Monstar polarization singularities with elliptically-symmetric q-plates

Cvarch, Ben; Khajavi, Behzad; Jones, Joshua; Piccirillo, Bruno; Marrucci, Lorenzo; Galvez, Enrique J.

doi:10.1364/oe.25.014935

Cited by 12 publications

(7 citation statements)

References 43 publications

(83 reference statements)

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“…Strictly related to their topological charge is the socalled line classification of C points, which differentiates them in three types: lemons, stars and monstars [42,43]. The line classification can be understood by looking at the orientation of the polarization ellipse around the singularity, highlighted by the black directors in Fig.…”

Section: B Light's Polarization and C Pointsmentioning

confidence: 99%

Spatial Bunching of Same-Index Polarization Singularities in Two-Dimensional Random Vector Waves

2018

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Topological singularities are ubiquitous in many areas of physics. Polarization singularities are locations at which an aspect of the polarization ellipse of light becomes undetermined or degenerate. At C points the orientation of the ellipse becomes degenerate and lights electric field vector describes a perfect circle in time. In 2D slices of 3D random fields the distribution in space of the C points is reminiscent of that of interacting particles. With near-field experiments we show that when light becomes truly 2D, this has severe consequences for the distribution of C points in space. The most notable change is that the probability of finding two C points with the same topological charge at a vanishing distance is enhanced in a 2D field. This is an unusual finding for any system which exhibits topological singularities as same-charge repulsion is typically observed. All our experimental findings are supported with theory and excellent agreement is found between theory and experiment.

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Section: B Light's Polarization and C Pointsmentioning

confidence: 99%

Spatial Bunching of Same-Index Polarization Singularities in Two-Dimensional Random Vector Waves

2018

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“…Therefore, an SVAP can be designed so to have an optic axis distribution coincident with the required polarization pattern. Besides, SVAPs have already been used successfully for generating monstar disclination patterns [26], by introducing a high enough degree of astigmatism into an otherwise circularly symmetric optic axis distribution.…”

Section: Methods For Generating Asymmetric Monstar Disclinationsmentioning

confidence: 99%

Spatial mode analysis of optical beams carrying monstar disclinations

Vicuña-Hernández

Cardano²,

Darvehi³

et al. 2023

J. Opt.

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Asymmetric polarization disclinations, such as monstars, can be generated in two distinct ways: (i) by an inseparable superposition of three spatial modes bearing optical vortices with circular polarization states; (ii) by using a modulated Poincaré beam, consisting of an inseparable superposition of the same circular polarization states with the fundamental Gaussian beam TEM00 and a single scalar beam exhibiting an azimuthally modulated vortex with an m-fold rotational symmetry. Based on the analysis of the spatial modes indirectly involved into the mix through the latter method, we investigate its capability of spanning as many disclinations as possibile, as well as its capability of enabling eﬀective predictions about the generated patterns, such as relevant geometric features, at the early design stage.

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“…This relationship defines an ellipse with ellipticity a rotated by an angle γ, so that these structures have been called elliptical q-plates, whereas the same relationship for a 1 defines a circle and corresponds to the formula already presented in Section 2. This kind of special q-plate has been successfully utilized for creating "monstar" dislocations [102], i.e., topological polarization structures that are intermediate between a "lemon" and a "star" pattern, as already described in Fig. 9, and to obtain elliptical nodal areas in coherent light beams [103].…”

Section: Fundamental Research On Complex Structured Lightmentioning

confidence: 99%