Correcting vortex splitting in higher order vortex beams

Neo, Richard; Tan, Shiaw Juen; Zambrana‐Puyalto, Xavier; Leon-Saval, Sergio G.; Bland-Hawthorn, Joss; Molina‐Terriza, Gabriel

doi:10.1364/oe.22.009920

Cited by 27 publications

(19 citation statements)

References 26 publications

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“…As discussed before, similar alterations of a VVB can occur as a consequence of experimental imperfections, and the beam distortion caused by the V -point splitting may play a role in a variety of applications, as for example in material shaping [57]. Reversing the current approach, as in prospect it could be possible to tune the q-plate optical retardation in order to compensate the effect of experimental imperfections and reduce such deformations of the beam profile [58]. Finally, our results may find application in the context of singularimetry; weak fields can indeed be measured by letting them perturb unstable optical fields, and features of materials that have interacted with such beams can be extracted from the pattern formed by split singularities [59].…”

Section: Discussionmentioning

confidence: 98%

Topological features of vector vortex beams perturbed with uniformly polarized light

D’Errico¹,

Maffei²,

Piccirillo³

et al. 2017

Sci Rep

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Optical singularities manifesting at the center of vector vortex beams are unstable, since their topological charge is higher than the lowest value permitted by Maxwell’s equations. Inspired by conceptually similar phenomena occurring in the polarization pattern characterizing the skylight, we show how perturbations that break the symmetry of radially symmetric vector beams lead to the formation of a pair of fundamental and stable singularities, i.e. points of circular polarization. We prepare a superposition of a radial (or azimuthal) vector beam and a uniformly linearly polarized Gaussian beam; by varying the amplitudes of the two fields, we control the formation of pairs of these singular points and their spatial separation. We complete this study by applying the same analysis to vector vortex beams with higher topological charges, and by investigating the features that arise when increasing the intensity of the Gaussian term. Our results can find application in the context of singularimetry, where weak fields are measured by considering them as perturbations of unstable optical beams.

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Section: Discussionmentioning

confidence: 98%

Topological features of vector vortex beams perturbed with uniformly polarized light

D’Errico¹,

Maffei²,

Piccirillo³

et al. 2017

Sci Rep

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“…We studied the transmission of beams with three different phase singularities of order q ¼ À 1, 0, 1. Higher |q| have not been used as the cylindrical symmetry of the beam is experimentally broken when they are focused 44,45 . We have seen that the results can be elucidated from a symmetry perspective.…”

Section: Article Nature Communications | Doi: 101038/ncomms5922mentioning

confidence: 99%

Angular momentum-induced circular dichroism in non-chiral nanostructures

2014

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Circular dichroism, that is, the differential absorption of a system to left and right circularly polarized light, is one of the only techniques capable of providing morphological information of certain samples. In biology, for instance, circular dichroism spectroscopy is widely used to study the structure of proteins. More recently, it has also been used to characterize metamaterials and plasmonic structures. Typically, circular dichorism can only be observed in chiral objects. Here we present experimental results showing that a non-chiral sample such as a subwavelength circular nanoaperture can produce giant circular dichroism when a vortex beam is used to excite it. These measurements can be understood by studying the symmetries of the sample and the total angular momentum that vortex beams carry. Our results show that circular dichroism can provide a wealth of information about the sample when combined with the control of the total angular momentum of the input field.

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“…We can now build instruments for the first time that measure photon OAM reliably as an intrinsic property of stars [5] although commercial SLMs are barely adequate for the task [6]. Photon OAM is also being exploited through vortex coronography to search for faint sources around suppressed bright stars [7].…”

Section: Coronographymentioning

confidence: 99%

Astrophotonics: the future of astronomical instrumentation

Bland-Hawthorn

2015

Cleo: 2015

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Astrophotonics -the interface of photonics and astronomical instrumentation -has already made important contributions to ground-based and space-based instrumentation (space photonics). The early developments built on technologies arising out of telecommunications but, in recent years, astrophotonics has begun to "give back" to traditional photonic fields. The main goals of astrophotonics are to deliver new instruments and science fields for the next generation of telescopes. Examples of the former are multimoded photonic action in large-core fibres, integrated photonic spectrographs, starlight suppression using vortex coronography, and high-performance interferometry across arbitrary sparse apertures. Examples of new science fields include "quantum astronomy" and the detection of photon orbital angular momentum from individual stars. We provide an overview of the expected impact of nanophotonics on the field of astrophotonics.

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Correcting vortex splitting in higher order vortex beams

Cited by 27 publications

References 26 publications

Topological features of vector vortex beams perturbed with uniformly polarized light

Topological features of vector vortex beams perturbed with uniformly polarized light

Angular momentum-induced circular dichroism in non-chiral nanostructures

Astrophotonics: the future of astronomical instrumentation

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