Simulation of generation and dynamics of polarization singularities with circular Airy beams

Ye, Dong; Peng, Xinyu; Zhou, Mu; Xin, Yu; Song, Minmin

doi:10.1364/josaa.34.001957

Cited by 15 publications

(3 citation statements)

References 33 publications

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“…1 d. In addition their intermodal phase undertakes a phase rotation , which depends directly on the topological charge of both CAGV scalar components. Such phase rotation has been observed theoretically before and according to Dong Ye et al, it is not attributed to the Gouy phase optical vortices acquire upon propagation in free space 28 . Crucially, it was demonstrated in the context of scalar modes that a coaxial superposition of Laguerre-Gaussian beams give rise to off-axis optical vortices, which upon propagation rotate about the beam axis due to the Gouy phase.…”

Section: Theoretical Backgroundsupporting

confidence: 60%

Experimental generation of arbitrary abruptly autofusing Circular Airy Gaussian vortex vector beams

Zhao

Chen

et al. 2022

Sci Rep

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Complex vector modes represent a general state of light nonseparable in their spatial and polarization degrees of freedom, which have inspired a wide variety of novel applications and phenomena, such as their unexpected propagation behaviour. For example, they can propagate describing periodic polarization transitions, changing from one vector beam to another. Here, we put forward a novel class of vector modes with the capability to experience an abruptly autofocusing behaviour. To achieve such beams, we encode the spatial degree of freedom in the Circular Airy Gaussian vortex (CAGV) beams. We demonstrate the experimental generation of arbitrary CAGV vector beams and evince some of their properties, such as a rotation of intermodal phase. We anticipate that the fascinating properties of theses modes will prompt the development of novel applications associated to their autofocusing behaviour and polarization distribution.

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Section: Theoretical Backgroundsupporting

confidence: 60%

Experimental generation of arbitrary abruptly autofusing Circular Airy Gaussian vortex vector beams

Zhao

Chen

et al. 2022

Sci Rep

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“…In addition, ring-Airy beams exhibit self-healing characteristics similar to those of Bessel beams, allowing for their reconstruction after encountering an obstacle [13]. Properties related to the vorticity [14][15][16][17], coherence [18][19][20], manipulation of nanoparticles [21][22][23] and polarization [24][25][26] have also been studied for different types of ring-Airy beams.…”

Section: Introductionmentioning

confidence: 99%

Laser energy deposition with ring-Airy beams beyond kilometer range in the atmosphere

Zou,

Sun,

et al. 2023

Phys. Rev. A

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Controlled deposition of high laser-power density at remote distances still remains a challenge. Previous experimental works using terawatt peak-power laser systems to initiate filamentation at distances of hundreds or even thousands of meters in the atmosphere have documented limited control on laser energy deposition due to the effects of diffraction and turbulence. In this work, we demonstrate a promising scenario for the projection of high power densities at kilometric distances in air, which requires multiple-gigawatt laser pulses reshaped into ring-Airy beams. We show that a power distribution over a relatively large primary ring accompanied by the inward power flux characterizing a ring-Airy beam limits the occurrence of nonlinear effects to the vicinity of the focal point. Close to focus, self-focusing sets in, which accelerates the convergence process of the beam. We quantify the influence of self-focusing on the focal shift and propose an empirical law that fits our numerical simulation results for the position of the nonlinear focus as a function of the input power and the apodization factor of the ring-Airy beam. We show that once the intensity of the beam exceeds the ionization threshold of air, a short filament is generated whose power content rather accurately corresponds to the critical power for self-focusing, independent of the input parameters.

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“…Polarization singularities have been theoretically studied in various systems including electric and magnetic fields of paraxial waves [20,21], Gaussian beams [22] and * shubwang@cityu.edu.hk general 3D fields [23]. Generation and observation of polarization singularities have also been achieved experimentally [24][25][26][27][28][29][30][31][32][33][34]. These studies have uncovered many interesting topological properties of polarization singularities [11,23,35,36].…”

Section: Introductionmentioning

confidence: 99%

Polarization Singularities in Light Scattering by Small Particles

Peng,

Liu,

Wang

2020

Preprint

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Using full-wave numerical simulations and analytical multipole expansions we investigated the properties of real-space polarization singularities that emerge in light scattering by subwavelength particles. We considered spherical and torus particles made of dielectric or perfect-electric-conductor material. We determined the topological indices and the trajectories of electric-field polarization singularities in both the near-field and far-field regions. In the far-field region, a total of four singularities are identified and the sum of their polarization topological indices is two, independent of the particle's geometric shape. In the near-field region, the polarization singularities strongly depend on the particle's shape and the polarization of incident light, and their index sum is not governed by the Poincaré-Hopf theorem anymore due to the non-transverse nature of the fields. From near field to far field, a flipping of sign can happen to the polarization topological indices of the C lines. The far-field properties of the singularities can be well explained by the interference of the excited multipoles, but their near-field properties can be strongly affected by the evanescent fields that are not captured by the multipole expansions. Our work uncovers the important relationship between particles' geometric properties and the polarization singularities of their scattering field. The results can be applied to manipulate polarization singularities in nanophotonic systems and could generate novel applications in optical sensing.

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Simulation of generation and dynamics of polarization singularities with circular Airy beams

Cited by 15 publications

References 33 publications

Experimental generation of arbitrary abruptly autofusing Circular Airy Gaussian vortex vector beams

Experimental generation of arbitrary abruptly autofusing Circular Airy Gaussian vortex vector beams

Laser energy deposition with ring-Airy beams beyond kilometer range in the atmosphere

Polarization Singularities in Light Scattering by Small Particles

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