Topological transformations of speckles

Deterministic control of coherent random light is highly important for information transmission through complex media. However, only a few simple speckle transformations can be achieved through diffusers without prior characterization. As recently shown, spiral wavefront modulation of the impinging...

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Bibliographic Details
Published in:Optica 2019-07, Vol.6 (7), p.914
Main Authors: Gateau, Jérôme, Claude, Ferdinand, Tessier, Gilles, Guillon, Marc
Format: Article
Language:English
Subjects:
Optics
Physics
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Summary:Deterministic control of coherent random light is highly important for information transmission through complex media. However, only a few simple speckle transformations can be achieved through diffusers without prior characterization. As recently shown, spiral wavefront modulation of the impinging beam allows permuting intensity maxima and intrinsic ±1-charged optical vortices. Here, we study this cyclic-group algebra when combining spiral phase transforms of charge n, with D 3-and D 4-point-group symmetry star-like amplitude modulations. This combination allows statistical strengthening of permutations and controlling the period to be 3 and 4, respectively. Phase saddle-points are shown to complete the cycle. These results offer new tools to manipulate critical points in speckles.
ISSN:2334-2536
2334-2536
DOI:10.1364/OPTICA.6.000914