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Generation of optical vortex array based on the fractional Talbot effect

✍ Scribed by Gong-Xiang Wei; Lei-Lei Lu; Cheng-Shan Guo

Publisher
Elsevier Science
Year
2009
Tongue
English
Weight
803 KB
Volume
282
Category
Article
ISSN
0030-4018

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✦ Synopsis

A phase-only diffractive optical element (DOE) for generating array of optical vortices with high compression ratio is presented. Since it is designed according to the fractional Talbot effect, we name the DOE optical vortex Talbot array illuminator (OVTAI). As an example, an OVTAI for generating a hexagonal array of optical vortices is designed, and demonstrated through displaying the OVTAI on a programmable liquid crystal spatial light modulator. The diffraction properties of the vortex array generated by the OVTAI are observed and analyzed, and an optimal distance for generating sharp ringed vortex arrays is given.

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## Abstract A new design of quasi‐optical (QO) power divider at millimeter wave band is presented in this article. The Talbot Effect of periodical phase grating is applied to realize power dividing with high efficiency. A novel periodic phase profile was adopted to make a linear region of zero diff