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J Opt Soc Am A Opt Image Sci Vis. 2013 Feb 1;30(2):233-7. doi: 10.1364/JOSAA.30.000233.

Fractional spiral zone plates.

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  • 1Research Center of Laser Fusion, National Key Laboratory of Laser Fusion, China Academy of Engineering Physics, P.O. Box 919-986, Mianyang, Sichuan 621900, China.


In this paper, we generalize the concept of classical spiral zone plates (SZPs) to fractional spiral zone plates (FSZPs). By using an SZP with a fractional topological charge and controlling the starting orientation, we can break down the symmetry of the focusing process to give orientation-selective anisotropic vortex foci. Numerical results show that its binary structure gives additional high-order foci on the optical axis and the intensities in the foci can be controlled by properly choosing the fractional topological charge. Our study reveals the feasibility to control the intensity in the foci by means of FSZPs.

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