The realization of long focal depth with a linear varied-area zone plate. Issue 3 (4th February 2017)

• Record Type: Journal Article
• Authors: Fan, Quanping; Wang, Shaoyi; Yang, Zuhua; Wei, Lai; Hu, Feng; Zang, Huaping; Zhang, Qiangqiang; Wang, Chuanke; Jiang, Gang; Cao, Leifeng
• Is Part Of: Journal of modern optics. Volume 64:Issue 3(2017)
• Page Start: 244
• Page End: 250
• Publication Date: 2017-02-04
• Subjects: Long focal depth -- zone plate -- diffractive optics; Optics -- Periodicals; 535
• DOI: 10.1080/09500340.2016.1229504
• Languages: English
• ISSNs: 0950-0340

Abstract

Abstract: 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.