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Sabatyan A, Meshginqalam B. Generation of circular vortex and Bessel beam by a corrected-phase Fresnel zone plate. ICOP & ICPET _ INPC _ ICOFS 2015; 21 :1137-1140
URL: http://opsi.ir/article-1-604-en.html
URL: http://opsi.ir/article-1-604-en.html
Abstract: (3268 Views)
In this paper, focusing properties of a radially shifted zone plate was examined. This FZP can turn an incident plane wave into an annular beam at its focal plane. High efficiency and flexibility are the advantages of this method. By performing direct calculations, it is shown that a radially shifted zone plate produces annulus focus. All results are completely verified by experiments. Finally, it is clearly revealed that at a certain distance from the focal plane, an annular beam is transformed into a Bessel beam, and a focal line is formed.
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