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Holography-guided ptychography with soft X-rays

Hessing, Piet; Pfau, Bastian LU ; Guehrs, Erik; Schneider, Michael; Shemilt, Laura; Geilhufe, Jan and Eisebitt, Stefan LU (2016) In Optics Express 24(2). p.1840-1851
Abstract

Ptychography is a lensless imaging technique that aims to reconstruct an object from a set of coherent diffraction patterns originating from different and partially overlapping sample illumination areas. For a successful convergence of the iterative algorithms used, the sample scan positions have to be known with very high accuracy. Here, we present a method that allows to directly encode this information in the diffraction patterns without the need of accurate position encoders. Our approach relies on combining ptychography with another coherent imaging method, namely Fourier-transform holography. We have imaged two different objects using coherent soft-X-ray illumination and investigate the influence of experimental and numerical... (More)

Ptychography is a lensless imaging technique that aims to reconstruct an object from a set of coherent diffraction patterns originating from different and partially overlapping sample illumination areas. For a successful convergence of the iterative algorithms used, the sample scan positions have to be known with very high accuracy. Here, we present a method that allows to directly encode this information in the diffraction patterns without the need of accurate position encoders. Our approach relies on combining ptychography with another coherent imaging method, namely Fourier-transform holography. We have imaged two different objects using coherent soft-X-ray illumination and investigate the influence of experimental and numerical position refinement on the reconstruction result. We demonstrate that holographically encoded positions significantly reduce the experimental and numerical requirements. Our ptychographic reconstructions cover a large field of view with diffraction-limited resolution and high sensitivity in the reconstructed phase shift and absorption of the objects.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Optics Express
volume
24
issue
2
pages
12 pages
publisher
OSA
external identifiers
  • Scopus:84962302159
ISSN
1094-4087
DOI
10.1364/OE.24.001840
language
English
LU publication?
yes
id
cd89497f-17d8-4d9e-b962-5393762b6500
date added to LUP
2016-07-19 09:39:53
date last changed
2016-10-23 04:44:44
@misc{cd89497f-17d8-4d9e-b962-5393762b6500,
  abstract     = {<p>Ptychography is a lensless imaging technique that aims to reconstruct an object from a set of coherent diffraction patterns originating from different and partially overlapping sample illumination areas. For a successful convergence of the iterative algorithms used, the sample scan positions have to be known with very high accuracy. Here, we present a method that allows to directly encode this information in the diffraction patterns without the need of accurate position encoders. Our approach relies on combining ptychography with another coherent imaging method, namely Fourier-transform holography. We have imaged two different objects using coherent soft-X-ray illumination and investigate the influence of experimental and numerical position refinement on the reconstruction result. We demonstrate that holographically encoded positions significantly reduce the experimental and numerical requirements. Our ptychographic reconstructions cover a large field of view with diffraction-limited resolution and high sensitivity in the reconstructed phase shift and absorption of the objects.</p>},
  author       = {Hessing, Piet and Pfau, Bastian and Guehrs, Erik and Schneider, Michael and Shemilt, Laura and Geilhufe, Jan and Eisebitt, Stefan},
  issn         = {1094-4087},
  language     = {eng},
  month        = {01},
  number       = {2},
  pages        = {1840--1851},
  publisher    = {ARRAY(0x95f1a10)},
  series       = {Optics Express},
  title        = {Holography-guided ptychography with soft X-rays},
  url          = {http://dx.doi.org/10.1364/OE.24.001840},
  volume       = {24},
  year         = {2016},
}