Wolf effect in the scattering of polychromatic radiation by two spheres having parity-time symmetry

Vieira, R A; Brandão, P. A.

doi:10.1088/2040-8986/abc1c7

Cited by 4 publications

(3 citation statements)

References 44 publications

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“…We note that the previous studies, e.g., in Refs. [54,[60][61][62][63][64], were focused on the scalar incident beam, i.e., no polarization properties are considered. As far as we know, this paper has established the first framework for the weak scattering of partially coherent vector light with the PT-symmetric medium.…”

Section: Discussionmentioning

confidence: 99%

“…For a radially polarized incident beam we consider in the simulation (see Section 3.2), the fields on the two-point positions of a dipole scatterer considered in Refs. [54,[60][61][62] have the same polarization. Thus, in this work we consider that the scatterer is composed by two pairs of point dipole.…”

Section: Four-point Scatterermentioning

confidence: 99%

“…The PT symmetry in optics has found numerous applications, such as in unidirectional invisibility, anisotropic transmission resonances, single-particle detection, microlaser, robust wireless power transfer, and topological insulators [58,59]. The partially coherent Gaussian Schell-model beam scattered by the PT deterministic media, such as the two-point scatterers [54,[60][61][62], localized continuous materials [63], and periodic materials with loss and gain [64] have been studied. It has been shown that the non-Hermitian property of the scattering potential induces anomalous spectral and spatial changes in the partially coherent scattered fields.…”

Section: Introductionmentioning

confidence: 99%

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Scattering of Partially Coherent Vector Beams by a Deterministic Medium Having Parity-Time Symmetry

et al. 2022

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We study the scattering properties of the partially coherent vector beams with the deterministic media having the classic symmetric and parity-time (PT) symmetric scattering potential functions. The closed-form expressions for the intensity and polarization matrix of the far-zone scattered field are obtained, under first-order Born approximation, when the partially coherent vector beams are taken to be radially polarized and the deterministic media are assumed as the four-point scatterers. We demonstrate both analytically and numerically that the far-zone scattered field becomes noncentrosymmetric and the directionality appears in the scattering pattern when the scattering potential function is switched from classic symmetry to PT symmetry. We show the effect of spatial coherence of the incident partially coherent vector beam on the directionality in scattering. We find that by turning the symmetry property of the spatial coherence function of the incident beam, i.e., into PT symmetry, the directionality in the far-zone scattering can be suppressed or enhanced, depending on the joint effect from the symmetry of the scattering potential and the symmetry of the spatial coherence. Our findings may be useful in the application of dynamic control of the directionality in light scattering.

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Section: Discussionmentioning

confidence: 99%

Section: Four-point Scatterermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Scattering of Partially Coherent Vector Beams by a Deterministic Medium Having Parity-Time Symmetry

et al. 2022

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Propagation of partially coherent light in non-Hermitian lattices

Brandão

Rocha

2022

Phys. Rev. A

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Scattering of partially coherent vortex beams by a $\mathcal {PT}$-symmetric dipole

2021

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We investigated the statistical properties of partially coherent optical vortex beams scattered by a dipole, consisting of a pair of point particles having balanced gain and loss. The formalism of second-order classical coherence theory is adopted, together with the first Born approximation, to obtain the cross-spectral density of the scattered field. It is shown that the radiated pattern depends strongly on the coherence properties of the incident beam and on the non-Hermitian properties of the dipole. The spectral density for the scattered radiation is ruled by two terms, one associated to the vortex structure and the other independent of the topological charge, and the competition between these terms dictates the directional properties of the scattered radiation. When they have same order of magnitude, the scattered profile resembles that of an incoherent system, with radiation being emitted in all directions in the three-dimensional space, regardless of the dipole’s gain and loss properties. Depending on the gain and loss present in the dipole, the system may scatter light in some preferable directions. All of these effects are accompanied by a change in the spectral degree of coherence of the scattered field.

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Wolf effect in the scattering of polychromatic radiation by two spheres having parity-time symmetry

Cited by 4 publications

References 44 publications

Scattering of Partially Coherent Vector Beams by a Deterministic Medium Having Parity-Time Symmetry

Scattering of Partially Coherent Vector Beams by a Deterministic Medium Having Parity-Time Symmetry

Propagation of partially coherent light in non-Hermitian lattices

Scattering of partially coherent vortex beams by a $\mathcal {PT}$-symmetric dipole

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