title: Translation position determination in ptychographic coherent diffraction imaging.
abstract: Accurate knowledge of translation positions is essential in ptychography to achieve a good image quality and the diffraction limited resolution. We propose a method to retrieve and correct position errors during the image reconstruction iterations. Sub-pixel position accuracy after refinement is shown to be achievable within several tens of iterations. Simulation and experimental results for both optical and X-ray wavelengths are given. The method improves both the quality of the retrieved object image and relaxes the position accuracy requirement while acquiring the diffraction patterns.
authors.affiliation: London Centre for Nanotechnology, UCL, London, UK. fucai.zhang@ucl.ac.uk
authors.forename: Fucai
authors.initials: F
authors.lastname: Zhang
authors.forename: Isaac
authors.initials: I
authors.lastname: Peterson
authors.forename: Joan
authors.initials: J
authors.lastname: Vila-Comamala
authors.forename: Ana
authors.initials: A
authors.lastname: Diaz
authors.forename: Felisa
authors.initials: F
authors.lastname: Berenguer
authors.forename: Richard
authors.initials: R
authors.lastname: Bean
authors.forename: Bo
authors.initials: B
authors.lastname: Chen
authors.forename: Andreas
authors.initials: A
authors.lastname: Menzel
authors.forename: Ian K
authors.initials: IK
authors.lastname: Robinson
authors.forename: John M
authors.initials: JM
authors.lastname: Rodenburg