31 October 2016 Generation of speckle vortices by Archimedes' spiral micro-holes
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Speckle plays an important role in the optical field. Optical vortices which exist in random speckle fields usually contain useful phase information. The distribution of speckle field is determined by these optical vortices. In order to study speckle vortices quantitatively, we established a micro-holes array model based on the law of Archimedes’ spiral arrangement. Speckle vortices can be generated by the random diffuse reflection points (spiral micro-holes). In the experiments, the gray image of Archimedes’ spiral micro-holes are displayed on the screen of liquid crystal spatial light modulator (LC-SLM), and the output optical field is captured by a CCD camera. The numerical simulations and experimental results show that the model can be used to generate speckle vortices.
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Haibin Sun, Haibin Sun, Tingting Liu, Tingting Liu, Jun Chen, Jun Chen, Ping Sun, Ping Sun, } "Generation of speckle vortices by Archimedes' spiral micro-holes", Proc. SPIE 10022, Holography, Diffractive Optics, and Applications VII, 100221O (31 October 2016); doi: 10.1117/12.2243843; https://doi.org/10.1117/12.2243843

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