Angular spectrum simulation of X‐ray focusing by Fresnel zone plates. (17th March 2013)

• Record Type: Journal Article
• Authors: Vila‐Comamala, Joan; Wojcik, Michael; Diaz, Ana; Guizar‐Sicairos, Manuel; Kewish, Cameron M.; Wang, Steve; David, Christian
• Is Part Of: Journal of synchrotron radiation. Volume 20:Part 3(2013)
• Page Start: 397
• Page End: 404
• Publication Date: 2013-03-17
• Subjects: diffractive X‐ray optics -- X‐ray wavefield modeling -- angular spectrum method -- Fresnel zone plate stacking; Synchrotron radiation -- Periodicals; Free electron lasers -- Periodicals; 539.73505
• DOI: 10.1107/S090904951300263X
• Languages: English
• ISSNs: 0909-0495

Abstract

Abstract : A computing simulation routine to model any type of circularly symmetric diffractive X‐ray element has been implemented. The wavefield transmitted beyond the diffractive structures is numerically computed by the angular spectrum propagation method to an arbitrary propagation distance. Cylindrical symmetry is exploited to reduce the computation and memory requirements while preserving the accuracy of the numerical calculation through a quasi‐discrete Hankel transform algorithm, an approach described by Guizar‐Sicairos & Gutierrez‐Vega [ J. Opt. Soc. Am. A, (2004), 21, 53–58]. In particular, the code has been used to investigate the requirements for the stacking of two high‐resolution Fresnel zone plates with an outermost zone width of 20 nm.