which we denote 'space-time supermodes', and verify their propagation invariance in a planar waveguide. By superposing up to 21 modes, each assigned to a prescribed wavelength, we construct space-time supermodes in a 170-micron-thick planar glass waveguide with group indices extending from ≈ 1 to ≈ 2. The initial transverse width of the field is 6 microns, and the waveguide length is 9.1 mm, which is ≈ 257× the associated Rayleigh range. A variety of axially invariant transverse spatial profiles are produced by judicious selection of the modes contributing to the ST supermode, including single-peak and multi-peak fields, dark fields (containing a spatial dip), and even flat uniform intensity profiles.

show abstract

Refraction of space–time wave packets in a dispersive medium

Cited by 9 publications

References 44 publications

Nondispersive Space–Time Wave Packets Propagating in Dispersive Media

Nondispersive Space–Time Wave Packets Propagating in Dispersive Media

Space-time wave packets

Propagation-invariant space-time supermodes in a multimode waveguide

Contact Info

Product

Resources

About