Observation of the dynamical inversion of the topological charge of an optical vortex

Molina-Terriza, Gabriel; Recolons, Jaume; Torres, Juan P.; Torner, Lluís; Wright, E. M.

doi:10.1887/0750309016/b1142c22

Cited by 7 publications

(8 citation statements)

References 11 publications

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“…Generation approaches include dynamic phase in the form of spiral phases, usually encoded on spatial light modulators [14,15], geometric phase in the form of liquid crystals [16,17] or meta-surfaces [18], non-spiral phase plates [19] and a suite of approaches for intra-cavity generation [20]. Coupled to this has been recent interest in tailoring OAM fields in 3D for the demonstration of exotic propagation characteristics [21][22][23][24][25][26][27][28][29][30][31] as well as encoding fractional OAM on the field [32].…”

Section: Introductionmentioning

confidence: 99%

Generation of structured light by multilevel orbital angular momentum holograms

et al. 2019

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Structured light has been created by a myriad of near-and far-field techniques and has found both classical and quantum applications. In the case of orbital angular momentum (OAM), continuous spiral phase patterns in dynamic or geometric phase are often employed with the phase patterns existing across the entire transverse plane. Here we exploit the uncertainty relation between OAM and angle to create structured OAM fields using multilevel OAM holograms. We show theoretically and experimentally that only a multilevel angular phase contour in the near-field is needed to create structured OAM light in the far-field, exploiting the reciprocal nature of angular momentum and angle. We use this approach to demonstrate exotic 3D structured light control to show the evolution of the Poynting vector in such fields and to highlight the physics underlying this phenomenon.

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Section: Introductionmentioning

confidence: 99%

Generation of structured light by multilevel orbital angular momentum holograms

et al. 2019

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“…Another exciting application is the use of a socalled vortex coronograph to detect faint signals nearby bright stellar objects [12,13] and such a device was used to detect the weak reflection of exoplanets located very close to a bright star [14]. Besides technological applications, optical vortex beams also provoke many interesting fundamental issues and more complicated arrangements of the phase discontinuity in three dimensions can be studied [15,16]. Apart from optics, vortex beams have been produced and used with radiowaves [17], acoustical waves [18] and X-rays [19,20] each having its own potential for exciting applications.…”

Section: Introductionmentioning

confidence: 99%

A new way of producing electron vortex probes for STEM

2012

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A spiral holographic aperture is used in the condensor plane of a scanning transmission electron microscope to produce a focussed electron vortex probe carrying a topological charge of either −1, 0 or +1. The spiral aperture design has a major advantage over the previously used forked aperture in that the three beams with topological charge m = −1, 0, 1 are not side by side in the specimen plane, but rather on top of each other, focussed at different height. This allows us to have only one selected beam in focus on the sample while the others contribute only to a background signal. In this paper we describe the working principle as well as first experimental results demonstrating atomic resolution HAADF STEM images obtained with electron vortex probes. These results pave the way for atomic resolution magnetic information when combined with electron energy loss spectroscopy.

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“…Apart from phase singularities, phase dipoles, phase extrema, and phase saddles may also occur. These different structures can exist arbitrarily close to one another, and can in fact be created or annihilated in so-called topological reactions, see for example [2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Topological reactions of correlation functions in partially coherent electromagnetic beams

2013

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It was recently shown that so-called coherence vortices, singularities of the two-point correlation function, generally occur in partially coherent electromagnetic beams. We study the three-dimensional structure of these singularities and show that in successive cross sections of a beam a rich variety of topological reactions takes place. These reactions involve, apart from vortices, the creation or annihilation of dipoles, saddles, maxima and minima of the phase of the correlation function. Since these reactions happen generically, i.e., under quite general conditions, these observations have implications for interference experiments with partially coherent, electromagnetic beams.

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Observation of the dynamical inversion of the topological charge of an optical vortex

Cited by 7 publications

References 11 publications

Generation of structured light by multilevel orbital angular momentum holograms

Generation of structured light by multilevel orbital angular momentum holograms

A new way of producing electron vortex probes for STEM

Topological reactions of correlation functions in partially coherent electromagnetic beams

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