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

作者：Zhang, Qinqin; Wang, Jingang; Wang, Mingwei; Bu, Jing; Zhu, Siwei; Gao, Bruce Z.; Yuan, Xiaocong^*

来源：Optics and Laser Technology, 2012, 44(7): 2140-2144.

DOI：10.1016/j.optlastec.2012.03.012

• Fractal zone plate
• DOF
• Quasi-FZP

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.

• 出版日期2012-10
• 单位南开大学; 天津市人民医院