Phase retrieval using radiation and matter-wave fields: Validity of Teague's method for solution of the transport-of-intensity equation

Title
Phase retrieval using radiation and matter-wave fields: Validity of Teague's method for solution of the transport-of-intensity equation
Publication Date
2011
Author(s)
Schmalz, Jelena
Gureyev, Timur
( author )
OrcID: https://orcid.org/0000-0002-1103-0649
Email: tgureyev@une.edu.au
UNE Id une-id:tgureyev
Paganin, David
Pavlov, Konstantin M
( author )
OrcID: https://orcid.org/0000-0002-1756-4406
Email: kpavlov@une.edu.au
UNE Id une-id:kpavlov
Type of document
Journal Article
Language
en
Entity Type
Publication
Publisher
American Physical Society
Place of publication
United States of America
DOI
10.1103/PhysRevA.84.023808
UNE publication id
une:8572
Abstract
Although originally developed for coherent paraxial scalar electromagnetic radiation in the visible-light regime, phase retrieval using the transport-of-intensity equation has been successfully applied to a range of paraxial radiation and matter-wave fields. Such applications include using electron wave fields to quantitatively image magnetic skyrmions and spin ices, propagation-based phase-contrast imaging using cold neutrons and hard x-rays, and visible-light refractive imaging of the projected column density of cold-atom clouds. Teague's method for phase retrieval using the transport-of-intensity equation, which renders the phase of a paraxial complex wave indirectly measurable via the existence of a conserved current, has been applied to a broad variety of situations which include all of the experiments described above. However, these applications have been undertaken without a thorough analysis of the underlying validity of the method. Here we derive sufficient conditions for the phase-retrieval solution provided by Teague's method to coincide with the true phase of the paraxial radiation or matter-wave field. We also present a sufficient condition guaranteeing that the discrepancy between the true phase function and that reconstructed using Teague's solution is small. These conditions demonstrate that, in most practical cases, for phase-amplitude retrieval using the transport-of-intensity equation, the Teague solution is very close to the exact solution. However, we also describe a counter example in the context of phase-amplitude retrieval using hard x-rays, in which the relative root-mean-square difference between the exact solution and that obtained using Teague's method is 9%. These findings clarify the foundations of one of the most widely applied methods for propagation-based phase retrieval of both paraxial matter and radiation wave fields and define a region for its applicability.
Link
Citation
Physical Review A (Atomic, Molecular and Optical Physics), 84(2), p. 023808-1-023808-10
ISSN
1094-1622
1050-2947
2469-9934
2469-9926
Start page
023808-1
End page
023808-10

Files:

NameSizeformatDescriptionLink