Efficient phase imaging using wavelength-resolved neutron Talbot-Lau interferometry with TOF method

¹ J-PARC Center, Japan Atomic Energy Agency - Tokai, Ibaraki 319-1195, Japan
² Comprehensive Research Organization for Science and Society (CROSS) - Tokai, Ibaraki 319-1106, Japan
³ Institute of Multidisciplinary Research for Advanced materials, Tohoku University - Sendai 980-8577, Japan
⁴ Center for Advanced Photonics, RIKEN - Wako, Saitama 351-0198, Japan
⁵ Graduate School of Engineering, Nagoya University - Nagoya 464-8603, Japan

Received: 4 April 2018
Accepted: 19 July 2018

Abstract

For efficient differential-phase-contrast imaging, we have demonstrated the wavelength-resolved neutron Talbot-Lau interferometry with the wavelength resolution of 0.11 Å over a wide wavelength range of 2.5–7.5 Å at RADEN in the J-PARC Materials and Life Science Experimental Facility. The time-of-flight measurement has clearly showed that the visibility of moiré fringes and intensity oscillations of the interferometer varied continuously with the wavelength, and the wavelength dependence of the differential phase of metal samples was measured. Based on the analysis utilizing this wavelength dependence, we achieved both high statistical precision and high accuracy in the differential-phase-contrast imaging, and succeeded in the quantitative evaluation of the optical potentials of metals.