Numerical study of Bragg CDI on thick polycrystalline specimens

Research output: Contribution to journalJournal article – Annual report year: 2018Researchpeer-review

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Numerical study of Bragg CDI on thick polycrystalline specimens. / Pedersen, Anders Filsøe; Chamard, Virginie; Poulsen, Henning Friis.

In: Optics Express, Vol. 26, No. 18, 2018, p. 23411-23425.

Research output: Contribution to journalJournal article – Annual report year: 2018Researchpeer-review

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@article{52e935d7f8ea4adcace7ebcd5eeca08e,
title = "Numerical study of Bragg CDI on thick polycrystalline specimens",
abstract = "Bragg coherent diffraction imaging (BCDI) is a powerful X-ray imaging technique for crystalline materials, providing high resolution maps of structure and strain. The technique is typically used to study a small isolated object, and is in general not compatible with a bulk polycrystalline sample, due to overlap of diffraction signals from various crystalline elements. In this paper, we present an imaging method for bulk samples, based on the use of a coherent source. The diffracted X-ray beam from a grain or domain of choice is magnified by an objective before being monitored by a 2D detector in the far field. The reconstruction principle is similar to the case of BCDI, while taking the magnification and pupil function into account. The concept is demonstrated using numerical simulations and reconstructions. We find that by using an object-lens distance shorter than the focal length, the numerical aperture is larger than in a traditional imaging geometry. and at the same time the setup is insensitive to small phase errors by lens imperfections. According to our simulations, we expect to be able to achieve a spatial resolution smaller than 20 nm when using the objective lens in this configuration. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement",
author = "Pedersen, {Anders Fils{\o}e} and Virginie Chamard and Poulsen, {Henning Friis}",
year = "2018",
doi = "10.1364/OE.26.023411",
language = "English",
volume = "26",
pages = "23411--23425",
journal = "Optics Express",
issn = "1094-4087",
publisher = "The Optical Society",
number = "18",

}

RIS

TY - JOUR

T1 - Numerical study of Bragg CDI on thick polycrystalline specimens

AU - Pedersen, Anders Filsøe

AU - Chamard, Virginie

AU - Poulsen, Henning Friis

PY - 2018

Y1 - 2018

N2 - Bragg coherent diffraction imaging (BCDI) is a powerful X-ray imaging technique for crystalline materials, providing high resolution maps of structure and strain. The technique is typically used to study a small isolated object, and is in general not compatible with a bulk polycrystalline sample, due to overlap of diffraction signals from various crystalline elements. In this paper, we present an imaging method for bulk samples, based on the use of a coherent source. The diffracted X-ray beam from a grain or domain of choice is magnified by an objective before being monitored by a 2D detector in the far field. The reconstruction principle is similar to the case of BCDI, while taking the magnification and pupil function into account. The concept is demonstrated using numerical simulations and reconstructions. We find that by using an object-lens distance shorter than the focal length, the numerical aperture is larger than in a traditional imaging geometry. and at the same time the setup is insensitive to small phase errors by lens imperfections. According to our simulations, we expect to be able to achieve a spatial resolution smaller than 20 nm when using the objective lens in this configuration. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

AB - Bragg coherent diffraction imaging (BCDI) is a powerful X-ray imaging technique for crystalline materials, providing high resolution maps of structure and strain. The technique is typically used to study a small isolated object, and is in general not compatible with a bulk polycrystalline sample, due to overlap of diffraction signals from various crystalline elements. In this paper, we present an imaging method for bulk samples, based on the use of a coherent source. The diffracted X-ray beam from a grain or domain of choice is magnified by an objective before being monitored by a 2D detector in the far field. The reconstruction principle is similar to the case of BCDI, while taking the magnification and pupil function into account. The concept is demonstrated using numerical simulations and reconstructions. We find that by using an object-lens distance shorter than the focal length, the numerical aperture is larger than in a traditional imaging geometry. and at the same time the setup is insensitive to small phase errors by lens imperfections. According to our simulations, we expect to be able to achieve a spatial resolution smaller than 20 nm when using the objective lens in this configuration. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

U2 - 10.1364/OE.26.023411

DO - 10.1364/OE.26.023411

M3 - Journal article

VL - 26

SP - 23411

EP - 23425

JO - Optics Express

JF - Optics Express

SN - 1094-4087

IS - 18

ER -