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A coded aperture microscope for X-ray fluorescence full-field imaging.

Publication ,  Journal Article
Siddons, DP; Kuczewski, AJ; Rumaiz, AK; Tappero, R; Idir, M; Nakhoda, K; Khanfri, J; Singh, V; Farquhar, ER; Sullivan, M; Abel, D; Brady, DJ; Yuan, X
Published in: Journal of synchrotron radiation
November 2020

The design and construction of an instrument for full-field imaging of the X-ray fluorescence emitted by a fully illuminated sample are presented. The aim is to produce an X-ray microscope with a few micrometers spatial resolution, which does not need to scan the sample. Since the fluorescence from a spatially inhomogeneous sample may contain many fluorescence lines, the optic which will provide the magnification of the emissions must be achromatic, i.e. its optical properties must be energy-independent. The only optics which fulfill this requirement in the X-ray regime are mirrors and pinholes. The throughput of a simple pinhole is very low, so the concept of coded apertures is an attractive extension which improves the throughput by having many pinholes, and retains the achromatic property. Modified uniformly redundant arrays (MURAs) with 10 µm openings and 50% open area have been fabricated using gold in a lithographic technique, fabricated on a 1 µm-thick silicon nitride membrane. The gold is 25 µm thick, offering good contrast up to 20 keV. The silicon nitride is transparent down into the soft X-ray region. MURAs with various orders, from 19 up to 73, as well as their respective negative (a mask where open and closed positions are inversed compared with the original mask), have been made. Having both signs of mask will reduce near-field artifacts and make it possible to correct for any lack of contrast.

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Published In

Journal of synchrotron radiation

DOI

EISSN

1600-5775

ISSN

0909-0495

Publication Date

November 2020

Volume

27

Issue

Pt 6

Start / End Page

1703 / 1706

Related Subject Headings

  • Biophysics
  • 5104 Condensed matter physics
  • 5102 Atomic, molecular and optical physics
  • 3406 Physical chemistry
  • 0306 Physical Chemistry (incl. Structural)
  • 0205 Optical Physics
  • 0204 Condensed Matter Physics
 

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Siddons, D. P., Kuczewski, A. J., Rumaiz, A. K., Tappero, R., Idir, M., Nakhoda, K., … Yuan, X. (2020). A coded aperture microscope for X-ray fluorescence full-field imaging. Journal of Synchrotron Radiation, 27(Pt 6), 1703–1706. https://doi.org/10.1107/s1600577520012308
Siddons, D. P., A. J. Kuczewski, A. K. Rumaiz, R. Tappero, M. Idir, K. Nakhoda, J. Khanfri, et al. “A coded aperture microscope for X-ray fluorescence full-field imaging.Journal of Synchrotron Radiation 27, no. Pt 6 (November 2020): 1703–6. https://doi.org/10.1107/s1600577520012308.
Siddons DP, Kuczewski AJ, Rumaiz AK, Tappero R, Idir M, Nakhoda K, et al. A coded aperture microscope for X-ray fluorescence full-field imaging. Journal of synchrotron radiation. 2020 Nov;27(Pt 6):1703–6.
Siddons, D. P., et al. “A coded aperture microscope for X-ray fluorescence full-field imaging.Journal of Synchrotron Radiation, vol. 27, no. Pt 6, Nov. 2020, pp. 1703–06. Epmc, doi:10.1107/s1600577520012308.
Siddons DP, Kuczewski AJ, Rumaiz AK, Tappero R, Idir M, Nakhoda K, Khanfri J, Singh V, Farquhar ER, Sullivan M, Abel D, Brady DJ, Yuan X. A coded aperture microscope for X-ray fluorescence full-field imaging. Journal of synchrotron radiation. 2020 Nov;27(Pt 6):1703–1706.
Journal cover image

Published In

Journal of synchrotron radiation

DOI

EISSN

1600-5775

ISSN

0909-0495

Publication Date

November 2020

Volume

27

Issue

Pt 6

Start / End Page

1703 / 1706

Related Subject Headings

  • Biophysics
  • 5104 Condensed matter physics
  • 5102 Atomic, molecular and optical physics
  • 3406 Physical chemistry
  • 0306 Physical Chemistry (incl. Structural)
  • 0205 Optical Physics
  • 0204 Condensed Matter Physics