Talbot effect in arrays of helical waveguides

We demonstrate that periodic self-imaging of light patterns with certain input periods can be effectively realized in one-dimensional and two-dimensional helical waveguide arrays. The band structure is drastically dependent on the helix radius and period, and the complete collapse of quasi-energy ba...

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Published in:Optics letters 2021-01, Vol.46 (2), p.322-325
Main Authors: Zhan, Kaiyun, Dou, Lichao, Jiao, Ruiyun, Zhang, Wenqian, Liu, Bing
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Language:English
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description We demonstrate that periodic self-imaging of light patterns with certain input periods can be effectively realized in one-dimensional and two-dimensional helical waveguide arrays. The band structure is drastically dependent on the helix radius and period, and the complete collapse of quasi-energy bands occurs for a certain helix radius and period, which strongly affects the intensity carpet and the Talbot length of the Talbot self-imaging effect. Talbot length would extend to infinity, as the helix radius and period approach the corresponding critical values corresponding to the band collapse, where the inversion of intensity distribution between even and odd waveguides is observed for the binary input pattern with /2 phase shift between the adjacent waveguides.
doi_str_mv 10.1364/OL.415326
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title Talbot effect in arrays of helical waveguides
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