Frontiers in Optics + Laser Science 2022 (FIO, LS), Год журнала: 2023, Номер unknown, С. JTu4A.6 - JTu4A.6
Опубликована: Янв. 1, 2023
We present a theory to describe Space-Time Supermodes in waveguide that is 100 µ m thick and 10 mm long compare their propagation characteristics conventional waveguiding.
Язык: Английский
Advances in Optics and Photonics, Год журнала: 2022, Номер 14(3), С. 455 - 455
Опубликована: Апрель 29, 2022
Space-time wave packets (STWPs) constitute a broad class of pulsed optical fields that are rigidly transported in linear media without diffraction or dispersion, and therefore propagation-invariant the absence nonlinearities waveguiding structures. Such exhibit unique characteristics, such as controllable group velocities free space exotic refractive phenomena. At root these behaviors is fundamental feature underpinning STWPs: their spectra not separable with respect to spatial temporal degrees freedom. Indeed, spatiotemporal structure endowed non-differentiable angular which each frequency associated single prescribed wavelength. Furthermore, controlled deviation from this particular yields novel depart propagation-invariance precise manner, acceleration an arbitrary axial distribution velocity, tunable dispersion profiles, Talbot effects space–time. Although basic concept STWPs has been known since 1980s, only very recently rapid experimental development emerged. These advances made possible by innovations Fourier synthesis, thereby opening new frontier for structured light at intersection beam optics ultrafast optics. plethora spatiotemporally (such flying-focus packets, toroidal pulses, vortices) now providing swath surprising ranging transverse orbital momentum. We review historical STWPs, describe approaches efficient enumerate various results potential applications other fields, before casting eye on future roadmap field.
Язык: Английский
Процитировано
100
Nature Communications, Год журнала: 2025, Номер 16(1)
Опубликована: Фев. 27, 2025
Space-time wave packets (STWPs) with correlated spatial and frequency degrees of freedom exhibit time-dependent interference, thereby giving rise to interesting dynamic evolution behaviors. While versatile spatiotemporal phenomena have been demonstrated in freely propagating fields, coupling light into multimode fibers remains a fundamental experimental challenge. Whereas synthesizing STWPs typically relies on continuum plane-wave modes, their multimode-fiber counterparts must be constructed from the discrete set fiber modes whose propagation constants depend structures. Here, we demonstrate axially controllable motion transverse profile reconfigurable group velocity graded-index fibers. This is accomplished by introducing linear association between comb lines corresponding modes. The synthesized present rotation translation 4.8-ps period. Simultaneously, can tuned positive subluminal superluminal negative values (e.g., 0.870, 1.35, 10, –3.3 × 108 m/s, respectively). Su et al. ultra-fast pulses dynamically evolving profiles tunable velocities ranging values, achieved through space-time packets.
Язык: Английский
Процитировано
1
Nanophotonics, Год журнала: 2025, Номер unknown
Опубликована: Март 20, 2025
Abstract Shaping transverse degrees of freedom across different temporal frequency spectra has unlocked new possibilities for realizing a wide variety novel spatiotemporal phenomena. In particular, using the discrete frequencies optical combs synthesis enables precise spatial separation and control individual spectral lines, thereby facilitating experimental generation space-time wave packets (STWPs). This review explores theoretical investigation demonstration versatile STWPs synthesized correlated comb lines fields, including following: (a) exhibiting dynamic evolution properties; (b) with customized group velocities; (c) longitudinal over STWPs.
Язык: Английский
Процитировано
1
ACS Photonics, Год журнала: 2023, Номер 10(2), С. 374 - 382
Опубликована: Янв. 11, 2023
Because surface plasmon polaritons (SPPs) are waves characterized by one free transverse dimension, the only monochromatic diffraction-free spatial profiles for SPPs cosine and Airy waves. Pulsed SPP wave packets have been recently formulated that propagation-invariant localized in in-plane dimensions virtue of a tight spectral association between their temporal frequencies, which thus dubbed "space-time" (ST) SPPs. spatiotemporal structure unique to ST-SPPs, optimal launching strategy such novel plasmonic field configurations remains an open question. We present here critical step toward realizing ST-SPPs reporting observations ultrabroadband striped ST-SPPs. These each wavelength travels at prescribed angle with respect propagation axis produce periodic (striped) profile is diffraction-free. start free-space ST packet coupled ST-SPP gold-dielectric interface, unambiguously identify via axial beating detected two-photon fluorescence produced superposition incident excited surface-bound ST-SPP. results highlight viable approach efficient reliable coupling and, thus, represent first crucial realization full potential sensing imaging.
Язык: Английский
Процитировано
12
APL Photonics, Год журнала: 2025, Номер 10(1)
Опубликована: Янв. 1, 2025
In this article, we experimentally generate a vortex space-time (ST) wave packet carrying orbital angular momentum (OAM) and confirm that the OAM of beam survives after propagating either in presence line obstruction or across thin scattering medium. A comparison our findings with both Bessel standard Gaussian beams reveals ST-OAM packets exhibit significantly higher mean Pearson’s correlation coefficient compared to these other beams. addition, employ 3-mm thick glass microscope slide as waveguide find belonging ST remains protected propagation. Our have potential utility communication applications, sensing, imaging, optical trapping.
Язык: Английский
Процитировано
0
Journal of the Optical Society of America A, Год журнала: 2023, Номер 40(6), С. 1142 - 1142
Опубликована: Март 6, 2023
When an optical pulse is focused into a multimode waveguide or fiber, the energy divided among available guided modes. Consequently, initially localized intensity spreads transversely, spatial profile undergoes rapid variations with axial propagation, and disperses temporally. Space-time (ST) supermodes are pulsed field configurations that propagate invariantly in waveguides by assigning each mode to prescribed wavelength. ST can be thus viewed as spectrally discrete, guided-wave counterparts of recently demonstrated propagation-invariant wave packets free space. The group velocity supermode tunable independently-in principle-of structure, group-velocity dispersion eliminated dramatically curtailed, time-averaged axially invariant along absence mode-coupling. We establish here theoretical framework for studying planar waveguides. Modal engineering allows sculpting this transverse from on-axis peak dip (dark beam) multi-peak flat distribution. Moreover, synthesized using incoherent light, paving way potential applications beam delivery lighting applications.
Язык: Английский
Процитировано
4
Physical review. A/Physical review, A, Год журнала: 2024, Номер 109(1)
Опубликована: Янв. 19, 2024
The authors present an experimental procedure that is analogous to Lorentz boosts of space-time wave packets (STWPs), in the physical transformation identical mathematical impact a except for overall Doppler shift carrier. Their work indicates boost STWP results another STWP.
Язык: Английский
Процитировано
1
Frontiers in Optics + Laser Science 2022 (FIO, LS), Год журнала: 2023, Номер unknown, С. JTu4A.6 - JTu4A.6
Опубликована: Янв. 1, 2023
We present a theory to describe Space-Time Supermodes in waveguide that is 100 µ m thick and 10 mm long compare their propagation characteristics conventional waveguiding.
Язык: Английский
Процитировано
0