Article Dans Une Revue Optica Année : 2019

Topological transformations of speckles

Résumé

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.

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hal-02186125 , version 1 (17-07-2019)

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Jérôme Gâteau, Ferdinand Claude, Gilles Tessier, Marc Guillon. Topological transformations of speckles. Optica, 2019, 6 (7), pp.914. ⟨10.1364/OPTICA.6.000914⟩. ⟨hal-02186125⟩
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