Depth of focus enhancement of a modified imaging quasi-fractal zone plate.

Depth of focus enhancement of a modified imaging quasi-fractal zone plate.
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DOI:
10.1016/j.optlastec.2012.03.012
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发表时间:
2012-10-01
影响因子:
5
通讯作者:
Yuan, Xiaocong
Yuan, Xiaocong
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Zhang, Qinqin;Wang, Jingang;Wang, Mingwei;Bu, Jing;Zhu, Siwei;Gao, Bruce Z.;Yuan, Xiaocong

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We propose a new parameter w for optimization of foci distribution of conventional fractal zone plates (FZPs) with a greater depth of focus (DOF) in imaging. Numerical simulations of DOF distribution on axis directions indicate that the values of DOF can be extended by a factor of 1.5 or more by a modified quasi-FZP. In experiments, we employ a simple object–lens–image-plane arrangement to pick up images at various positions within the DOF of a conventional FZP and a quasi-FZP, respectively. Experimental results show that the parameter w improves foci distribution of FZPs in good agreement with theoretical predictions.
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