Design of multilevel spiral phase Fresnel zone plates
"Design of multilevel spiral phase F..." refers methods in this paper
...The multilevel spiral phase FZP is analyzed using standard scalar diffraction formulae  and the corresponding simulated intensity profile along the x direction at the focal plane of the FZP is shown in Fig....
"Design of multilevel spiral phase F..." refers background or methods in this paper
...Recently, a novel passive diffractive optical element, a spiral phase Fresnel zone plate (FZP) was proposed ....
...The generation of a donut beam is proposed and numerically demonstrated by introducing a spiral phase to either the odd or the even half period zones of the FZP proposed in ....
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