The realization of long focal depth with a linear varied-area zone plate

We report a linear varied-area zone plate, in which arbitrary long focal depth can be achieved by properly adjusting the corresponding parameters. Meanwhile, the lateral focal spot and side lobes can be kept very small. Numeral simulations are carried out to verify the performance of our zone plate...

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Bibliographic Details
Published inJournal of modern optics Vol. 64; no. 3; pp. 244 - 250
Main Authors Fan, Quanping, Wang, Shaoyi, Yang, Zuhua, Wei, Lai, Hu, Feng, Zang, Huaping, Zhang, Qiangqiang, Wang, Chuanke, Jiang, Gang, Cao, Leifeng
Format Journal Article
LanguageEnglish
Published Abingdon Taylor & Francis 04.02.2017
Taylor & Francis Ltd
Subjects
diffractive optics
Long focal depth
Microscopes
Optics
zone plate
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Summary:We report a linear varied-area zone plate, in which arbitrary long focal depth can be achieved by properly adjusting the corresponding parameters. Meanwhile, the lateral focal spot and side lobes can be kept very small. Numeral simulations are carried out to verify the performance of our zone plate through Fresnel-Kirchhoff diffraction theory, and the results are in good accord with the experimental verifications. The influences of our zone plate's parameters to the intensity distribution in focal region are discussed in detail. Comparisons are made with the behaviour of a linear varied-line-space grating, and we find that the behaviour of our novel zone plate along optical axis is just like a reverse transformation of the focusing behaviour of a linear varied-line-space grating.
ISSN:0950-0340
1362-3044
DOI:10.1080/09500340.2016.1229504