Dynamics of polarization singularities in composite optical vortices

Lopez-Mago, Dorilian; Perez-García, Benjamin; Yepiz, Adad; Hernández-Aranda, Raúl I.; Gutiérrez-Vega, Julio C.

doi:10.1088/2040-8978/15/4/044028

Cited by 22 publications

(10 citation statements)

References 28 publications

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“…In a perfect analogy to the Poincaré sphere for polarization, we use polar coordinates to map both the local UP-LP content imbalance and relative phase between the UP and LP fields. Similarly to the Stokes parameter s 3 60 , the content imbalance parameter…”

Section: Polariton Bloch Sphere Mappingmentioning

confidence: 99%

“…They are composed of a closed ring and a bent open line (i.e., the line closed at infinite distance) that eventually intersect and merge (in some panels, they become two closed loops and one open line). Conditions for their intersection and detachments are described in a previous work on the positioning of polarization singularities 60 . In the case of the moving polariton vortex packets, their evolution is due to the linear increase of the relative distance d LU in time and the global population imbalance S decrease according to the exponential decay of the two polariton yielding S(t) = tanh{−γ LU t − atanh[S(0)]}.…”

Section: Relative Decay and Asymmetric Dynamicsmentioning

confidence: 99%

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Shaping the topology of light with a moving Rabi-oscillating vortex

Dominici,

Voronova,

Colas

et al. 2021

Preprint

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Quantum vortices are the analogue of classical vortices in optics, Bose-Einstein condensates, superfluids and superconductors, where they provide the elementary mode of rotation and orbital angular momentum. While they mediate important pair interactions and phase transitions in nonlinear fluids, their linear dynamics is useful for the shaping of complex light, as well as for topological entities in multi-component systems, such as full-Bloch beams. Here, setting a quantum vortex into directional motion in an open-dissipative fluid of microcavity polaritons, we observe the self-splitting of the packet, leading to the trembling movement of its center of mass, whereas the vortex core undergoes ultrafast spiraling along diverging and converging circles, in a sub-picosecond precessing fashion. This singular dynamics is accompanied by vortex-antivortex pairs creation and annihilation, and a periodically changing topological charge. The spiraling and branching mechanics represent a direct manifestation of the underlying Bloch pseudospin space, whose mapping is shown to be rotating and splitting itself. Its reshaping is due to three simultaneous drives along the distinct directions of momentum and complex frequency, by means of the differential group velocities, Rabi frequency and dissipation rates, which are natural assets in coupled fields such as polaritons. This state, displaying linear momentum dressed with oscillating angular momentum, confirms the richness of multi-component and open quantum fluids and their innate potentiality to implement sophisticated and dynamical topological textures of light, also going beyond pure homeomorphisms.

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Section: Polariton Bloch Sphere Mappingmentioning

confidence: 99%

Section: Relative Decay and Asymmetric Dynamicsmentioning

confidence: 99%

Shaping the topology of light with a moving Rabi-oscillating vortex

Dominici,

Voronova,

Colas

et al. 2021

Preprint

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show abstract

“…Кроме того, в работе этих же авторов [3] показано, что число вихрей в суперпозиции двух параллельных пучков ЛГ может меняться при распространении в пространстве, хотя суммарный топологический заряд остаётся неизменным. В работе [4] изучается суперпозиция двух внеосевых оптических вихрей, но с ортогональной поляризацией. Вместо динамики фазовых сингулярностей, в этой работе изучается динамика поляризационных сингулярностей и положение C-точек в зависимости от расстояния между вихрями, их топологического заряда, а также фазовой задержки между ними.…”

Section: Introductionunclassified

Topological charge of a superposition of identical parallel single-ringed Laguerre-Gaussian beams

2022

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We study a superposition of several identical parallel single-ringed Laguerre-Gaussian beams. Both for the initial plane and for the far field, we show analytically and confirm numerically that if the weighting coefficients of the superposition are real-valued (i.e. all the beams have the same phase, but may have different amplitudes), the net topological charge of the superposition is equal to the topological charge of each constituent beam. It is also shown that a phase delay between the beams allows changing the net topological charge of the superposition. By measuring the net topological charge it is possible to analyze the received optical signal in a data transmission system that utilizes vortex beams, combining spatial multiplexing and orbital angular momentum multiplexing.

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“…In the past, the analysis of even simple, classical polarization structures, realized by e.g. q‐plates, the superposition of off‐axis optical vortices with orthogonal polarization, or superimposed cylindrical vector beams, proved a great variety of complex, three‐dimensional polarization and singularity topologies. Moreover, it was demonstrated that singularity evolution can be affected by e.g.…”

Section: Introductionmentioning

confidence: 99%

Polarization Singularity Explosions in Tailored Light Fields

Otte

Alpmann

Denz

2018

Laser & Photonics Reviews

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Complex propagation dynamics of higher‐order polarization singularities are investigated within tailored Poincaré beams. Spatial polarization modulation and additional phase vortices of higher strength are combined, evoking polarization singularity splitting, type conversion, creation and annihilation. These phenomena form singularity “explosions” along their longitudinal evolution. These dynamics of propagating customized light fields and embedded singularities are analyzed experimentally and numerically. Furthermore, similarities of polarization singularity explosion and phase vortex unfolding are discussed, exploring fundamental propagation and spatio‐temporal interaction properties of optical singularities.

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Dynamics of polarization singularities in composite optical vortices

Cited by 22 publications

References 28 publications

Shaping the topology of light with a moving Rabi-oscillating vortex

Shaping the topology of light with a moving Rabi-oscillating vortex

Topological charge of a superposition of identical parallel single-ringed Laguerre-Gaussian beams

Polarization Singularity Explosions in Tailored Light Fields

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