Characterization of focusing performance of spiral zone plates with fractal structure
Zang Hua-Ping1, Zheng Cheng-Long1, Ji Zi-Wen1, Fan Quan-Ping2, Wei Lai2, Li Yong-Jie3, Mu Kai-Jun1, Chen Shu1, Wang Chuan-Ke2, Zhu Xiao-Li4, Xie Chang-Qing4, Cao Lei-Feng2, †, Liang Er-Jun1, ‡
       

Schematic view of zone plate in (r 2, θ) coordinate system and (x, y) coordinate system (a) SZP with p = 1, m = 14; (b) FSZP with p = 1, N = 2, S = 3.