Publication

Phase retrieval from integrated near-field diffraction intensity

Giorgio Margaritondo
2011
Journal Articles

Abstract

We discuss a near-field phase retrieval algorithm working with integrated diffraction intensity as well as a series of tests of its characteristics. Numerical simulations show improved performances compared to the previous algorithm.

Official source

https://infoscience.epfl.ch/entities/publication/4c5bdd29-8720-46ac-80a4-5d6cb597d973

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Giorgio Margaritondo
2011
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/4c5bdd29-8720-46ac-80a4-5d6cb597d973

About this result

Related concepts (11)

Precession electron diffraction

Precession electron diffraction (PED) is a specialized method to collect electron diffraction patterns in a transmission electron microscope (TEM). By rotating (precessing) a tilted incident electron beam around the central axis of the microscope, a PED pattern is formed by integration over a collection of diffraction conditions. This produces a quasi-kinematical diffraction pattern that is more suitable as input into direct methods algorithms to determine the crystal structure of the sample.

Electron backscatter diffraction

Electron backscatter diffraction (EBSD) is a scanning electron microscopy (SEM) technique used to study the crystallographic structure of materials. EBSD is carried out in a scanning electron microscope equipped with an EBSD detector comprising at least a phosphorescent screen, a compact lens and a low-light camera. In this configuration, the SEM incident beam hits the tilted sample. As backscattered electrons leave the sample, they interact with the crystal's periodic atomic lattice planes and diffract according to Bragg's law at various scattering angles before reaching the phosphor screen forming Kikuchi patterns (EBSPs).

Powder diffraction

Powder diffraction is a scientific technique using X-ray, neutron, or electron diffraction on powder or microcrystalline samples for structural characterization of materials. An instrument dedicated to performing such powder measurements is called a powder diffractometer. Powder diffraction stands in contrast to single crystal diffraction techniques, which work best with a single, well-ordered crystal. Diffraction grating The most common type of powder diffraction is with x-rays, the focus of this article although some aspects of neutron powder diffraction are mentioned.

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