Small-angle scattering interferometry with neutron orbital angular momentum states

Dusan Sarenac (), Melissa E. Henderson, Huseyin Ekinci, Charles W. Clark, David G. Cory, Lisa DeBeer-Schmitt, Michael G. Huber, Owen Lailey, Jonathan S. White, Kirill Zhernenkov and Dmitry A. Pushin ()
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Dusan Sarenac: State University of New York
Melissa E. Henderson: University of Waterloo
Huseyin Ekinci: University of Waterloo
Charles W. Clark: National Institute of Standards and Technology and University of Maryland
David G. Cory: University of Waterloo
Lisa DeBeer-Schmitt: Oak Ridge National Laboratory
Michael G. Huber: National Institute of Standards and Technology
Owen Lailey: University of Waterloo
Jonathan S. White: PSI Center for Neutron and Muon Sciences
Kirill Zhernenkov: Jülich Centre for Neutron Science at Heinz Maier-Leibnitz Zentrum
Dmitry A. Pushin: University of Waterloo

Nature Communications, 2024, vol. 15, issue 1, 1-6

Abstract: Abstract Methods to prepare and characterize neutron helical waves carrying orbital angular momentum (OAM) were recently demonstrated at small-angle neutron scattering (SANS) facilities. These methods enable access to the neutron orbital degree of freedom which provides new avenues of exploration in fundamental science experiments as well as in material characterization applications. However, it remains a challenge to recover phase profiles from SANS measurements. We introduce and demonstrate a novel neutron interferometry technique for extracting phase information that is typically lost in SANS measurements. An array of reference beams, with complementary structured phase profiles, are put into a coherent superposition with the array of object beams, thereby manifesting the phase information in the far-field intensity profile. We demonstrate this by resolving petal-structure signatures of helical wave interference for the first time: an implementation of the long-sought recovery of phase information from small-angle scattering measurements.

Date: 2024
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DOI: 10.1038/s41467-024-54991-8

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