Spatiotemporal pulse weaving scalar optical hopfions

Li, Chenhui; Wang, Sicong; Li, Xiangping

doi:10.1038/s41377-023-01101-w

Cited by 5 publications

(2 citation statements)

References 5 publications

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“…The radial quantum number ( ) unlocks two intriguing properties: a composite transverse OAM, composed of oppositely directed components, and a nested spatiotemporal topology within the wavepacket’s profile. This unique combination makes STLG wavepackets attractive candidates for exploring complex photonic topologies 23 , 24 , 54 , enabling advanced information transfer and even quantum entanglement 49 – 52 . However, our work also highlights a new challenge: the creation and sorting of ultra-high-order STLG wavepackets 47 , 55 .…”

Section: Discussionmentioning

confidence: 99%

Spatiotemporal optical vortices with controllable radial and azimuthal quantum numbers

Liu,

Cao,

Zhang

et al. 2024

Nat Commun

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Optical spatiotemporal vortices with transverse photon orbital angular momentum (OAM) have recently become a focal point of research. In this work we theoretically and experimentally investigate optical spatiotemporal vortices with radial and azimuthal quantum numbers, known as spatiotemporal Laguerre-Gaussian (STLG) wavepackets. These 3D wavepackets exhibit phase singularities and cylinder-shaped edge dislocations, resulting in a multi-ring topology in its spatiotemporal profile. Unlike conventional ST optical vortices, STLG wavepackets with non-zero $${{{{{\boldsymbol{p}}}}}}$$ p and $${{{{{\boldsymbol{l}}}}}}$$ l values carry a composite transverse OAM consisting of two directionally opposite components. We further demonstrate mode conversion between an STLG wavepacket and an ST Hermite-Gaussian (STHG) wavepacket through the application of strong spatiotemporal astigmatism. The converted STHG wavepacket is de-coupled in intensity in space-time domain that can be utilized to implement the efficient and accurate recognition of ultrafast STLG wavepackets carried various $${{{{{\boldsymbol{p}}}}}}$$ p and $${{{{{\boldsymbol{l}}}}}}.$$ l . This study may offer new insights into high-dimensional quantum information, photonic topology, and nonlinear optics, while promising potential applications in other wave phenomena such as acoustics and electron waves.

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Section: Discussionmentioning

confidence: 99%

Spatiotemporal optical vortices with controllable radial and azimuthal quantum numbers

Liu,

Cao,

Zhang

et al. 2024

Nat Commun

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show abstract

“…9 Methods for generation and manipulation of Stokes vector optical skyrmions. (a) Generating Stokes vector optical skyrmions using the anisotropy of liquid crystals [28] ; (b) generating Stokes vector optical skyrmions with adjustable skyrmion number using ring microcavities [70] ; (c) interconversion between Néeltype and Blochtype Stokes vector optical skyrmions using polarization conversion devices [71] 亮点文章•特邀综述 11 Realizing equiphase line scalar hopfion using spatiotemporal beam shaping techniques [74] 图 10 光学霍普夫子的产生和偏振态分布［32］。 (a)通过对具有斯托克斯矢量斯格明子结构的傍轴光束进行聚焦产生光学霍普夫子； (b)霍普夫子每根 "光丝" 均对应特定的偏振椭圆轨迹，形成霍普夫子矢量光束 Fig. 10 Generation and polarization distribution of optical hopfion [32] .…”

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confidence: 99%

光学斯格明子的产生与调控（特邀）

Zhou Zhikai,

Wang Sicong,

Li Xiangping

2024

光学学报

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Significance The significance of optical skyrmions and the research around them cannot be overstated. Optical skyrmions which are topologically protected spin textures have attracted considerable attention due to their unique properties and potential applications in various fields. The skyrmion is a unified model of nucleons initially proposed by British particle physicist Tony Skyrme in 1962 and behaves like a nanoscale magnetic vortex with intricate textures. Meanwhile, it occupies significant positions in quantum field theory, solidstate physics, and magnetic materials. Skyrmions are widely regarded as efficient information carriers thanks to their unique topological stability, high speed, high density, and low energy consumption. However, generating optically controlled skyrmions remains a significant challenge. Breaking the limitation of topological control for skyrmions will unlock infinite possibilities for the nextgeneration information revolution, including applications in optical communication, information encryption, and topological phase transitions.

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Singular Electromagnetics: From Phase Singularities to Optical Skyrmions and Beyond

Yang,

Jiang,

Wang

et al. 2024

Advanced Physics Research

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Singular electromagnetics, also known as singular optics in the visible spectrum, is a branch of modern electromagnetics/optics that studies the solutions with nontrivial topological features to Maxwell's equations under different boundary conditions. These nontrivial topological features are called optical singularities, which can be viewed as topological defects of electromagnetic (EM) fields, including phase singularities in complex scalar fields, polarization singularities in complex vector fields, 3D topological defects (such as optical skyrmions, merons, hopfions, knots, links, and Möbius strips), and even higher‐dimensional optical singularities. In this manuscript, the definitions, the topological invariants, and the geometric representations of these optical singularities are reviewed. Along the way of the discussion, it is emphasized that how symmetries can impact optical singularities (for phase, polarization and spatiotemporal singularities). Very importantly, it is demonstrated that how a very complex optical singularity (e.g., a skyrmion) can be constructed based on simpler “building block” singularities (e.g., phase and polarization singularities), so that a hierarchical picture on the many diverse topics in singular electromagnetics is built up. This review can be considered a tutorial‐cum‐review article, which can provide a clear and concise physical picture for constantly emergent topics in singular electromagnetics.

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Spatiotemporal pulse weaving scalar optical hopfions

Cited by 5 publications

References 5 publications

Spatiotemporal optical vortices with controllable radial and azimuthal quantum numbers

Spatiotemporal optical vortices with controllable radial and azimuthal quantum numbers

光学斯格明子的产生与调控（特邀）

Singular Electromagnetics: From Phase Singularities to Optical Skyrmions and Beyond

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