Generation of optical vortices with arbitrary shape and array via helical phase spatial filtering |
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Authors: | Cheng-Shan Guo Yan Zhang Jian-Ping Ding |
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Affiliation: | a Department of Physics, Shandong Normal University, Wenhua East Street 88, Jinan 250014, China b Department of Physics, Nanjing University, Nanjing 210093, China |
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Abstract: | We report a method for generation of arbitrary shape and array of optical vortices by use of a superposition of coherent elementary vortices based on helical phase spatial filtering in spatial frequency domain. In this method, a helical phase spatial filter (HPSF) is placed in the spatial frequency plane of a 4-f imaging processing system. We demonstrated that the output field distribution represents the convolution between the input field and an elementary vortex field introduced by the HPSF, which results in a special shape or array of optical vortices determined by the “degenerate” properties of coherent elementary vortices and the distribution formats of the input field. |
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Keywords: | 42.30.Kq 42.79.Ci 42.79.Hp 87.80.Cc 87.80.Fe |
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