title: Possibility of high-resolution ptychographic iterative imaging with low energy electrons: dynamical calculations.
abstract: Ptychographic iterative engine (PIE), a form of coherent diffractive imaging in which the phase of both low-angle and high-angle diffraction data is used to form an image without a lens, can in principle deliver wavelength-limited resolution. Working at low accelerating voltages (30 keV) reduces specimen knock-on damage, increases high-resolution contrast and allows a scanning electron microscope to be used as a transmission electron microscopy. However, electrons are very strongly scattered at low energy. To that end, the effect of dynamical scattering on PIE at low accelerating voltages is calculated to illustrate the possibility of generating high-resolution images with low energy electrons.
authors.affiliation: School of Sciences, Jiangnan University, Wuxi, China Department of Physics and Astronomy, KU Leuven, Heverlee, Belgium.
authors.forename: Ling
authors.initials: L
authors.lastname: Wang
authors.affiliation: School of Sciences, Jiangnan University, Wuxi, China Department of Electronic and Electric Engineering, University of Sheffield, Sheffield, UK cheng.liu@hotmail.co.uk.
authors.forename: Cheng
authors.initials: C
authors.lastname: Liu
authors.affiliation: Department of Electronic and Electric Engineering, University of Sheffield, Sheffield, UK.
authors.forename: John M
authors.initials: JM
authors.lastname: Rodenburg
keywords: coherent diffractive imaging; dynamical scattering; electron microscope; high-resolution microscopy; low energy electrons; ptychography