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• W3185161624 startingPage "2345" @default.
• W3185161624 abstract "Propagation-invariant or nondiffracting optical beams have received considerable attention during the last two decades. However, the pulsed nature of light waves and the structured property of optical media like waveguides are often overlooked. We here present a four-dimensional spatiotemporal approach that extends and unifies both concepts of conical waves and helicon beams, mainly studied in bulk media. By taking advantage of tight correlations between the spatial modes, the topological charges, and the frequencies embedded in an optical field, we reveal propagation-invariant (dispersion- and diffraction-free) space-time wavepackets carrying orbital angular momentum (OAM) that evolve on spiraling trajectories in both time and space in bulk media or multimode fibers. Besides their intrinsic linear nature, we show that such wave structures can spontaneously emerge when a rather intense ultrashort pulse propagates nonlinearly in OAM modes. With emerging technologies of pulse/beam shaping, multimode fibers, and modal multiplexing, our proposed scheme to create OAM-carrying helicon wavepackets could find a plethora of applications. Finally, our work provides a general approach to explore the dynamics of three-dimensional spiraling wavepackets with topological properties, and the outlook of this topic goes well beyond optics, since such wavepackets are being studied nowadays in various branches of physics such as acoustic spanners, polaritonics, plasma waves, and particle beams." @default.
• W3185161624 created "2021-08-02" @default.
• W3185161624 creator A5013762019 @default.
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• W3185161624 date "2021-07-16" @default.
• W3185161624 modified "2023-10-16" @default.
• W3185161624 title "Spatiotemporal Helicon Wavepackets" @default.
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• W3185161624 doi "https://doi.org/10.1021/acsphotonics.1c00522" @default.
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